[nouveau] Login screen seems to be crashing with multiple monitors (6720x1050 from 4x 1680x1050)

Bug #1836278 reported by Len Rose on 2019-07-12
This bug affects 1 person
Affects Status Importance Assigned to Milestone
gdm3 (Ubuntu)

Bug Description

Boot process halts at the point it normally runs gdm, it seems to keep re-trying. I learned that if I turn off the third and fourth monitor it will successfully run the desktop without crashing on the first two monitors. Once desktop (X) is fully operational, I can turn on third and fourth monitor and the workspace is initialized and I have (4) working monitors. I have never reported a bug before please excuse any faux pas. Best Regards, and wanted to say Thanks! for all the wonderful and amazing software.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gdm3 3.28.3-0ubuntu18.04.4
ProcVersionSignature: Ubuntu 4.15.0-54.58-generic 4.15.18
Uname: Linux 4.15.0-54-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu Jul 11 18:36:14 2019
InstallationDate: Installed on 2019-01-10 (182 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
 PATH=(custom, no user)
SourcePackage: gdm3
UpgradeStatus: No upgrade log present (probably fresh install)

Len Rose (terminus00) wrote :
Len Rose (terminus00) wrote :

I forgot to mention I downgraded gdm first to try and solve the issue but it did not change the problem. I intend to re-install latest again but wanted to file the report first.

Daniel van Vugt (vanvugt) wrote :

Please run these commands (with all monitors turned on):

lspci -k > lspcik.txt
xrandr > xrandr.txt
dpkg -l > allpackages.txt
journalctl -b0 > journal.txt

and then attach the resulting four text files to this bug.

Changed in gdm3 (Ubuntu):
status: New → Incomplete
Len Rose (terminus00) wrote :

Additional information attached as requested! Thanks


"it seems to keep re-trying" indeed suggests something is crashing, so to report a crash please follow these instructions:


The process that would be crashing even for the login screen is called 'gnome-shell'.

tags: added: nouveau
summary: - GDM seems to be crashing with multiple monitors
+ GDM seems to be crashing with multiple monitors (6720x1050 from 4x
+ 1680x1050)
Daniel van Vugt (vanvugt) wrote :

Finally, as a workaround please try uncommenting:


in /etc/gdm3/custom.conf, and then reboot.

summary: - GDM seems to be crashing with multiple monitors (6720x1050 from 4x
- 1680x1050)
+ [nouveau] Login screen seems to be crashing with multiple monitors
+ (6720x1050 from 4x 1680x1050)
Len Rose (terminus00) wrote :

The workaround is splendid! Both display cards and all 4-monitors are initializing at boot with the splash screen appearing early, all displays are functioning normally. Thank you very much! I have uploaded (2) crash files from 0835MDT when I rebooted today. One was for gnome-shell and one was for uXwayland. I am not sure why but there were no later crashes despite failing to bring up gdm as it booted. Thanks very much for the help.

Daniel van Vugt (vanvugt) wrote :

If your uploaded crash files resulted in new bugs being opened then please tell us the new bug IDs.

Otherwise, please do step 2 from comment #5:

Look at https://errors.ubuntu.com/user/ID where ID is the content of file /var/lib/whoopsie/whoopsie-id on the machine. Do you find any links to recent problems on that page? If so then please send the links to us.

Len Rose (terminus00) wrote :

Initially that whoopsie id wasn't registering using that system... However I tried it again and it is working now. https://errors.ubuntu.com/user/23a4afcb50334ac883e539750fe49827a6831f9da843f7672bdfc1335dd995623c3a68792f935aaa49ff49e39ac68d51baa34a223ecc292aa6c1293d302ebd8f shows a great deal of crash reports.

Daniel van Vugt (vanvugt) wrote :

Perfect, thanks.

I have turned your crash report into a new bug 1836290, so we will use that one now.

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