Unwanted desktop panning when using two displays

[Bart Schuurmans]

I use two displays. One has a resolution of 3840x2160, and another one is to the right of that with a resolution of 1080x1920 in "Portrait Left" mode. I use "Join Displays" in Settings > Displays.

When I configure this setup using Settings > Displays, my main desktop ends up being too big, extending to the secondary monitor to the right. When I move my mouse to the right edge of the secondary screen, the desktop pans.

When I arrange the secondary monitor to the left of my main display, this bug does not occur.

Secondary monitor on the right (bug):

minnozz@lux:~$ xrandr
Screen 0: minimum 8 x 8, current 5760 x 2160, maximum 32767 x 32767
DVI-D-0 disconnected (normal left inverted right x axis y axis)
HDMI-0 connected 1080x1920+3840+0 right (normal left inverted right x axis y axis) 527mm x 296mm panning 1920x1920+3840+0 tracking 5760x2160+0+0 border 0/0/0/0
   1920x1080 60.00*+ 59.94 50.00
   1600x1200 60.00
   1600x900 60.00
   1280x1024 75.02 60.02
   1280x720 60.00 59.94 50.00
   1152x864 75.00
   1024x768 75.03 60.00
   800x600 75.00 60.32
   720x576 50.00
   720x480 59.94
   640x480 75.00 59.94 59.93
DP-0 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 708mm x 399mm panning 4680x2160+0+0 tracking 5760x2160+0+0 border 0/0/0/0
   3840x2160 60.00*+ 29.98 24.00
   1024x768 60.00
   800x600 60.32
   640x480 59.94
DP-1 disconnected (normal left inverted right x axis y axis)

Secondary monitor on the left (no bug):

minnozz@lux:~$ xrandr
Screen 0: minimum 8 x 8, current 4920 x 2160, maximum 32767 x 32767
DVI-D-0 disconnected (normal left inverted right x axis y axis)
HDMI-0 connected 1080x1920+0+0 right (normal left inverted right x axis y axis) 527mm x 296mm
   1920x1080 60.00*+ 59.94 50.00
   1600x1200 60.00
   1600x900 60.00
   1280x1024 75.02 60.02
   1280x720 60.00 59.94 50.00
   1152x864 75.00
   1024x768 75.03 60.00
   800x600 75.00 60.32
   720x576 50.00
   720x480 59.94
   640x480 75.00 59.94 59.93
DP-0 connected primary 3840x2160+1080+0 (normal left inverted right x axis y axis) 708mm x 399mm
   3840x2160 60.00*+ 29.98 24.00
   1024x768 60.00
   800x600 60.32
   640x480 59.94
DP-1 disconnected (normal left inverted right x axis y axis)

The only difference between these two situations is that I dragged the monitor from the right to the left in Settings > Displays.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30
Uname: Linux 5.4.0-29-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
.proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0000:01:00.0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.suspend: suspend hibernate resume
.proc.driver.nvidia.suspend_depth: default modeset uvm
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 435.21 Sun Aug 25 08:17:57 CDT 2019
 GCC version: gcc version 9.3.0 (Ubuntu 9.3.0-10ubuntu2)
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Mon May 11 09:03:00 2020
DistUpgraded: 2020-05-10 23:03:38,881 ERROR got error from PostInstallScript ./xorg_fix_proprietary.py (g-exec-error-quark: Failed to execute child process “./xorg_fix_proprietary.py” (No such file or directory) (8))
DistroCodename: focal
DistroVariant: ubuntu
DkmsStatus:
 nvidia, 435.21, 5.3.0-51-generic, x86_64: installed
 nvidia, 435.21, 5.4.0-29-generic, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
 NVIDIA Corporation TU106 [GeForce RTX 2060 Rev. A] [10de:1f08] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company TU106 [GeForce RTX 2060 Rev. A] [103c:6903]
InstallationDate: Installed on 2020-02-09 (92 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
MachineType: ASUS All Series
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-29-generic root=UUID=76319407-17f7-4c79-a8cf-0d3ec709382b ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to focal on 2020-05-10 (0 days ago)
dmi.bios.date: 02/26/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2203
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: Z97-PRO GAMER
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2203:bd02/26/2016:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnZ97-PROGAMER:rvrRevX.0x:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.family: ASUS MB
dmi.product.name: All Series
dmi.product.sku: All
dmi.product.version: System Version
dmi.sys.vendor: ASUS
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.101-2
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.4-2ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20200226-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1874217, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.