Comment # 7
on bug 104531
from Parag
(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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