Comment # 14
on bug 105308
from Mariusz Mazur
So, I'm not 100% sure yet, I need time to rebuild 4.14.28 with Michel's patch and run it for a bit, but at this point I'm about 90% certain that a patch in 4.14.29 introduces a regression, as described in bug 106529. And from reading the changelog and looking at the code, it does seem to me that this patch is the most likely culprit. Short version of what's wrong: on a multi-monitor setup, if the primary display is on DP and this code toggles it off/on, the window manager doesn't take it well and you end up with windows all over the place. (I don't know if this is the same codepath as is used with amdgpu.dc=1 on more recent kernels, though I do now the same bug occurs on 4.16+ with dc=1.)
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