[Bug 106199] Cannot get back into DM after logoff (Linux 4.16.2+)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106199

--- Comment #6 from Öyvind Saether <oyvinds at everdot.org> ---
two more notes.

a) my desktop with rx 470 and 3x4k monitors (HDMI/DP/DP) does not have this
problem with amdgpu.dc=1 and kernel 4.16.4.

b) my htpc with 2400g and rx 560 and one screen connected with DP totally has
this problem with both 4.16.4 and 4.17rc2, logging out from xfce does not load
lightdm correctly; instead screen turns into some sort of modern art. When this
happens I can't switch to terminal with ctrl-alt-f2 BUT if I 1) turn the screen
off 2) turn it on again then I can get to a terminal by ctrl-alt-f2 and go back
to lightdm with ctrl-alt-f1 and it shows correctly and normally instead of
modern art.

c) I tried attaching another monitor to the rx 560 and both monitors turned
into modern art upon logout. I just tried this to see if number of monitors
matters. There's some reason one box with rx470 works fine and two with rx560
and rx580 have this problem.

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