I'm not sure if this is a Xorg bug or a Gnome Shell (Mutter) bug so
let's start with both.
** Also affects: mutter (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1870512
Title:
forced software cursor with PageFlip enabled triggers artifacts on
screen
Status in mutter package in Ubuntu:
New
Status in xorg-server package in Ubuntu:
New
Bug description:
The following Xorg configuration triggers faulty behaviour, like
blinking cursor, corrupt graphics around it etc.:
1 Section "Device"
2 Identifier "graphicsdriver"
3 Driver "modesetting"
4 Option "SWCursor" "true"
5 #Option "PageFlip" "off"
6 #Option "AccelMethod" "none"
7 EndSection
Either switching SWCursor to false or uncommenting line 5 or 6 makes the
issue disappear.
Disabling accelleration is naturally the least recommended way of resolving
the issue.
As far as I've analyzed Xorg's source code shipped with 20.04, I can see that
https://gitlab.freedesktop.org/xorg/xserver/commit/0aaac8d783e78c040a70a55ba8d67809abd7e625
which should probably automatically handle the issue (haven't tried to build
with those changes yet) is not included. If it ever should be in (as it looks
like a workaround only), reamains an open question.
I am not entirely sure which package to attach this bug to, Xorg seems
the most viable at the moment. My reason for the uncertainty
originates from the fact, that I have also tested other distros, e.g.
SuSE tumbleweed (build from this week, exact versions to be added if
needed) with KDE plasma, which happens to reproduce the bug only with
OpenGL set as compositor's backend; XRender operates perfectly fine
there; hence it is a bit unclear to me which compoment is the "owning
interface" and which one is actually buggy, be it Xorg, mesa or
compositor; please reassign the bug accordingly if needed.
My plan for the nearest future is to verify whether the aforementioned
change actually circumvents the issue. If anything else should be
looked at to fix the problem, I am open for suggestions.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xserver-xorg-core 2:1.20.7-2ubuntu2
ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
Uname: Linux 5.4.0-21-generic x86_64
ApportVersion: 2.20.11-0ubuntu21
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Fri Apr 3 09:41:57 2020
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
Intel Corporation 4th Gen Core Processor Integrated Graphics Controller
[8086:0416] (rev 06) (prog-if 00 [VGA controller])
Subsystem: Dell 4th Gen Core Processor Integrated Graphics Controller
[1028:060d]
Subsystem: Dell GK107GLM [Quadro K1100M] [1028:060d]
InstallationDate: Installed on 2020-03-30 (4 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200329)
MachineType: Dell Inc. Dell Precision M3800
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-21-generic
root=UUID=1b7a03b4-95ff-4d1b-9897-848a0dc6f8b9 ro quiet splash vt.handoff=7
SourcePackage: xorg-server
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/25/2018
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A12
dmi.board.name: Dell Precision M3800
dmi.board.vendor: Dell Inc.
dmi.board.version: A12
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: Not Specified
dmi.modalias:
dmi:bvnDellInc.:bvrA12:bd05/25/2018:svnDellInc.:pnDellPrecisionM3800:pvrA12:rvnDellInc.:rnDellPrecisionM3800:rvrA12:cvnDellInc.:ct8:cvrNotSpecified:
dmi.product.name: Dell Precision M3800
dmi.product.sku: Dell Precision M3800
dmi.product.version: A12
dmi.sys.vendor: Dell Inc.
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.100-4
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.2-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.7-2ubuntu2
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+git20190815-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1
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