Comment # 1 on bug 1209224 from Yifan Jiang

> In System Settings / Power Management / Energy Saving, on the On AC Power Tab, 
> the Screen Energy Saving is checked and it is set to switch off after 10 min.

...

> Looking at my zypper history, I see that powerdevil5 was updated from 
> 5.26.5-1.1 x86_64 to 5.27.0-1.1 x86_64 so I suspect that is the real source of 
> the problem since turning off Screen Energy Saving stops the problem from 
> occurring.

Thanks Joe for the elaborate description.

Let me put it in Daike's queue, who is able to drive further analysis.