Public bug reported:
Note: this has been happening for many of the past kernel releases.
Wasn't seeing this under Ubuntu-22.04 until around 6 months ago - but
it's been triggering ever since (although not all the time)
Basically I'll be docked at work on my Dell Latitude laptop, pull out
the USB-C connector (which power/ethernet/HDMI runs through) and go
home. Then plug into a similar dock at home. End result is the same
whether it's work->home or home->work, the laptop un-sleeps, monitor
comes back to life - but the screen is flickering, wayland seems to
think the monitor is waay bigger than it is (eg fonts are big) and it's
unusable.
Once in this state, plugging/unplugging cables doesn't help - only a
reboot fixes the problem. Then it all works again for several
home<->work journey's - until it happens again. No real rhythm to it
from what I can see - maybe once every couple of weeks? But definitely
related to coming back from sleep-mode
Googling around shows the same symptoms related to the kernel error
i915 0000:00:02.0: [drm] *ERROR* CPU pipe A FIFO underrun: transcoder
Suggested fixes seems to mention it's related to cstate and a suggested
fix is to edit /etc/default/grub with
GRUB_CMDLINE_LINUX="i915.enable_psr=0 intel_idle.max_cstate=4"
I'm going to give that a go to see if it helps
ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: linux-image-6.2.0-39-generic 6.2.0-39.40~22.04.1
ProcVersionSignature: Ubuntu 6.2.0-39.40~22.04.1-generic 6.2.16
Uname: Linux 6.2.0-39-generic x86_64
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Wed Jan 17 04:03:13 2024
InstallationDate: Installed on 2022-03-13 (673 days ago)
InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Alpha amd64 (20220313)
RebootRequiredPkgs: Error: path contained symlinks.
SourcePackage: linux-signed-hwe-6.2
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: linux-signed-hwe-6.2 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug jammy wayland-session
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https://bugs.launchpad.net/bugs/2049514
Title:
sleeping laptop and moving between external monitors triggers screen
flickering
Status in linux-signed-hwe-6.2 package in Ubuntu:
New
Bug description:
Note: this has been happening for many of the past kernel releases.
Wasn't seeing this under Ubuntu-22.04 until around 6 months ago - but
it's been triggering ever since (although not all the time)
Basically I'll be docked at work on my Dell Latitude laptop, pull out
the USB-C connector (which power/ethernet/HDMI runs through) and go
home. Then plug into a similar dock at home. End result is the same
whether it's work->home or home->work, the laptop un-sleeps, monitor
comes back to life - but the screen is flickering, wayland seems to
think the monitor is waay bigger than it is (eg fonts are big) and
it's unusable.
Once in this state, plugging/unplugging cables doesn't help - only a
reboot fixes the problem. Then it all works again for several
home<->work journey's - until it happens again. No real rhythm to it
from what I can see - maybe once every couple of weeks? But definitely
related to coming back from sleep-mode
Googling around shows the same symptoms related to the kernel error
i915 0000:00:02.0: [drm] *ERROR* CPU pipe A FIFO underrun: transcoder
Suggested fixes seems to mention it's related to cstate and a
suggested fix is to edit /etc/default/grub with
GRUB_CMDLINE_LINUX="i915.enable_psr=0 intel_idle.max_cstate=4"
I'm going to give that a go to see if it helps
ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: linux-image-6.2.0-39-generic 6.2.0-39.40~22.04.1
ProcVersionSignature: Ubuntu 6.2.0-39.40~22.04.1-generic 6.2.16
Uname: Linux 6.2.0-39-generic x86_64
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Wed Jan 17 04:03:13 2024
InstallationDate: Installed on 2022-03-13 (673 days ago)
InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Alpha amd64 (20220313)
RebootRequiredPkgs: Error: path contained symlinks.
SourcePackage: linux-signed-hwe-6.2
UpgradeStatus: No upgrade log present (probably fresh install)
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https://bugs.launchpad.net/ubuntu/+source/linux-signed-hwe-6.2/+bug/2049514/+subscriptions
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