Commen=
t # 6
on bug 11112=
2
from Nicholas Kazlauskas<=
/a>
(In reply to Brian Schott from comment #3)
> I think that I'm seeing something related with m=
y 2700u Inspiron 7375.
>=20
> If I have compositing enabled in XFWM4, the system will immediately st=
op
> responding after logging in with LightDM. If the window manager compos=
iting
> is disabled, I'm able to log in, but then there is graphical corruptio=
n.
>=20
> With git bisect I traced the problem back to
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/l=
inux.git/commit/
> ?h=3Ddf8368be1382&id=3Ddf8368be1382b442384507a5147c89978cd60702
>=20
> 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 scan=
ning
out DCC compressed buffers that mesa produces, with the caveat that mesa ne=
eds
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.