Comment # 6
on bug 111122
from Nicholas Kazlauskas
(In reply to Brian Schott from comment #3) > I think that I'm seeing something related with my 2700u Inspiron 7375. > > If I have compositing enabled in XFWM4, the system will immediately stop > responding after logging in with LightDM. If the window manager compositing > is disabled, I'm able to log in, but then there is graphical corruption. > > With git bisect I traced the problem back to > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ > ?h=df8368be1382&id=df8368be1382b442384507a5147c89978cd60702 > > I can edit the source file, and by only changing the KMS_DRIVER_MINOR > definition from 32 to 30, get the system working correctly with 5.2.0. Your issue in particular is likely unrelated - it's an issue in userspace. The bisected commit is the one that allowed xf86-video-amdgpu to start scanning out DCC compressed buffers that mesa produces, with the caveat that mesa needs a hook on present for the re-tile. My guess is that hook isn't running when you aren't using "compositing". I'm not sure if mesa or xf86-video-amdgpu have options yet to disable DCC or not, but for that particular setup you'd probably want it disabled.
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