Created attachment 118244 [details]
I've tried a number of desktop environments and window managers and they all behave the same. When the power saving mode is activated, any attempt to wake up the monitor with a keyboard or mouse results in a blank screen, waits a few seconds, and then goes back to power saving mode.
The monitor is: http://www.samsung.com/us/support/owners/product/LU28D590DS/ZA
I have to resort to using another computer to ssh in and running a combo of "xset dpms force on" and "xset dpms force off" until the display comes online.
This issue has been present since I bought the monitor fall 2014 and tried with a number of xorg / gpu / kernel upgrades. However, this issue is not present on Windows 8 / 10.
Created attachment 118245 [details]
lscpi -vvv output
Created attachment 118246 [details]
Created attachment 118247 [details]
This looks to have been fixed from 4.2->4.3 xf86-video-ati 7.5->7.6 and I thank you immensely. My sanity has been restored.
(In reply to Adam Flott from comment #4)
> This looks to have been fixed from 4.2->4.3 xf86-video-ati 7.5->7.6 and I
> thank you immensely. My sanity has been restored.
That is Linux kernel 4.2->4.3