Comment # 8
on bug 111922
from Alex Deucher
(In reply to Pierre Ossman from comment #7) > I finally got a build environment set up, and the winner is: > > > df8368be1382b442384507a5147c89978cd60702 is the first bad commit > > commit df8368be1382b442384507a5147c89978cd60702 > > Author: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> > > Date: Wed Feb 27 12:56:36 2019 -0500 > > > > drm/amdgpu: Bump amdgpu version for per-flip plane tiling updates > > > > To help xf86-video-amdgpu and mesa know DC supports updating the > > tiling attributes for a framebuffer per-flip. > > > > Cc: Michel Dänzer <michel@daenzer.net> > > Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> > > Acked-by: Alex Deucher <alexander.deucher@amd.com> > > Reviewed-by: Marek Olšák <marek.olsak@amd.com> > > Signed-off-by: Alex Deucher <alexander.deucher@amd.com> > > > > :040000 040000 06a7975c484e74ebdaa4ccf9ee1dc5dac7a0abc9 ab68acde511d49b3f96818066bba35f255ce1656 M drivers > > Which seems extremely odd given the contents of that commit. But I guess it > makes userspace change behaviour in a way that provokes the bug? > > I don't think bisect will get me further. Help? Userspace only enables per flip tiling updates if the version of the kernel driver is new enough to support that feature. Maybe this is related to the DCC changes in mesa.
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