Public bug reported:
I'm experiencing a problem extremely similar to
https://gitlab.freedesktop.org/drm/intel/-/issues/272
My screen flickers too on a fresh install of Kubuntu 20.04LTS
https://imgur.com/a/FoWI1sp
Results of `inxi -Gx`
`
Graphics: Device-1: Intel Iris Plus Graphics G7 vendor: Lenovo driver: i915 v:
kernel bus ID: 00:02.0
Display: x11 server: X.Org 1.20.8 driver: modesetting resolution:
1920x1080~60Hz
OpenGL: renderer: Mesa Intel Iris Plus Graphics (ICL GT2)
v: 4.6 Mesa 20.1.0-devel (git-a64d266 2020-04-25 focal-oibaf-ppa)
direct render: Yes
`
I've tried 915.enable_psr=0 as a boot parameter, didn't work.
nomodeset does get me into a bootable image, but I'm looking into getting a
working driver.
Fedora 31 was having a similar issue, there was barely any flickering up untill
some recent kernel updates. (about a couple small ones every 10 minutes or so)
Kubuntu 19.10 was quite stable too, untill I installed a lenovo provided
firmware update (from AUCN45WW to AUCN54WW), which made it slightly worse.
I also tried a couple of other kernel parameters that haven't had any effect.
Running kernel 5.6 on Kubuntu did have thesame issue as regular kubuntu 20.04.
Running kernel 5.7-rc2 did fix the problem, but networking and sound was dead,
so it's only half a solution.
I highly suspect it's an issue with i915, but I don't know how I would trace it
down.
I don't know why and I don't know how.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
Uname: Linux 5.4.0-26-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: KDE
Date: Sat Apr 25 20:49:36 2020
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
GraphicsCard:
Intel Corporation Iris Plus Graphics G7 [8086:8a52] (rev 07) (prog-if 00 [VGA
controller])
Subsystem: Lenovo Iris Plus Graphics G7 [17aa:3801]
InstallationDate: Installed on 2020-04-25 (0 days ago)
InstallationMedia: Kubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
MachineType: LENOVO 81Q9
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-26-generic
root=UUID=5d977dfa-1fa5-412b-9d83-644cef18af6e ro rootflags=subvol=@ quiet
splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/09/2020
dmi.bios.vendor: LENOVO
dmi.bios.version: AUCN54WW
dmi.board.asset.tag: NO Asset Tag
dmi.board.name: LNVNB161216
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40709 WIN
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 31
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo Yoga C940-14IIL
dmi.modalias:
dmi:bvnLENOVO:bvrAUCN54WW:bd01/09/2020:svnLENOVO:pn81Q9:pvrLenovoYogaC940-14IIL:rvnLENOVO:rnLNVNB161216:rvrSDK0J40709WIN:cvnLENOVO:ct31:cvrLenovoYogaC940-14IIL:
dmi.product.family: Yoga C940-14IIL
dmi.product.name: 81Q9
dmi.product.sku: LENOVO_MT_81Q9_BU_idea_FM_Yoga C940-14IIL
dmi.product.version: Lenovo Yoga C940-14IIL
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.101+git2004241830.bf63f8~oibaf~f
version.libgl1-mesa-dri: libgl1-mesa-dri 20.1~git2004250730.a64d26~oibaf~f
version.libgl1-mesa-glx: libgl1-mesa-glx 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
** Affects: ubuntu
Importance: Undecided
Status: New
** Tags: 5.7-rc2 amd64 apport-bug ermine fedora31 focal i915 kubuntu resolution
third-party-packages ubuntu
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https://bugs.launchpad.net/bugs/1875073
Title:
Screen flickering in Kubuntu 20.04 on Lenovo Yoga C940 14-IIL
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