Created attachment 851098 [details] dmesg output Description of problem: Screen goes black and then restarts again. After several blackouts system hangs. This happens on Samsung Ativ Book 9 Lite. Version-Release number of selected component (if applicable): 3.12.7-300.fc20.x86_64 How reproducible: For some reason this only happens when using Firefox. There is no problems with Chrome. I guess you can reproduce it with some other applications. Steps to Reproduce: 1. Open Firefox. 2. Start browsing. 3. Screen will go off and on again. Actual results: After several video card restarts screen won't go on again. Expected results: Opposite of the described above. Additional info: dmesg output attached.
Just happened outside of Firefox. I can't find consistent pattern to reproduce. I guess the only requirement is owning that video card: 00:01.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Temash [Radeon HD 8250/8280G]
For what it is worth I have been following this report as I have had the same problem. The screen goes dark seeming at random. By chance, I noticed I could reproduce the problem by reducing the screen brightness. I changed my backlight options in the BIOS and the problem seems to have resolved (although my brightness keys do not work). Hope this information helps debug the problem (or provides a potential work around to others with this card).
(In reply to bodhi.zazen from comment #2) > For what it is worth I have been following this report as I have had the > same problem. The screen goes dark seeming at random. > > By chance, I noticed I could reproduce the problem by reducing the screen > brightness. I changed my backlight options in the BIOS and the problem seems > to have resolved (although my brightness keys do not work). > > Hope this information helps debug the problem (or provides a potential work > around to others with this card). I had to create a .conf file with following content inside /etc/X11/xorg.conf.d/ directory: Section "Screen" Identifier "Default Screen" Device "Default Video Card" DefaultDepth 24 EndSection Section "Device" Identifier "Default Video Card" Driver "radeon" # or this for Radeon open source drivers Option "NoAccel" "true" EndSection But this will disable hardware acceleration, solving all the black screen problems though. Without hardware acceleration full-screen video, especially hd, became very laggy, so I switched to AMD blob driver eventually (only 14.1 beta work correctly, btw, so called 'stabe' doesn't work properly). I'm looking forward for better FOSS driver though.
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