I've been testing kernel 6.8.0-38 (from proposed) and while it's not
fixing the problem completely, at least on my hardware it is
significantly better.
The flickering happened only once in 3 days and it was very brief (~1s)
and I didn't have to do anything for it to stop. Previously I had to
move the cursor from the lower portion of the screen for the flickering
to stop.
I can't recommend using kernel 6.8.0-38 since it shows unhealthy amount of warnings related to iommu.
But assuming kernel team fixes the iommu issues, we might have a major relief with the following release.
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https://bugs.launchpad.net/bugs/2062951
Title:
Random flickering with Intel i915 on Linux 6.8 (Ubuntu 24.04)
Status in linux package in Ubuntu:
Confirmed
Bug description:
After migrating Mantic 23.10 install to Linux 6.8.0, I am experiencing heavy flickering at random.
It happens after a moderate to heavy on screen activity like window switching, scrolling etc.
It never happens when playing video or when there is no interaction using keyboard/pointer.
It tend to happen when the mouse cursor is in the bottom quarter of the screen and stops immediately when the cursor leaves that screen region.
Around the same time the following appears in kernel log:
kernel: i915 0000:00:02.0: [drm] *ERROR* CPU pipe A FIFO underrun
Happens on both X11 and Wayland on both KDE plasma and Mate (though
less).
I first encountered the issue with Linux 6.8.0-11 and it still happens with Ubunutu's 6.8.0-28 and Mainline 6.8.7.
Kernels 6.6, 6.5, 6.1 and older did not have that issue.
Hardware is: Dell XPS 9350, Vendor Intel, Driver i915, Skylake GT2 [HD Graphics 520]
Software: Ubuntu 23.10, KDE Plasma 5.27.10 / Mate 1.26
Attaching kernel log for 6.8.0-28
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