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 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-signed-hwe-6.2 in Ubuntu. 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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-signed-hwe-6.2/+bug/2049514/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp