*** This bug is a duplicate of bug 1873587 ***
https://bugs.launchpad.net/bugs/1873587
It sounds like you're reporting both bug 1873587 and something like bug
1874010. So we should probably use those reports for now.
** Tags added: ice-lake-flicker
** Package changed: xorg (Ubuntu) => linux (Ubuntu)
** Summary changed:
- Screen flickering in Kubuntu 20.04 on Lenovo Yoga C940 14-IIL
+ [Ice Lake] Screen flickering in Kubuntu 20.04 on Lenovo Yoga C940 14-IIL
** This bug has been marked a duplicate of bug 1873587
[Ice Lake] Display flickers a lot DURING plymouth animations
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https://bugs.launchpad.net/bugs/1875649
Title:
[Ice Lake] Screen flickering in Kubuntu 20.04 on Lenovo Yoga C940
14-IIL
Status in linux package in Ubuntu:
New
Bug description:
Screen flickering in Kubuntu 20.04 on Lenovo Yoga C940 14-IIL
I am filing this bug again in accordance with:
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1875073/comments/3
I've deleted the repository and checked again, and the bug still persists.
Old bug report: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1875073
My screen flickers on Kubuntu 20.04LTS.
See: https://imgur.com/a/FoWI1sp
Also affected:
Kubuntu 19.10
Fedora 31
System:
inxi -Gxxx
Graphics: Device-1: Intel Iris Plus Graphics G7 vendor: Lenovo driver: i915
v: kernel bus ID: 00:02.0 chip ID: 8086:8a52
Display: x11 server: X.Org 1.20.8 driver: modesetting compositor:
kwin_x11 resolution: 1920x1080~60Hz
OpenGL: renderer: Mesa Intel Iris Plus Graphics (ICL GT2) v: 4.6
Mesa 20.0.4 direct render: Yes
Reproduction scenario's:
1) Starting Kubuntu, screen flickers a couple of times during startup and
turns black for multiple seconds.
2) Start a youtube video, near-constant flickering. Audio works fine.
3) Open up various applications. Screen starts flickering every now and then.
4) Leave pc unattended for a long time, screen starts flickering sporadically.
Things I tried:
* Use various kernels
* linux kernel 3.4, 3.5, 3.6, 3.7rc2
* Ubuntu port of linux kernel 3.4.0-26-generic + patch
https://gitlab.freedesktop.org/jkrzyszt/i915/-/commit/1ee48a61aa57dbdbc3cd2808d8b28df40d938e44
* intel-drm-next (kernel panic)
* Oibaf PPA
* various kernel parameters
What does work:
* When using windows, the screen works. So no hardware error.
* When using "nomodeset" kernel parameter Kubuntu 20.04 works, but then
there's no sound or hardware acceleration.
What I think is happening:
i915 is apperantly an unstable driver for eDP 1.4 screens.
That, in combination with a 10'th gen intel cpu is not a good combination.
According to dmesg the firmware of sof-audio-pci is restarting.
[ 324.775087] sof-audio-pci 0000:00:1f.3: error: no reply expected,
received 0x0
[ 324.866267] sof-audio-pci 0000:00:1f.3: firmware boot complete
Could the audio part of the eDP connection be breaking because of
an issue similar to the patch that is mentioned earlyer?
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
CasperMD5CheckResult: skip
CompositorRunning: None
Date: Tue Apr 28 15:31:27 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 (3 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 2.4.101-2
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.4-2ubuntu1
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
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