I can't see a problem in that screenshot or the logs. Maybe consider
attaching a video instead?
Also please tell us if the problem happens:
* Without your custom xrandr commands
* In a Wayland session (select 'Ubuntu on Wayland') from the login
screen after selecting your username.
** Tags added: xrandr-scaling
** Tags added: multimonitor
** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu)
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
** Also affects: mutter (Ubuntu)
Importance: Undecided
Status: New
** Changed in: mutter (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1893969
Title:
Screen corruption and delayed update using onboard Intel video
Status in mutter package in Ubuntu:
Incomplete
Status in xorg-server package in Ubuntu:
Incomplete
Bug description:
I frequently get screen corruption or delayed screen updates using
onboard Intel video (i7-10710U in a Dell XPS 13 7390). I am attaching
a screen shot of an example of this in Emacs, where you can see echoes
of past cursor locations (center right side of screen, the highlighted
word "boolean").
A frequent failure is that an application updates its window, but the
updates do not appear on screen until I take some action to disturb
the window (move or resize it, change focus, change desktops, etc.),
after which it cleans itself up. Small changes (such as selecting
text) will often clean up the image where the change is made without
repainting the entire window.
My display panel is 4K UHD+, and I have attached two external Full HD
DisplayPort monitors using chaining with 2x2 scale using XrandR. This
corruption appears to happen on all three surfaces. The configuration
for my desktop is:
HIX=3840
HIY=2160
HI=${HIX}x${HIY}
xrandr --fb $(($HIX * 3))x$HIY \
--output eDP-1 --auto --panning ${HI}+$(($HIX * 2))+0 \
--output DP-2-8 --auto --panning ${HI}+$HIX+0 \
--scale-from $HI --left-of eDP-1 --scale 2x2 \
--output DP-2-1 --auto --panning $HI+0+0 \
--scale-from $HI --left-of DP-2-8 --scale 2x2
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.8
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop:
Date: Wed Sep 2 11:48:03 2020
DistUpgraded: 2020-06-21 15:36:52,619 DEBUG Running PostInstallScript:
'./xorg_fix_proprietary.py'
DistroCodename: focal
DistroVariant: ubuntu
DkmsStatus: v4l2loopback, 0.12.3, 5.4.0-42-generic, x86_64: installed
DpkgLog:
ExtraDebuggingInterest: Yes
GraphicsCard:
Intel Corporation Device [8086:9bca] (rev 04) (prog-if 00 [VGA controller])
Subsystem: Dell Device [1028:0962]
MachineType: Dell Inc. XPS 13 7390
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-42-generic
root=UUID=aeb9197c-491f-493d-9a7a-7094efd5023c ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to focal on 2020-06-21 (72 days ago)
dmi.bios.date: 11/25/2019
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.4.0
dmi.board.name: 0377MH
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr1.4.0:bd11/25/2019:svnDellInc.:pnXPS137390:pvr:rvnDellInc.:rn0377MH:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 13 7390
dmi.product.sku: 0962
dmi.sys.vendor: Dell Inc.
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.101-2
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.8-0ubuntu1~20.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2.2
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
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