Comment 11 for bug 1972037

Sebastian,

Just turned off Xinerama (for a few minutes).
For some reason, the system is unable to use both screens without Xinerama.
Played with this a lot when I upgraded to 20.04 from 16.04 (worked nicely
before upgrade).
FWIW, cursor is a big X on second screen, but no background and no moving
windows onto it.

Stan

On Tue, May 10, 2022 at 11:52 AM Stan Tomlinson <email address hidden> wrote:

> Turned off COMPOSITE, and am getting the same reaction.
> See attached Xorg.0.log
>
> On Tue, May 10, 2022 at 3:20 AM Sebastien Bacher <
> <email address hidden>> wrote:
>
>> The Xorg log was sent via email and contains
>>
>> (WW) NVIDIA: The Composite and Xinerama extensions are both enabled, which
>> (WW) NVIDIA: is an unsupported configuration. The driver will
>> continue
>> (WW) NVIDIA: to load, but may behave strangely.
>> (WW) NVIDIA: Xinerama is enabled, so RandR has likely been disabled by the
>> (WW) NVIDIA: X server.
>>
>> gnome-control-center should handle the situation better but that's a bit
>> of a special graphical display configuration, did you try to do without
>> xinerama?
>>
>> --
>> You received this bug notification because you are subscribed to the bug
>> report.
>> https://bugs.launchpad.net/bugs/1972037
>>
>> Title:
>> Stack Overflow - gnome-control-center
>>
>> Status in gnome-control-center package in Ubuntu:
>> New
>>
>> Bug description:
>>
>> Program: gnome-control-center
>> Installed version: 1:3.36.5-0ubuntu4 (ubuntu default download)
>> OS: ubuntu 20.04.4 LTS
>> GNOME Version: 3.36.8 (ubuntu default download)
>> Windowing System: X11
>> Graphics: GeForce 8400GS/PCIe/SSE2
>> Driver: Using NVIDIA binary driver version 340.108
>> Source: download version from ubuntu
>>
>> Steps to reproduce:
>>
>> Reset GNOME settings with:
>> dconf reset -f /org/gnome/control-center/
>> Open GNOME Settings with:
>> /usr/bin/gnome-control-center
>> Click on "Displays" and receive:
>> Xlib: extension "RANDR" missing on display ":0".
>> Xlib: extension "RANDR" missing on display ":0".
>> Segmentation fault (core dumped)
>>
>> Repeated using gdb with package symbols.
>> Output of "bt -full" in attachment (with a few comments).
>>
>> (Submitted to gnome.org, but they said it is out of date and not
>> supported by them.)
>>
>> ProblemType: Bug
>> DistroRelease: Ubuntu 20.04
>> Package: gnome-control-center 1:3.36.5-0ubuntu4
>> ProcVersionSignature: Ubuntu 5.4.0-100.113-generic 5.4.166
>> Uname: Linux 5.4.0-100-generic x86_64
>> NonfreeKernelModules: nvidia
>> ApportVersion: 2.20.11-0ubuntu27.23
>> Architecture: amd64
>> CasperMD5CheckResult: skip
>> CurrentDesktop: GNOME-Flashback:GNOME
>> Date: Fri May 6 20:38:55 2022
>> InstallationDate: Installed on 2011-07-11 (3952 days ago)
>> InstallationMedia: Ubuntu-Server 11.04 "Natty Narwhal" - Release amd64
>> (20110426)
>> SourcePackage: gnome-control-center
>> UpgradeStatus: Upgraded to focal on 2022-02-01 (94 days ago)
>>
>> To manage notifications about this bug go to:
>>
>> https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1972037/+subscriptions
>>
>>