[Bug 104531] Cannot turn monitor off over DP cable

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=104531

--- Comment #7 from Parag <parag.warudkar@gmail.com> ---
(In reply to Alex Deucher from comment #3)
> (In reply to Parag from comment #2)
> > This is happening to me with a R7 240 with DP or HDMI cables, with 4
> > different monitors - Acer, Dell, 2x Lenovo. No errors in dmesg, just that
> > screen refuses to stay off after DPMS standby/off - wakes back up instantly.
> > 
> > Tried on Ubuntu 18.04.1 and OpenSUSE Tumbleweed all the way up to latest
> > 4.9.x kernel with same results.
> > 
> > Any pointers on how to debug this greatly appreciated.
> 
> Are you manually turning off the displays using xset or something like that,
> or are you seeing this behavior when your desktop environment enters a dpms
> state?

Correction : this happens to me on RX560 card - R7 240 was the one that worked
fine. It happens with 1xAcer 1x Dell monitor combo as well 2x Lenovo ones - so
monitor brand doesn't seem to matter.

5:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Baffin
[Radeon RX 460/560D / Pro 450/455/460/555/560] (rev e5)

Also to answer your question it happens when I set it manually using xset dpms
force standby for example. But problem also happens when desktop tries to enter
dpms state - tried with various distros/GNOME/KDE with same results - the
monitor fails to go to sleep. The difference being in the first case the screen
turns black for a second or so, monitor power light is still white and then the
screen comes back on. 

In the second case I either see grey screen with mouse some times and lock
screen in others but I am able to move the mouse and log back in - nothing
seems broken in either case other than the fact that both monitors fail to
sleep.

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