https://bugs.freedesktop.org/show_bug.cgi?id=70934
--- Comment #4 from Rafał Miłecki zajec5@gmail.com --- I was bisecting over commits touching drivers/gpu/ only, but the one I found seems pretty likely:
eccea7920cfb009c2fa40e9ecdce8c36f61cab66 is the first bad commit commit eccea7920cfb009c2fa40e9ecdce8c36f61cab66 Author: Alex Deucher alexander.deucher@amd.com Date: Mon Mar 26 15:12:54 2012 -0400
drm/radeon/kms: improve bpc handling (v2)
Improve handling of bpc (bits per color) in radeon. In most cases we want 8 except for HDMI, DP, LVDS, and eDP.
v2: handle DP better.
Signed-off-by: Alex Deucher alexander.deucher@amd.com Tested-by: Lennert Buytenhek buytenh@wantstofly.org Signed-off-by: Dave Airlie airlied@redhat.com
I'll verify that further tomorrow.