Sometimes screen flashes black, probably a driver issue?

Bug #2066268 reported by Ellie

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14
This bug affects 2 people
Affects Status Importance Assigned to Milestone
Ubuntu
Incomplete
Undecided
Unassigned

Bug Description

I am using Ubuntu 24.10. Randomly, possibly associated with the position of the mouse on the screen (although it's hard to tell), the screen will flash a few times, not white flashing, but blank. I cannot replicate it, although if I don't move my mouse it seems to keep going for a bit longer maybe? This was an issue on 24.04 as well when I tried that, however it was not a noticeable issue on 23.10 as far as I know, which is what I was using before. I assume this is some kind of driver issue. Hopefully the bug report shows what CPU and iGPU I have, but if not it's the i5-6200U with Intel HD Graphics 520. I'm not sure if you guys stopped supporting this one? This computer is from 2016 after all and the processor has since been discontinued. The issue seems to be worse when I'm using my browser, but it's inconsistent and hard to tell what's causing it. I would love to get this fixed, because it's really distracting.

ProblemType: Bug
DistroRelease: Ubuntu 24.10
Package: xorg 1:7.7+23ubuntu3
ProcVersionSignature: Ubuntu 6.8.0-31.31-generic 6.8.1
Uname: Linux 6.8.0-31-generic x86_64
ApportVersion: 2.28.1-0ubuntu4
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: pass
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Tue May 21 06:05:32 2024
DistUpgraded: Fresh install
DistroCodename: oracular
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation Skylake GT2 [HD Graphics 520] [8086:1916] (rev 07) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Device [17aa:5053]
InstallationDate: Installed on 2024-05-21 (0 days ago)
InstallationMedia: Ubuntu 24.10 "Oracular Oriole" - Daily amd64 (20240520)
Lsusb:
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 001 Device 002: ID 8087:0a2b Intel Corp. Bluetooth wireless interface
 Bus 001 Device 003: ID 138a:0017 Validity Sensors, Inc. VFS 5011 fingerprint sensor
 Bus 001 Device 004: ID 04f2:b52c Chicony Electronics Co., Ltd Integrated Camera
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
MachineType: LENOVO 20FN002SUS
ProcEnviron:
 LANG=en_US.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.8.0-31-generic root=UUID=442cd73e-b616-45e6-8bd6-17cf5b1cc167 ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/21/2022
dmi.bios.release: 1.45
dmi.bios.vendor: LENOVO
dmi.bios.version: R06ET71W (1.45 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20FN002SUS
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: 16070
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.9
dmi.modalias: dmi:bvnLENOVO:bvrR06ET71W(1.45):bd02/21/2022:br1.45:efr1.9:svnLENOVO:pn20FN002SUS:pvrThinkPadT460:rvnLENOVO:rn20FN002SUS:rvrNotDefined:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_20FN_BU_Think_FM_ThinkPadT460:
dmi.product.family: ThinkPad T460
dmi.product.name: 20FN002SUS
dmi.product.sku: LENOVO_MT_20FN_BU_Think_FM_ThinkPad T460
dmi.product.version: ThinkPad T460
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.120-2build1
version.libgl1-mesa-dri: libgl1-mesa-dri 24.0.7-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:21.1.12-1ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:22.0.0-1build1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20210115-1build1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.17-3

Revision history for this message
Ellie (feedmepaperr) wrote :
Revision history for this message
Daniel van Vugt (vanvugt) wrote :

Thanks for the bug report. Next time it happens please run:

  journalctl -b0 > journal.txt

and attach the resulting text file here.

tags: added: flicker
affects: xorg (Ubuntu) → ubuntu
Changed in ubuntu:
status: New → Incomplete
Revision history for this message
Florian Hackenberger (f-hackenberger) wrote :

Also happens to me, since the 24.04 upgrade on a System76 LemurPro9. It has an CometLake-U GT2 [UHD Graphics] (rev 02) graphics card and I'm using an external screen through USB-C. I'll attach logs once I capture them.

Revision history for this message
Daniel van Vugt (vanvugt) wrote :

It's probably best to open your own bug in case there are multiple root causes.

Revision history for this message
Florian Hackenberger (f-hackenberger) wrote :

Here's the relevant log line:
May 29 10:42:39 hacki-mobile kernel: i915 0000:00:02.0: [drm] *ERROR* CPU pipe A FIFO underrun

Revision history for this message
Florian Hackenberger (f-hackenberger) wrote :

I'll check according to https://wiki.archlinux.org/title/Intel_graphics#Screen_flickering if setting i915.enable_psr=0 helps with that.

Revision history for this message
Daniel van Vugt (vanvugt) wrote :

"FIFO underrun" would be a black flash, yes. But one that we can't fix from userspace. Hopefully the kernel change i915.enable_psr=0 helps you.

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