> I reinstalled my Ubuntu-Budgie 21.10.> All updates are on October 22. 2021.> Proposed channel is activated.>> Executed this order!>> $ sudo apt install linux-raspi>> Unfortunately, no improvement!> In fkms mode the video playback works.> With kms mode, the system, the video, the mouse pointer in spite of update> freezes again and only Power-Off gets the Raspi 4b 8GB running again.>> $ uname -a> Linux rw-rpi0 5.13.0-1008-raspi #9-Ubuntu SMP PREEMPT Wed Sep 29 08:27:44> UTC 2021 aarch64 aarch64 aarch64 GNU/Linux>> --> You received this bug notification because you are subscribed to the bug> report.> >> Title:> HDMI output freezes under current/proposed impish kernels>> Status in linux-raspi package in Ubuntu:> Confirmed> Status in linux-raspi source package in Impish:> Fix Committed>> Bug description:> [Impact]>> The UI of Impish desktop for raspi occasionally freezes which can be> triggered by playing videos and moving windows around. Seems to happen> more frequently when using higher resolutions and/or higher refresh> rates (higher than 1920x1080@60Hz).>> Kernel errors are along the lines of:> [ 513.762138] [drm:drm_crtc_commit_wait [drm]] *ERROR* flip_done timed> out> [ 513.762288] [drm:drm_atomic_helper_wait_for_dependencies> [drm_kms_helper]] *ERROR* [CRTC:76:crtc-3] co> mmit wait timed out> [ 513.762381] [drm:drm_atomic_helper_wait_for_flip_done> [drm_kms_helper]] *ERROR* [CRTC:76:crtc-3] flip_> done timed out>> [Test Case]>> Install current Impish desktop for raspi on a Pi 4. Use a high-> refresh/resolution monitor. Play videos, move windows around.>> [Fix]>> The Pi foundation identified a couple of upstream vc4 commits that> seem to interfere with their downstream patches. Revert those to match> the Pi foundations currently released 5.10 kernel.>> [Where Problems Could Occur]>> The changes are confined to the vc4 driver, so problems would only> show up if that driver is in use. Which is only the case for the> Ubuntu raspi desktop image, so server images should not be impacted at> all.>> [Original Description]>> Under the current (5.13.0-1007.8) or proposed (5.13.0-1008.9) kernels> for the Ubuntu Pi pre-installed desktop impish release, the HDMI> output occasionally freezes. A known workaround at this time is to> change the following line in /boot/firmware/config.txt:>> dtoverlay=vc4-kms-v3d>> To the following:>> dtoverlay=vc4-fkms-v3d>> In other words, to use the "fake" KMS overlay (fkms) instead of the> "full" KMS overlay (kms).>> I've been unable to determine a reliable method of guaranteeing a> freeze, but it appears to occur much more readily when video playback> is occurring, and when other interactions (especially moving windows> around, minimizing, restoring) occurs simultaneously. Display suspend> also periodically causes...
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