[Bug 1706474] Re: gdm3 nvidia modeset=1 is broken, external screens don't work on a Thinkpad p50

[David Coronel]

I just found out about this. I wanted to get rid of the screen tearing
that I observed on my Nitro AN515-53 laptop running Ubuntu 18.04.3 LTS
with NVIDIA GeForce GTX 1050 Mobile GPU.

I used https://askubuntu.com/a/020 and set nvidia_drm modeset=1 but
then my external monitors didn't work after the reboot. So I switched
from gdm3 to lightdm and that does the trick for me.

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[Bug 1706474] Re: gdm3 nvidia modeset=1 is broken, external screens don't work on a Thinkpad p50

[Tim Richardson]

I should add that the "fix" I reported is only a narrow fix. The
internal display works. But external displays don't work if you have
nvidia drivers, gdm3 and if you are using modeset=1

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[Bug 1706474] Re: gdm3 nvidia modeset=1 is broken, external screens don't work on a Thinkpad p50

[Daniel van Vugt]

Closed per comment #20. Discussion continues in bug 1714881...

** Changed in: gdm3 (Ubuntu)
   Status: New => Invalid

** Changed in: nvidia-graphics-drivers-375 (Ubuntu)
   Status: New => Invalid

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[Bug 1706474] Re: gdm3 nvidia modeset=1 is broken, external screens don't work on a Thinkpad p50

[Tim Richardson]

Daniel, with the latest 17.10 the nvidia problems are now more specific and 
easier to reproduce. 
Neither of my Thinkpads gets to the login screen in discrete Nvidia mode iff 
modeset=1 is used. 

In hybrid graphics, the session starts, I suspect this is due to the
intel driver being available. If I'm correct, then any machine with only
an nvidia card should fail with nvidia modesetting.

I have opened bug https://bugs.launchpad.net/ubuntu/+source/gnome-
shell/+bug/1714881

This bug (1706474) could be closed I think.

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[Bug 1706474] Re: gdm3 nvidia modeset=1 is broken, external screens don't work on a Thinkpad p50

[Daniel van Vugt]

** Summary changed:

- gdm3 nvidia modeset=1 is broken, external screens don't work
+ gdm3 nvidia modeset=1 is broken, external screens don't work on a Thinkpad p50

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Re: [Bug 1706474] Re: gdm3 nvidia modeset=1 is broken, external screens don't work

[Tim Richardson]

Good news from my side; I just updated everything on th ThinkPad W520, an
old Optimus laptop. the Uubntu 17.10 desktop now works with hybrid
graphics, prime sync and gdm3 using the latest updates (pre-release
channel). I have not added any PPAs so it's using the 375 driver currently
in the 17.10 repository.

On 28 August 2017 at 21:08, Tim Richardson 
wrote:

> Thanks Doug, that bug report is exactly as the nvidia forum so you and I
> are doing the same thing.
>
> On 28 August 2017 at 02:41, Doug McMahon <1706...@bugs.launchpad.net>
> wrote:
>
>> bug reports aren't suitable for troubleshooting but anyway I do as shown
>> here
>> https://ubuntuforums.org/showthread.php?t=2365449
>> noting that I've lenovo ideapads, no options to use discrete only so
>> using the typical optimus, i.e. intel handles display, nvidia handles
>> rendering, all via nvidia-prime, have no external monitors..
>>
>> --
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>>
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>
>
>
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Re: [Bug 1706474] Re: gdm3 nvidia modeset=1 is broken, external screens don't work

[Tim Richardson]

Thanks Doug, that bug report is exactly as the nvidia forum so you and I
are doing the same thing.

On 28 August 2017 at 02:41, Doug McMahon <1706...@bugs.launchpad.net>
wrote:

> bug reports aren't suitable for troubleshooting but anyway I do as shown
> here
> https://ubuntuforums.org/showthread.php?t=2365449
> noting that I've lenovo ideapads, no options to use discrete only so using
> the typical optimus, i.e. intel handles display, nvidia handles rendering,
> all via nvidia-prime, have no external monitors..
>
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>
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[Bug 1706474] Re: gdm3 nvidia modeset=1 is broken, external screens don't work

[Doug McMahon]

bug reports aren't suitable for troubleshooting but anyway I do as shown here
https://ubuntuforums.org/showthread.php?t=2365449
noting that I've lenovo ideapads, no options to use discrete only so using the 
typical optimus, i.e. intel handles display, nvidia handles rendering, all via 
nvidia-prime, have no external monitors..

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Re: [Bug 1706474] Re: gdm3 nvidia modeset=1 is broken, external screens don't work

[Tim Richardson]

HI Doug, it could be hardware dependent although my two Optimus laptops are
very mainstream (both Quadro). It's more likely to be configuration (I hope)
How do you achieve modeset=1?  How do you confirm that you have Prime Sync
working? I use xrandr --verbose | grep PRIME

regards

Tim



On 27 August 2017 at 00:19, Doug McMahon <1706...@bugs.launchpad.net> wrote:

> As far as hybrid (optimus) machines maybe this is hardware dependent?
> On all mine (660m, 775m, 940m) nvidia modeset=1 & Prime Synchronization
> work just fine, 16.04.3 thru 17.10.
> In 16.04.3 obviously using lightdm, in 17.10 using gdm3.
>
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[Bug 1706474] Re: gdm3 nvidia modeset=1 is broken, external screens don't work

[Doug McMahon]

As far as hybrid (optimus) machines maybe this is hardware dependent?
On all mine (660m, 775m, 940m) nvidia modeset=1 & Prime Synchronization work 
just fine, 16.04.3 thru 17.10.
In 16.04.3 obviously using lightdm, in 17.10 using gdm3.

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[Bug 1706474] Re: gdm3 nvidia modeset=1 is broken, external screens don't work

[Tim Richardson]

Sorry, that was premature. I had not enabled modeset=1 properly.
After doing that
a) in Optimus mode, only the laptop display works. The nvidia settings control 
panel opens, but it detects no screens.
b) in discrete nvidia BIOS mode, gdm is stuck in a greeter loop when trying to 
start a Gmome or Gnome classic session
c) in discrete Nvidia BIOS mode, Wayland is a session option, and it works. 

So this is still a bug: 17.10 Ubuntu is still broken for Optimus users
who want tear-free graphics.

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[Bug 1706474] Re: gdm3 nvidia modeset=1 is broken, external screens don't work

[Tim Richardson]

On the newer machine, the P50, I reinstalled 17.10 ubuntu yesterday,
with pre-release packages enabled. It is using gdm3. It works, even with
nvidia modeset=1 and external monitors. It is not obvious to me which
updated packages have fixed this, since I also tried pre-release on the
broken install. The conclusion is that I had something broken in my
configuration. I uninstalled X and the desktop environment a few times,
which didn't work. In pure Nvidia mode, not Optimus, I am offered a
Wayland session, which seems to work (I only did a few minutes of
testing).

My broken install was an upgrade from 17.04. When 17.10 goes beta, I
will install 17.04, fully update it, and test a migration to 17.10. If
this doesn't work, I will seek help to track down which configuration
settings could cause this.

It is certainly encouraging that it works from a reinstall.

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[Bug 1706474] Re: gdm3 nvidia modeset=1 is broken, external screens don't work

[Tim Richardson]

It is also broken on a ThinkPad W520, which is much older hardware
(although still supported by current nvidia drivers). The Nvidia driver,
gdm3, gnome (or gnome ubuntu) and modeset=1 is broken. Replace gdm3 with
lightdm, and everything works.

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[Bug 1706474] Re: gdm3 nvidia modeset=1 is broken, external screens don't work

[Tim Richardson]

And also note that modeset=1 is not designed to activate wayland. It is
necessary to use the Prime Synchonization feature of the new nvidia
drivers, which is actually a feature of X 1.19

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[Bug 1706474] Re: gdm3 nvidia modeset=1 is broken, external screens don't work

[Tim Richardson]

Update & simplication.
This bug affects 17.10 & 17.04 with the current LTS support nvidia drivers.
This bug affects both my laptops with nvidia hardware.
External monitors are not necessary to reproduce.

Reproduction is simple. 
1. Activate the nvidia hardware using discrete mode. Therefore no intel 
graphics hardware is present. 

2. Enable the nvidia driver in modeset=1

make a file /etc/modprobe.d/zz-nvidia-modeset.conf
with contents
options nvidia_384_drm modeset=1

3. sudo update-initramfs

4. make sure gdm3 is your display manager

5. reboot

6. attempt to start a gnome session

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Re: [Bug 1706474] Re: gdm3 nvidia modeset=1 is broken, external screens don't work

[Tim Richardson]

Thanks, I look forward to it. It works with lightdm, though. What is GDM
doing that leads to a kernel panic, that lightdm does not do?

On 31 July 2017 at 12:03, Daniel van Vugt 
wrote:

> Oh, it appears your "p50 with a quadro M1000M" is relatively new.
>
> I read that Canonical has a kernel fix on the way that *might* help, but
> that discussion is hidden in private bug 1647617. So if and when that
> fix gets released I will give updates here.
>
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[Bug 1706474] Re: gdm3 nvidia modeset=1 is broken, external screens don't work

[Daniel van Vugt]

Oh, it appears your "p50 with a quadro M1000M" is relatively new.

I read that Canonical has a kernel fix on the way that *might* help, but
that discussion is hidden in private bug 1647617. So if and when that
fix gets released I will give updates here.

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[Bug 1706474] Re: gdm3 nvidia modeset=1 is broken, external screens don't work

[Daniel van Vugt]

** This bug is no longer a duplicate of bug 1705369
   Ubuntu 17.10 boots to black screen when using Nvidia drivers (on a desktop 
with an Intel GPU)

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[Bug 1706474] Re: gdm3 nvidia modeset=1 is broken, external screens don't work

[Tim Richardson]

*** This bug is a duplicate of bug 1705369 ***
https://bugs.launchpad.net/bugs/1705369

** This bug has been marked a duplicate of bug 1705369
   Ubuntu 17.10 boots to black screen when using Nvidia drivers (on a desktop 
with an Intel GPU)

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Re: [Bug 1706474] Re: gdm3 nvidia modeset=1 is broken, external screens don't work

[Tim Richardson]

That;s even worse. I don't any working screen, no login.
This is not a trivial bug, I think, although I'd be happy for an easy
solution.


ul 26 17:26:38 raffles systemd[2817]: Starting Accessibility services bus...
Jul 26 17:26:38 raffles dbus-daemon[2832]: Successfully activated service
'org.a11y.Bus'
Jul 26 17:26:38 raffles systemd[2817]: Started Accessibility services bus.
Jul 26 17:26:38 raffles at-spi-bus-launcher[2843]: Activating service
name='org.a11y.atspi.Registry'
Jul 26 17:26:38 raffles at-spi-bus-launcher[2843]: Successfully activated
service 'org.a11y.atspi.Registry'
Jul 26 17:26:38 raffles org.a11y.atspi.Registry[2848]: SpiRegistry daemon
is running with well-known name - org.a11y.atspi.Registry
Jul 26 17:26:38 raffles gnome-session[2839]: gnome-session-binary[2839]:
WARNING: Application 'org.gnome.Shell.desktop' killed by signal 11
Jul 26 17:26:38 raffles gnome-session-binary[2839]: WARNING: Application
'org.gnome.Shell.desktop' killed by signal 11
Jul 26 17:26:38 raffles kernel: [   21.885358] show_signal_msg: 1 callbacks
suppressed
Jul 26 17:26:38 raffles kernel: [   21.885360] gnome-shell[2869]: segfault
at 28 ip 7f00f6c3ad74 sp 7ffef4304940 error 4 in
libmutter-0.so.0.0.0[7f00f6bf3000+131000]
Jul 26 17:26:39 raffles gnome-session[2839]: gnome-session-binary[2839]:
WARNING: Application 'org.gnome.Shell.desktop' killed by signal 11
Jul 26 17:26:39 raffles gnome-session[2839]: gnome-session-binary[2839]:
WARNING: App 'org.gnome.Shell.desktop' respawning too quickly
Jul 26 17:26:39 raffles gnome-session-binary[2839]: WARNING: Application
'org.gnome.Shell.desktop' killed by signal 11
Jul 26 17:26:39 raffles gnome-session-binary[2839]: Unrecoverable failure
in required component org.gnome.Shell.desktop
Jul 26 17:26:39 raffles gnome-session[2839]: gnome-session-binary[2839]:
CRITICAL: We failed, but the fail whale is dead. Sorry
Jul 26 17:26:39 raffles gnome-session-binary[2839]: WARNING: App
'org.gnome.Shell.desktop' respawning too quickly
Jul 26 17:26:39 raffles gnome-session-binary[2839]: CRITICAL: We failed,
but the fail whale is dead. Sorry
Jul 26 17:26:39 raffles org.a11y.atspi.Registry[2848]: XIO:  fatal IO error
11 (Resource temporarily unavailable) on X server ":0"
Jul 26 17:26:39 raffles org.a11y.atspi.Registry[2848]:   after 21
requests (21 known processed) with 0 events remaining.
Jul 26 17:26:39 raffles /usr/lib/gdm3/gdm-x-session[2822]: (**) Option "fd"
"33"
Jul 26 17:26:39 raffles /usr/lib/gdm3/gdm-x-session[2822]: (**) Option "fd"
"36"

On 26 July 2017 at 15:01, Daniel van Vugt 
wrote:

> If everything works fine with lightdm then you can configure gdm to
> behave the same as lightdm.
>
> Just edit /etc/gdm3/custom.conf and uncomment:  #WaylandEnable=false
>
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** Attachment added: "syslog"
   https://bugs.launchpad.net/bugs/1706474/+attachment/4921515/+files/syslog

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[Bug 1706474] Re: gdm3 nvidia modeset=1 is broken, external screens don't work

[Daniel van Vugt]

If everything works fine with lightdm then you can configure gdm to
behave the same as lightdm.

Just edit /etc/gdm3/custom.conf and uncomment:  #WaylandEnable=false

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Re: [Bug 1706474] Re: gdm3 nvidia modeset=1 is broken, external screens don't work

[Tim Richardson]

The problem is that Optimus (Nvidia's hybrid driver technology) requires
modeset=1 to use it properly so there are millions of laptop users who will
have a problem with this :)
https://devtalk.nvidia.com/default/topic/957814/linux/prime-and-prime-synchronization/

Plus it works fine with lightdm.


On 26 July 2017 at 13:58, Daniel van Vugt 
wrote:

> I suggest you should just avoid Wayland if you want multi-GPU to work
> properly. That means using modeset=0.
>
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[Bug 1706474] Re: gdm3 nvidia modeset=1 is broken, external screens don't work

[Daniel van Vugt]

I think it might be a general problem with Wayland (which is what gets
used if you set modeset=1):

https://bugs.freedesktop.org/show_bug.cgi?id=94851

So GDM/Wayland uses the first GPU only, which is your Intel GPU, the one
wired to the laptop screen.

** Bug watch added: freedesktop.org Bugzilla #94851
   https://bugs.freedesktop.org/show_bug.cgi?id=94851

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  gdm3 nvidia modeset=1 is broken, external screens don't work

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[Bug 1706474] Re: gdm3 nvidia modeset=1 is broken, external screens don't work

[Daniel van Vugt]

I suggest you should just avoid Wayland if you want multi-GPU to work
properly. That means using modeset=0.

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Title:
  gdm3 nvidia modeset=1 is broken, external screens don't work

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[Bug 1706474] Re: gdm3 nvidia modeset=1 is broken, external screens don't work

[Daniel van Vugt]

** Also affects: nvidia-graphics-drivers-375 (Ubuntu)
   Importance: Undecided
   Status: New

** Tags added: black-screen gnome-17.10 multimonitor nvidia

** Tags removed: gnome-17.10
** Tags added: zesty

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  gdm3 nvidia modeset=1 is broken, external screens don't work

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[Bug 1706474] Re: gdm3 nvidia modeset=1 is broken, external screens don't work

[Tim Richardson]

** Attachment added: "xrandr output"
   
https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1706474/+attachment/4921331/+files/xrandr.txt

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  gdm3 nvidia modeset=1 is broken, external screens don't work

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[Bug 1706474] Re: gdm3 nvidia modeset=1 is broken, external screens don't work

[Tim Richardson]

** Attachment added: "nvidia-bug-report"
   
https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1706474/+attachment/4921327/+files/nvidia-bug-report.log.gz

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  gdm3 nvidia modeset=1 is broken, external screens don't work

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