[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[muhkuh]

I have a laptop with an old Intel 945G Chipset. When upgrading from
14.04 to 16.04 Xorg already crashed on Startup before I was successfully
logged in (have auto-login enabled). Applying the Workaround from #40
worked. I get into the Desktop session and everything seems stable.

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Title:
  Intel driver crashes on Ubuntu 15.10

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Cormac]

I have also rolled back to SNA and haven't yet had a crash so 16.04
seems to have solved the issue.  I will probably have a crash now as
soon as I post this comment.

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Johan Tol]

The same for me. Today I rolled back the "uxa"-workaround by deleting
the 20-intel.conf file from /etc/X11/xorg.conf.d (I didn't have one
before the workaround). After a couple of hours I still haven't had a
single crash. I guess 16.04 solved the problem.

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  Intel driver crashes on Ubuntu 15.10

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[KaySL]

This no longer happens for me after doing a clean install of 16.04. I'm
running kernel version 4.4.0-18, with a Broadwell i5-5200U CPU.

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Re: [Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Pietro Callisto]

Thanks, trying it now.

Pietro Callisto

On 3 May 2016 at 01:56, Anders Olsson  wrote:

> I'm still experiencing this on 16.04. Switching to UXA acceleration
> fixes the problem. I'm on a Dell XPS 13 9350, with a Skylake i7-6500U
> CPU.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1510970
>
> Title:
>   Intel driver crashes on Ubuntu 15.10
>
> Status in xserver-xorg-video-intel package in Ubuntu:
>   Confirmed
>
> Bug description:
>   The Xserver crashes randomly after upgrading to Ubuntu 15.10. Before
>   the update everything was stable.
>
>   The problem occured mostly while using Thunderbird but also once while
>   using Firefox.
>
>   The Xserver crashes and I'm logged out. It takes about 10 seconds
>   until gdm fires up again and I'm able to login again.
>
>   The last part of /var/log/Xorg.0.log says:
>   [ 19778.602] (II) intel(0): resizing framebuffer to 3000x1920
>   [ 19778.617] (II) intel(0): switch to mode 1920x1080@60.0 on HDMI2
> using pipe 1, position (0, 0), rotation left, reflection none
>   [ 19778.623] (II) intel(0): switch to mode 1920x1080@60.0 on HDMI1
> using pipe 0, position (1080, 406), rotation normal, reflection none
>   [ 19798.610] (II) intel(0): switch to mode 1920x1080@60.0 on HDMI1
> using pipe 0, position (1080, 502), rotation normal, reflection none
>   [ 20012.432] (EE)
>   [ 20012.432] (EE) Backtrace:
>   [ 20012.433] (EE) 0: /usr/bin/X (xorg_backtrace+0x4e) [0x55cab7c8f62e]
>   [ 20012.433] (EE) 1: /usr/bin/X (0x55cab7adb000+0x1b8999)
> [0x55cab7c93999]
>   [ 20012.433] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6
> (0x7fe7c651d000+0x352f0) [0x7fe7c65522f0]
>   [ 20012.433] (EE) 3: /usr/lib/xorg/modules/drivers/intel_drv.so
> (0x7fe7c28f4000+0x24f18) [0x7fe7c2918f18]
>   [ 20012.433] (EE) 4: /usr/lib/xorg/modules/drivers/intel_drv.so
> (0x7fe7c28f4000+0x26157) [0x7fe7c291a157]
>   [ 20012.433] (EE) 5: /usr/lib/xorg/modules/drivers/intel_drv.so
> (0x7fe7c28f4000+0x2b4b1) [0x7fe7c291f4b1]
>   [ 20012.433] (EE) 6: /usr/lib/xorg/modules/drivers/intel_drv.so
> (0x7fe7c28f4000+0x804e4) [0x7fe7c29744e4]
>   [ 20012.433] (EE) 7: /usr/lib/xorg/modules/drivers/intel_drv.so
> (0x7fe7c28f4000+0x80e2c) [0x7fe7c2974e2c]
>   [ 20012.433] (EE) 8: /usr/lib/xorg/modules/drivers/intel_drv.so
> (0x7fe7c28f4000+0x82e1a) [0x7fe7c2976e1a]
>   [ 20012.433] (EE) 9: /usr/lib/xorg/modules/drivers/intel_drv.so
> (0x7fe7c28f4000+0x4197c) [0x7fe7c293597c]
>   [ 20012.433] (EE) 10: /usr/lib/xorg/modules/drivers/intel_drv.so
> (0x7fe7c28f4000+0x59906) [0x7fe7c294d906]
>   [ 20012.433] (EE) 11: /usr/bin/X (_CallCallbacks+0x34) [0x55cab7b38654]
>   [ 20012.433] (EE) 12: /usr/bin/X (WriteToClient+0x244) [0x55cab7c93274]
>   [ 20012.433] (EE) 13: /usr/bin/X (WriteEventsToClient+0x1e2)
> [0x55cab7b3e502]
>   [ 20012.433] (EE) 14: /usr/bin/X (0x55cab7adb000+0xf495a)
> [0x55cab7bcf95a]
>   [ 20012.433] (EE) 15: /usr/bin/X (0x55cab7adb000+0xf5ef5)
> [0x55cab7bd0ef5]
>   [ 20012.433] (EE) 16: /usr/bin/X (0x55cab7adb000+0x5818f)
> [0x55cab7b3318f]
>   [ 20012.433] (EE) 17: /usr/bin/X (0x55cab7adb000+0x5c34b)
> [0x55cab7b3734b]
>   [ 20012.433] (EE) 18: /lib/x86_64-linux-gnu/libc.so.6
> (__libc_start_main+0xf0) [0x7fe7c653da40]
>   [ 20012.433] (EE) 19: /usr/bin/X (_start+0x29) [0x55cab7b216c9]
>   [ 20012.433] (EE)
>   [ 20012.433] (EE) Segmentation fault at address 0x0
>   [ 20012.433] (EE)
>   Fatal server error:
>   [ 20012.433] (EE) Caught signal 11 (Segmentation fault). Server aborting
>   [ 20012.433] (EE)
>   [ 20012.433] (EE)
>   Please consult the The X.Org Foundation support
>at http://wiki.x.org
>for help.
>   [ 20012.433] (EE) Please also check the log file at
> "/var/log/Xorg.0.log" for additional information.
>   [ 20012.433] (EE)
>   [ 20012.433] (II) AIGLX: Suspending AIGLX clients for VT switch
>   [ 20012.456] (EE) Server terminated with error (1). Closing log file.
>
>   These parts of dmesg might be interesting:
>   [1.661760] input: Logitech USB Keyboard as
> /devices/pci:00/:00:1a.0/usb3/3-1/3-1.6/3-1.6:1.1/0003:046D:C31C.0003/input/input8
>   [1.714657] hid-generic 0003:046D:C31C.0003: input,hidraw2: USB HID
> v1.10 Device [Logitech USB Keyboard] on usb-:00:1a.0-1.6/input1
>   [2.530993] [drm:intel_set_pch_fifo_underrun_reporting [i915]]
> *ERROR* uncleared pch fifo underrun on pch transcoder A
>   [2.531006] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR*
> PCH transcoder A FIFO underrun
>   [2.531018] [drm:intel_set_pch_fifo_underrun_reporting [i915]]
> *ERROR* uncleared pch fifo underrun on pch transcoder B
>   [2.531026] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR*
> PCH transcoder B FIFO underrun
>   [2.561370] EXT4-fs (sda6): mounted filesystem with ordered data
> mode. Opts: (null)
>   [2.586624] clocksource: Switched to clocksource tsc
>   [2.652818] systemd[1]: Failed to insert module 

[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Anders Olsson]

I'm still experiencing this on 16.04. Switching to UXA acceleration
fixes the problem. I'm on a Dell XPS 13 9350, with a Skylake i7-6500U
CPU.

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Title:
  Intel driver crashes on Ubuntu 15.10

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Netibqa]

I had the same bug with 15.10. I used xubuntu, with awesome instead of
xfce. None of the solutions here worked.

When I had an external screen connected, the other screen would not
crash, and by going to arandr, unchecking then re-checking my main
screen would bring it back. When the screen is black, there are signs
that everything still behaves as if there was a working screen.

I reverted to 14.04 and all was fine, and now I upgraded to 16.04, and
am using xubuntu with xfce. The bug is back, and pretty frequent, but I
don't seem to see how to reproduce it (sometimes I'm just reading
something and it crashes). I disabled SNA again, maybe this time it will
work ?

I don't get how this is not a more urgent bug.

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  Intel driver crashes on Ubuntu 15.10

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Maarten Fonville]

What is the status for this bug for upcoming Xenial? Is it resolved or
is the workaround still necessary?

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  Intel driver crashes on Ubuntu 15.10

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[CB]

I have the same problem. My config:

Intel(R) Core(TM) i5-3470 CPU @ 3.20GHz
Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller
Ubuntu 14.04.4 LTS
Kernel 4.2.0-34-generic #39~14.04.1-Ubuntu

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Olivier Febwin]

Thank you Georgi for the workaround. Works for me!

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Sven]

On Gentoo, I'm using the intel driver _with_ SNA acceleration on a
Haswell system without issues. I'm using snapshot of the driver as
recent as February 24th.

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[kosiara]

#63 : 
My configuration is:
Intel® Core™ i5-3470 CPU @ 3.20GHz × 4 
Intel® Ivybridge Desktop 
Ubuntu 15.10 64-bit
4.4.2-040402-generic #201602171633

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[kosiara]

I created the file:
sudo touch /usr/share/X11/xorg.conf.d/20-intel.conf


sudo nano /usr/share/X11/xorg.conf.d/20-intel.conf
Then pasted the following content:

Section "Device"
 Identifier "Card0"
 Driver "Intel"
 Option "AccelMethod" "uxa"
EndSection


which resolved the random crash errors. 


cat /var/log/Xorg.0.log | grep -i sna

to check if SNA is enabled and working


Some time before that I disabled window animations but that only diminished the 
number of crashes.

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  Intel driver crashes on Ubuntu 15.10

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Michael Heuberger]

Can't find my 20-intel.conf anywhere on my machine - but I have the same
crashes. Hmmm ... how else can I disable SNA for my intel graphic card
for my Thinkpad laptop?

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  Intel driver crashes on Ubuntu 15.10

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Anoop Karollil]

You can create the file with contents described in comment #40. The
location of the file can be the one described in #40 or #42, or possibly
some place else depending on your version of Linux I guess.

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  Intel driver crashes on Ubuntu 15.10

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Dieter]

Same problems for weeks. Opening video files (vlan). Using Firefox. Opening or 
closing folders via SMB to an external NAS. 
And other activities which i do not remember, sorry.
First i would get the login screen again after 10-120 seconds. Then the crash 
report would tell me that it was xorg.

It might not be the same bug then please ignore my ranting.

But the last few days (since around xmas) the system would not do that anymore 
but simply freeze. Only hard reset helps even after waiting 15 minutes. I 
always install updates immediately.
Using Lenovo X220 with 15.10.
Will now try disabling SNA and see how it goes.

Bad bug! Was in the middle of important work that actually pays my
bills.

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[KaySL]

After a few days of this, added the xorg-edgers PPA, upgraded to the
newer packages, and I haven't had a single X server crash since. I also
installed the 4.4.0-040400rc4-generic kernel available here:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4-rc4-wily/ but I'm not
sure if that's required in addition to Edgers.

Disappointing that this bug remains unfixed.

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  Intel driver crashes on Ubuntu 15.10

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Felix]

The "uxa" #52 workaround helped me with starting games from steam again.

Maybe this helps with reproducing the bug: Constant crashes ocurred
while starting the game "screencheat" on Ubuntu 15.10, amd64.

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  Intel driver crashes on Ubuntu 15.10

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Timo Aaltonen]

Axel: note that 2015Q3 intel stack actually reverts to the old -intel
release (2.99.917) which has it's own set of bugs.

Someone willing to bisect between the wily -intel driver and xenial
version would be nice.

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  Intel driver crashes on Ubuntu 15.10

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[ubuntuuser]

Anyone looking for a solution to the bug?

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  Intel driver crashes on Ubuntu 15.10

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Mark Nitters]

On my system /usr/share/X11/xorg:conf:d/20-intel.conf did not exist.
Creating it with the following content solved the crashes:

me@host:/usr/share/X11/xorg.conf.d# cat 20-intel.conf 
Section "Device"
 Identifier "Card0"
 Driver "Intel"
 Option "AccelMethod" "uxa"
EndSection

Crashes were consistently reproducible when de-maximizing libreoffice
writer

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  Intel driver crashes on Ubuntu 15.10

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Axel G. Rossberg]

Had the same problem, in particular reproducible crashes when de-
maximizing libreoffice writer. Disabling SNA as suggested  by Mark
Nitters above fixed it, but also instead installation of intel's latest
drivers from here https://01.org/linuxgraphics/downloads/intel-graphics-
installer-linux-1.2.1 This will then use SNA graphics acceleration.

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Johan Tol]

Thank you Axel for pointing to the intel drivers. I installed the latest
drivers and enabled SNA again. It looks as if it takes longer to crash
now, but eventually it does. Prior to the update it was easy for me the
reproduce a crash with LibreOffice Calc. That requires a bit more effort
now. I guess I have to go back to uxa again.

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Sven]

Disabled SNA like suggested in comment #40 and that fixed the problem
for me. This was serious for me, as playing a video in VLC (and maybe
moving the window or seeking in the video) would crash X within a few
seconds.

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Raoul Bhatia]

I have had no crashes since a couple of days (however, of little usage).

SNA is still active:
$ cat /var/log/Xorg.0.log | grep SNA --color
[11.933] (II) intel(0): SNA compiled: xserver-xorg-video-intel 
2:2.99.917+git20150808-0ubuntu4 (Robert Ancell )
[11.933] (II) intel(0): SNA compiled for use with valgrind
[11.973] (II) intel(0): SNA initialized with Ivybridge (gen7, gt2) backend

Kernel:
$ uname -a
Linux raobhati.cisco.com 4.2.0-19-generic #23-Ubuntu SMP Wed Nov 11 11:39:30 
UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Hein]

In can also coonfirm that disabling SNA seems to work so far. It was
very easy to let my system crash before. Just open Libreoffice a few
times and resize the windowsize by clicking on the title bar.

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Cormac]

I can also confirm that disabling sna worked.

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Robert Hrovat]

Georgi thanks! No crashes so far. Even with compiz animations turned
back on.

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Davernos]

Disabling sna worked like a charm!

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Jay Hennessey]

FYI - I and others I know have hit this crash on at least 4 different
machines using intel graphics after upgrading to 15.10.

Please let me know if there's something I can do to assist in tracking
down the bug.

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Юрий Чудновский]

Confirm disabling SNA as a suitable workaround, no crashes since adding
'Option "AccelMethod" "uxa"'. Thanks to Georgi Ivanov and Anoop
Karollil!

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Johan Tol]

Thank you Georgi for the workaround. Works for me!

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Anoop Karollil]

Dejavu - I have done this before - disabling sna. I will give it a go,
thanks. I had two crashes yesterday.

Linux akarollil-desktop 4.2.0-16-generic #19-Ubuntu SMP Thu Oct 8
15:35:06 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Anoop Karollil]

Seems to be working, for people running Ubuntu 15.10, the location of
the file (20-intel.conf) with the contents that Georgi mentions above is
/usr/share/X11/xorg.conf.d (rather than /etc/X11).

You can check if SNA is enabled by:

cat /var/log/Xorg.0.log | grep SNA

If you see it in the log, reboot after creating 20-intel.conf file as
described above and you shouldn't. And hopefully the crashes will go
away. Initial testing seems to indicate it fixes it for me.

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Georgi Ivanov]

This seems to solve the problem for now

/etc/X11/xorg.conf.d/20-intel.conf

Section "Device"
 Identifier "Card0"
 Driver "Intel"
 Option "AccelMethod" "uxa"
EndSection

So disable sna...

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[SlavikZ]

I could just confirm that on kernel 4.3.0-040300 crashes are still
happen.

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Davernos]

Crashes using kernel 4.3 too.

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[dopez]

I also upgraded to kernel 4.3 and added xorg-edgers but I still get
crashes randomly

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Johannes Merkert]

I updated the kernel to 4.3 today but still got two crashes since then.

I also created /etc/mkinitcpio.conf and put "i915" in the file but that
did not change anything.

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Robert Hrovat]

I installed Gnome Flashback session, login with metacity (no compiz) and
it does not crash anymore. It's just a workaround but it might be better
than reinstalling with older version just because of this show stopper.

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[SlavikZ]

In may case disabling animations just decrease number of crashes from
couple crashes per day to couple crashes per week.

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[aldebx]

Devs, please check if this bug is the same as  Bug #1501088 Bug #1501468
Bug #1502397 Bug #1503991 Bug #1504102 Bug #1504806 Bug #1504998 Bug
#1505400 Bug #1505755 Bug #1505920 Bug #1506134 bug #1506321 Bug
#1506346 Bug #1506650 Bug #1507059 Bug #1507202 Bug #1507343 Bug
#1507569 Bug #1507659 bug #1509355 bug #1509622 Bug #1509644 Bug
#1509846 bug #1509846 bug #1510998 bug #1511145 bug #1511343 bug
#1511476 bug #1511512 bug #1511615 bug #1511704 Bug #1511819 Bug
#1511898 Bug #1512097 Bug #1512365

They all show common patterns such as:
- Intel graphic cards
- Ubuntu 15.10
- Unity desktop environment
- Xorg crashes while opening applications windows or menus such as in 
thunderbird/libreoffice/etc.

>From my findings, a temporary workaround to prevent X from crashing
while opening windows/menus is to disable window animations in Compiz.
Use compizconfig-settings-manager for this tweak (sudo apt-get install
compizconfig-settings-manager). You can also use desktop environments
such as XFCE and LXDE which do not use compiz.

After upgrading to kernel 4.3 I didn't run into this issue for several (5) days.
Kernels can be downloaded from http://kernel.ubuntu.com/~kernel-ppa/mainline/

Please join me in testing is this bug has been fixed upstream.

My current kernel:
Linux 4.3.0-040300rc7-generic #201510260712 SMP Mon Oct 26 11:14:07 UTC 2015 
x86_64 x86_64 x86_64 GNU/Linux

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[aldebx]

@slavikz, could you please try using kernel 4.3? In my case I didn't run
into this issue any more ever since I upgraded several days ago.
Upcoming kernels can be downloaded from http://kernel.ubuntu.com
/~kernel-ppa/mainline/

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Re: [Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Marcin Miszczuk]

Hello; i have had the same issues on others DE like Manjaro, Mageia and Linux 
Mint. Now, i'm trying Antergos (Arch distro with Gnome default); crashes 
continue;i've found this site 
https://wiki.archlinux.org/index.php/Intel_graphics and i did this: to enable 
KMS during the initramfs stage. To do this, add the i915 module to the MODULES 
line in /etc/mkinitcpio.conf. And i've changed  LDM  for GDM. For now, since 
few days, crashes stopped. 
Cheers;
 


 Le Mardi 3 novembre 2015 14h14, SlavikZ  a écrit :
   

 In may case disabling animations just decrease number of crashes from
couple crashes per day to couple crashes per week.

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Title:
  Intel driver crashes on Ubuntu 15.10

Status in xserver-xorg-video-intel package in Ubuntu:
  Confirmed

Bug description:
  The Xserver crashes randomly after upgrading to Ubuntu 15.10. Before
  the update everything was stable.

  The problem occured mostly while using Thunderbird but also once while
  using Firefox.

  The Xserver crashes and I'm logged out. It takes about 10 seconds
  until gdm fires up again and I'm able to login again.

  The last part of /var/log/Xorg.0.log says:
  [ 19778.602] (II) intel(0): resizing framebuffer to 3000x1920
  [ 19778.617] (II) intel(0): switch to mode 1920x1080@60.0 on HDMI2 using pipe 
1, position (0, 0), rotation left, reflection none
  [ 19778.623] (II) intel(0): switch to mode 1920x1080@60.0 on HDMI1 using pipe 
0, position (1080, 406), rotation normal, reflection none
  [ 19798.610] (II) intel(0): switch to mode 1920x1080@60.0 on HDMI1 using pipe 
0, position (1080, 502), rotation normal, reflection none
  [ 20012.432] (EE) 
  [ 20012.432] (EE) Backtrace:
  [ 20012.433] (EE) 0: /usr/bin/X (xorg_backtrace+0x4e) [0x55cab7c8f62e]
  [ 20012.433] (EE) 1: /usr/bin/X (0x55cab7adb000+0x1b8999) [0x55cab7c93999]
  [ 20012.433] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7fe7c651d000+0x352f0) 
[0x7fe7c65522f0]
  [ 20012.433] (EE) 3: /usr/lib/xorg/modules/drivers/intel_drv.so 
(0x7fe7c28f4000+0x24f18) [0x7fe7c2918f18]
  [ 20012.433] (EE) 4: /usr/lib/xorg/modules/drivers/intel_drv.so 
(0x7fe7c28f4000+0x26157) [0x7fe7c291a157]
  [ 20012.433] (EE) 5: /usr/lib/xorg/modules/drivers/intel_drv.so 
(0x7fe7c28f4000+0x2b4b1) [0x7fe7c291f4b1]
  [ 20012.433] (EE) 6: /usr/lib/xorg/modules/drivers/intel_drv.so 
(0x7fe7c28f4000+0x804e4) [0x7fe7c29744e4]
  [ 20012.433] (EE) 7: /usr/lib/xorg/modules/drivers/intel_drv.so 
(0x7fe7c28f4000+0x80e2c) [0x7fe7c2974e2c]
  [ 20012.433] (EE) 8: /usr/lib/xorg/modules/drivers/intel_drv.so 
(0x7fe7c28f4000+0x82e1a) [0x7fe7c2976e1a]
  [ 20012.433] (EE) 9: /usr/lib/xorg/modules/drivers/intel_drv.so 
(0x7fe7c28f4000+0x4197c) [0x7fe7c293597c]
  [ 20012.433] (EE) 10: /usr/lib/xorg/modules/drivers/intel_drv.so 
(0x7fe7c28f4000+0x59906) [0x7fe7c294d906]
  [ 20012.433] (EE) 11: /usr/bin/X (_CallCallbacks+0x34) [0x55cab7b38654]
  [ 20012.433] (EE) 12: /usr/bin/X (WriteToClient+0x244) [0x55cab7c93274]
  [ 20012.433] (EE) 13: /usr/bin/X (WriteEventsToClient+0x1e2) [0x55cab7b3e502]
  [ 20012.433] (EE) 14: /usr/bin/X (0x55cab7adb000+0xf495a) [0x55cab7bcf95a]
  [ 20012.433] (EE) 15: /usr/bin/X (0x55cab7adb000+0xf5ef5) [0x55cab7bd0ef5]
  [ 20012.433] (EE) 16: /usr/bin/X (0x55cab7adb000+0x5818f) [0x55cab7b3318f]
  [ 20012.433] (EE) 17: /usr/bin/X (0x55cab7adb000+0x5c34b) [0x55cab7b3734b]
  [ 20012.433] (EE) 18: /lib/x86_64-linux-gnu/libc.so.6 
(__libc_start_main+0xf0) [0x7fe7c653da40]
  [ 20012.433] (EE) 19: /usr/bin/X (_start+0x29) [0x55cab7b216c9]
  [ 20012.433] (EE) 
  [ 20012.433] (EE) Segmentation fault at address 0x0
  [ 20012.433] (EE) 
  Fatal server error:
  [ 20012.433] (EE) Caught signal 11 (Segmentation fault). Server aborting
  [ 20012.433] (EE) 
  [ 20012.433] (EE) 
  Please consult the The X.Org Foundation support 
          at http://wiki.x.org
  for help. 
  [ 20012.433] (EE) Please also check the log file at "/var/log/Xorg.0.log" for 
additional information.
  [ 20012.433] (EE) 
  [ 20012.433] (II) AIGLX: Suspending AIGLX clients for VT switch
  [ 20012.456] (EE) Server terminated with error (1). Closing log file.

  These parts of dmesg might be interesting:
  [    1.661760] input: Logitech USB Keyboard as 
/devices/pci:00/:00:1a.0/usb3/3-1/3-1.6/3-1.6:1.1/0003:046D:C31C.0003/input/input8
  [    1.714657] hid-generic 0003:046D:C31C.0003: input,hidraw2: USB HID v1.10 
Device [Logitech USB Keyboard] on usb-:00:1a.0-1.6/input1
  [    2.530993] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* 
uncleared pch fifo underrun on pch transcoder A
  [    2.531006] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH 
transcoder A FIFO underrun
  [    2.531018] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* 
uncleared pch fifo underrun on pch transcoder B
  [    2.531026] [drm:intel_pch_fifo_underrun_irq_handler 

[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Johannes Merkert]

Today I had a scenario where I could reproduce the Bug: I opened
LibreOffice Writer and inserted areas into the document. The first one
always worked but when I created the second area the X-server crashed.

I also noticed that apport took longer with each crash. After the third
crash I always killed apport because it prevented me for more than 30s
to log in again.

Could you give some update on the status of this bug? Is somebody from Intel 
working on this? 
I have to downgrade to an older Ubuntu version if this bug can't be fixed soon.

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Title:
  Intel driver crashes on Ubuntu 15.10

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Robert Hrovat]

Disabling animations did not help me. There are less crashes but still
happens. Almost everytime when I try to reply to a mail or open calendar
event in Thunderbird. This is not happening on other machines with non-
intel graphic cards.

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Title:
  Intel driver crashes on Ubuntu 15.10

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Anoop Karollil]

I can reproduce this consistently by opening up a calendar event in
Thunderbird. I also could reproduce this consistently when I opened up a
chat log dialog in Pidgin - but I could work around it by disabling
animations via CompizConfigSettingsManager. @Johannes, you could try
that work around, but yes, please fix this. I think booting into a
different kernel fixes the problem, but I have things installed that
depend on the latest kernel.

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Title:
  Intel driver crashes on Ubuntu 15.10

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: xserver-xorg-video-intel (Ubuntu)
   Status: New => Confirmed

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Title:
  Intel driver crashes on Ubuntu 15.10

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Christopher M. Penalver]

Johannes Merkert, thank you for reporting this and helping make Ubuntu
better.

Could you please run the following command from a terminal as it will 
automatically gather and attach updated debug information to this report:
apport-collect -p xorg 1510970

Please ensure you have the package xdiagnose installed, and that you
click the Yes button for attaching additional debugging information.

When reporting xorg related bugs in the future, please do so via the
above method. You can learn more about this functionality at
https://wiki.ubuntu.com/ReportingBugs.

** This bug is no longer a duplicate of bug 1509846
   lightdm crashes on window open in Ubuntu 15.10 intel

** Package changed: xserver-xorg-video-intel (Ubuntu) => xorg (Ubuntu)

** Changed in: xorg (Ubuntu)
   Importance: Undecided => Low

** Changed in: xorg (Ubuntu)
   Status: Confirmed => Incomplete

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Title:
  Intel driver crashes on Ubuntu 15.10

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Johannes Merkert]

apport information

** Tags added: apport-collected compiz-0.9 ubuntu wily

** Description changed:

  The Xserver crashes randomly after upgrading to Ubuntu 15.10. Before the
  update everything was stable.
  
  The problem occured mostly while using Thunderbird but also once while
  using Firefox.
  
  The Xserver crashes and I'm logged out. It takes about 10 seconds until
  gdm fires up again and I'm able to login again.
  
  The last part of /var/log/Xorg.0.log says:
  [ 19778.602] (II) intel(0): resizing framebuffer to 3000x1920
  [ 19778.617] (II) intel(0): switch to mode 1920x1080@60.0 on HDMI2 using pipe 
1, position (0, 0), rotation left, reflection none
  [ 19778.623] (II) intel(0): switch to mode 1920x1080@60.0 on HDMI1 using pipe 
0, position (1080, 406), rotation normal, reflection none
  [ 19798.610] (II) intel(0): switch to mode 1920x1080@60.0 on HDMI1 using pipe 
0, position (1080, 502), rotation normal, reflection none
  [ 20012.432] (EE) 
  [ 20012.432] (EE) Backtrace:
  [ 20012.433] (EE) 0: /usr/bin/X (xorg_backtrace+0x4e) [0x55cab7c8f62e]
  [ 20012.433] (EE) 1: /usr/bin/X (0x55cab7adb000+0x1b8999) [0x55cab7c93999]
  [ 20012.433] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7fe7c651d000+0x352f0) 
[0x7fe7c65522f0]
  [ 20012.433] (EE) 3: /usr/lib/xorg/modules/drivers/intel_drv.so 
(0x7fe7c28f4000+0x24f18) [0x7fe7c2918f18]
  [ 20012.433] (EE) 4: /usr/lib/xorg/modules/drivers/intel_drv.so 
(0x7fe7c28f4000+0x26157) [0x7fe7c291a157]
  [ 20012.433] (EE) 5: /usr/lib/xorg/modules/drivers/intel_drv.so 
(0x7fe7c28f4000+0x2b4b1) [0x7fe7c291f4b1]
  [ 20012.433] (EE) 6: /usr/lib/xorg/modules/drivers/intel_drv.so 
(0x7fe7c28f4000+0x804e4) [0x7fe7c29744e4]
  [ 20012.433] (EE) 7: /usr/lib/xorg/modules/drivers/intel_drv.so 
(0x7fe7c28f4000+0x80e2c) [0x7fe7c2974e2c]
  [ 20012.433] (EE) 8: /usr/lib/xorg/modules/drivers/intel_drv.so 
(0x7fe7c28f4000+0x82e1a) [0x7fe7c2976e1a]
  [ 20012.433] (EE) 9: /usr/lib/xorg/modules/drivers/intel_drv.so 
(0x7fe7c28f4000+0x4197c) [0x7fe7c293597c]
  [ 20012.433] (EE) 10: /usr/lib/xorg/modules/drivers/intel_drv.so 
(0x7fe7c28f4000+0x59906) [0x7fe7c294d906]
  [ 20012.433] (EE) 11: /usr/bin/X (_CallCallbacks+0x34) [0x55cab7b38654]
  [ 20012.433] (EE) 12: /usr/bin/X (WriteToClient+0x244) [0x55cab7c93274]
  [ 20012.433] (EE) 13: /usr/bin/X (WriteEventsToClient+0x1e2) [0x55cab7b3e502]
  [ 20012.433] (EE) 14: /usr/bin/X (0x55cab7adb000+0xf495a) [0x55cab7bcf95a]
  [ 20012.433] (EE) 15: /usr/bin/X (0x55cab7adb000+0xf5ef5) [0x55cab7bd0ef5]
  [ 20012.433] (EE) 16: /usr/bin/X (0x55cab7adb000+0x5818f) [0x55cab7b3318f]
  [ 20012.433] (EE) 17: /usr/bin/X (0x55cab7adb000+0x5c34b) [0x55cab7b3734b]
  [ 20012.433] (EE) 18: /lib/x86_64-linux-gnu/libc.so.6 
(__libc_start_main+0xf0) [0x7fe7c653da40]
  [ 20012.433] (EE) 19: /usr/bin/X (_start+0x29) [0x55cab7b216c9]
  [ 20012.433] (EE) 
  [ 20012.433] (EE) Segmentation fault at address 0x0
  [ 20012.433] (EE) 
  Fatal server error:
  [ 20012.433] (EE) Caught signal 11 (Segmentation fault). Server aborting
  [ 20012.433] (EE) 
  [ 20012.433] (EE) 
  Please consult the The X.Org Foundation support 
   at http://wiki.x.org
   for help. 
  [ 20012.433] (EE) Please also check the log file at "/var/log/Xorg.0.log" for 
additional information.
  [ 20012.433] (EE) 
  [ 20012.433] (II) AIGLX: Suspending AIGLX clients for VT switch
  [ 20012.456] (EE) Server terminated with error (1). Closing log file.
  
  These parts of dmesg might be interesting:
  [1.661760] input: Logitech USB Keyboard as 
/devices/pci:00/:00:1a.0/usb3/3-1/3-1.6/3-1.6:1.1/0003:046D:C31C.0003/input/input8
  [1.714657] hid-generic 0003:046D:C31C.0003: input,hidraw2: USB HID v1.10 
Device [Logitech USB Keyboard] on usb-:00:1a.0-1.6/input1
  [2.530993] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* 
uncleared pch fifo underrun on pch transcoder A
  [2.531006] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH 
transcoder A FIFO underrun
  [2.531018] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* 
uncleared pch fifo underrun on pch transcoder B
  [2.531026] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH 
transcoder B FIFO underrun
  [2.561370] EXT4-fs (sda6): mounted filesystem with ordered data mode. 
Opts: (null)
  [2.586624] clocksource: Switched to clocksource tsc
  [2.652818] systemd[1]: Failed to insert module 'kdbus': Function not 
implemented
  [2.658814] systemd[1]: systemd 225 running in system mode. (+PAM +AUDIT 
+SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS 
+ACL +XZ -LZ4 +SECCOMP +BLKID -ELFUTILS +KMOD -IDN)
  [2.658922] systemd[1]: Detected architecture x86-64.
  
  [  626.810377] audit_printk_skb: 45 callbacks suppressed
  [  626.810379] audit: type=1400 audit(1446023055.661:26): apparmor="STATUS" 
operation="profile_replace" profile="unconfined" name="/usr/sbin/ntpd" pid=7632 
comm="apparmor_parser"
  [ 1472.735741] perf interrupt 

[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Christopher M. Penalver]

** Tags added: bios-outdated-f.15

** Tags removed: bios-outdated-f.15
** Tags added: latest-bios-f.15

** Package changed: xorg (Ubuntu) => xserver-xorg-video-intel (Ubuntu)

** Changed in: xserver-xorg-video-intel (Ubuntu)
   Importance: Low => Medium

** Changed in: xserver-xorg-video-intel (Ubuntu)
   Status: Incomplete => New

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Title:
  Intel driver crashes on Ubuntu 15.10

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Launchpad Bug Tracker]

*** This bug is a duplicate of bug 1509846 ***
https://bugs.launchpad.net/bugs/1509846

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: xserver-xorg-video-intel (Ubuntu)
   Status: New => Confirmed

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Title:
  Intel driver crashes on Ubuntu 15.10

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[Timo Aaltonen]

** Package changed: xorg-server (Ubuntu) => xserver-xorg-video-intel
(Ubuntu)

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Title:
  Intel driver crashes on Ubuntu 15.10

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[Ubuntu-x-swat] [Bug 1510970] Re: Intel driver crashes on Ubuntu 15.10

[aldebx]

*** This bug is a duplicate of bug 1509846 ***
https://bugs.launchpad.net/bugs/1509846

** This bug has been marked a duplicate of bug 1509846
   lightdm crashes on window open in Ubuntu 15.10 intel

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Title:
  Intel driver crashes on Ubuntu 15.10

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