** Description changed:
- Screen flickering in Kubuntu 20.04 on Lenovo Yoga C940 14-IIL
+ 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
+ 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
+ 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
+ * 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 :00:1f.3: error: no reply expected,
received 0x0
- [ 324.866267] sof-audio-pci :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?
+ 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 :00:1f.3: error: no reply expected,
received 0x0
+ [ 324.866267] sof-audio-pci :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]
+ 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
