Comment # 6
on bug 104439
from Urs Fleisch
Since Arch Linux switched to kernel 4.14 for linux-lts (and the standard linux package is at 4.15), I now have the choice between two kernels which do not work with my Intel graphics Q35, this gives me quite some motivation to help fixing this issue. Note that I do not know a real workaround, UXA is not an option, it crashes regularly, the modesetting driver does not work with my hardware (it needs at least OpenGL 2.1) and switching off the GPU in Chromium can mitigate the problem, but it still happens. I made a bisect using the linux-git kernel from AUR and started where the bisect from Francesco Turco stopped (its first bad commit contained only hwmon stuff, but I really expect some i915 code in the first bad commit). I will attach my bisect log (named git_bisect_log_2.txt). My first bad commit is [170fa29b14fadf2deb361589cefe6a78b21b1b22] drm/i915: Simplify eb_lookup_vmas() Some remarks about the bisect: To know if a commit is good or bad, I booted the kernel and started Chromium with maps.google.com. If the graphics was distorted, I marked it bad. Two commits were not so easy to judge: "[79364227e6b4923478e99d8480d62482b588ef84] IB/core: Add might_sleep() annotation to ib_init_ah_from_wc()" did not distort the graphics, but I could no longer move the mouse pointer (the computer was still controlable via keyboard), so I marked that commit as good. The second problem commit was near the end of the bisect procedure "[170fa29b14fadf2deb361589cefe6a78b21b1b22] drm/i915: Simplify eb_lookup_vmas()" did not show the distortion, but after browsing maps.google.com, the computer was totally locked up, I had to push the power button to restart it, so I marked this commit as bad. This is the commit which is now marked as the first bad, probably the distortion was introduced later, but the commit before "[c7c6e46f913bb3a6ff19e64940ebb54652033677] drm/i915: Convert execbuf to use struct-of-array packing for critical fields" was good. I will probably have a look at some of the later commits to gain more information.
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