Please try latest mainline kernel in http://kernel.ubuntu.com/~kernel-
ppa/mainline/v4.15-rc6/
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https://bugs.launchpad.net/bugs/1597267
Title:
ThinkPad X260 connecting external
I have somewhat similar behavior on Lenovo T470p with external
displayport monitor connected via Thinkpad Ultra Dock on stock Ubuntu
17.04 (4.10.0-42-generic x86_64), but in my case it occurs after some
days of plugging in and ends with kernel panic (see screen photo).
** Attachment added:
Current xenial linux-image-4.4.0-62-generic remains broken, with dmesg
WARNs on CRTC clocks and then system hangs when switching user sessions
(which invokes some gnome-session xrandr setup). Lost the exact dmesg on
the system hang.
Current mainline 4.8.x (4.8.17-040817-generic) continues to
Tero Marttila, to keep this relevant to upstream, one would want to
periodically check for, and test the latest mainline kernel (now
4.10-rc1) as it is released.
Could you please advise?
** Changed in: linux (Ubuntu)
Status: Triaged => Incomplete
** Tags removed:
I've had good enough experiences with mainline 4.8.15 at this point that
I would consider this bug fixed in linux 4.8.x; it's still not perfect
(have to typically play around with xrandr and maybe undock/dock), but
external 4k DP monitor via a ThinkPad dock works fairly reliably now.
OTOH I was
I've been running the 4.8.x mainline release kernels recently, and had
some success with 4k DP connected to the dock. It doesn't always work,
but a reboot fixes it, until it breaks again.
I'd appreciate advice for debugging this, it's pretty reproducible, but
typically when it happens I don't
We just installed a fresh X260 for a new coworker.
Can confirm that kernel 4.8.0-040800rc5 works even without
https://github.com/linuxenko/ubuntu-skylake-i915-video-fix
We do still have problems with the Lenovo Pro and Ultra docks. We cannot get
4K@60Hz working using any videooutput on the
I've been having more luck with the newer 4.7 and 4.8 kernels, and using
a 4k monitor on the integrated DP connector mostly works okay at 60Hz.
Haven't really noticed any difference in stability with the
xorg.conf.d/20-intel.conf settings in https://github.com/linuxenko
Now I tried with the newest kernel 4.7.0-994-generic together with an
Xorg.conf.d fix from
https://github.com/linuxenko/ubuntu-skylake-i915-video-fix
It now works almost flawlessly over DP 4K 60hz.
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Tero Marttila, if you want your issue addressed as soon as possible, you
will want to create a net new report, indicating that you need the
commit(s) identified and backported to linux-stable so that it may be
included in Ubuntu.
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Hi first post here...
Just wanted to chime in and confirm same bug on same machine:
Thinkpad x260
Processor: Intel® Core™ i7-6500U CPU @ 2.50GHz × 4
Graphics: Gallium 0.4 on llvmpipe (LLVM 3.8, 256 bits)
In order to try and fix the bug I have added the repo:
I found a couple existing bugs in the freedesktop.org tracker that might
be related, all marked as fixed in recent nightlies:
https://bugs.freedesktop.org/show_bug.cgi?id=96714
https://bugs.freedesktop.org/show_bug.cgi?id=95498
https://bugs.freedesktop.org/show_bug.cgi?id=94822
Tero Marttila, the next step would be for upstream to identify and
submit the commit(s)that fixed your issue into linux-stable, where
Ubuntu pulls from. Hence, it would help speed this process up if you
filed a report following https://01.org/linuxgraphics/documentation/how-
report-bugs noting
** Tags removed: kernel-bug-exists-upstream-4.7-rc5
** Tags added: kernel-bug-exists-upstream-4.7-rc6
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https://bugs.launchpad.net/bugs/1597267
Title:
ThinkPad X260 connecting external
I can confirm that linux-image 4.7.0-994-generic_4.7.0-994.201607052202
from http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-
nightly/2016-07-06/ behaves much better.
DP hotplug/unplug behaves correctly across text console, VT switch to
lightdm and login into Unity. There's still some
Tero Marttila, to confirm this is reproducible upstream, could you
please test http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-
nightly/ and advise to the results?
** Tags added: kernel-bug-exists-upstream-4.7-rc5 latest-bios-1.21
** Changed in: linux (Ubuntu)
Status: Confirmed =>
And no upgrades or prior working versions, this is a fresh Ubuntu 16.04
install on a newly purchased X260 laptop.
** Description changed:
Running Ubuntu 16.04 on a Lenovo ThinkPad X260 with Intel Skylake HD
Graphics 520, connecting an external monitor to the DisplayPort
connector causes
As per the description, I have tested this with 4.4.0-28-generic as well
as mainline 4.6.3-040603-generic and 4.7.0-040700rc5-generic; they all
hang in a similar fashion.
In fact, the journal output I attached was from the 4.7 kernel, I
renamed the attachment accordingly:
Did this issue start happening after an update/upgrade? Was there a
prior kernel version where you were not having this particular problem?
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.7
Note that compared to #1559308 , connecting the same monitor via the
HDMI port on the laptop running 4.4.0-28-generic does seem to work fine:
There's still some stuff in dmesg when using HDMI as well:
snd_hda_codec_hdmi hdaudioC0D2: HDMI: ELD buf size is 0, force 128
snd_hda_codec_hdmi
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