I have recently installed Ubuntu 12.04 on my Lenovo Thinkpad Edge E535 laptop along with Jupiter for power saving.
And every time I use Fn key to alter the brightness, the screen turns blank and then turns off. It comes back after pressing a key or about 6 seconds.
Turning inactive is set to never, dimming to save power is unchecked, ran xset s off as well...
From time to time, the screen goes blank even without pressing anything. It happens even when Jupiter is not running.
Does anybody have an idea what might be causing it?
I forgot to say that with Ubuntu 13.04, this didn't happen, but the screen sometimes seemed to be blinking though.
This is the output:
xrandr --current Screen 0: minimum 320 x 200, current 1366 x 768, maximum 1600 x 1600 LVDS connected 1366x768+0+0 (normal left inverted right x axis y axis) 344mm x 193mm 1366x768 60.0*+ 50.0 1360x768 60.0 50.0 1280x768 60.0 50.0 1280x720 60.0 50.0 1024x768 60.0 50.0 1024x600 60.0 50.0 800x600 60.0 50.0 800x480 60.0 50.0 640x480 60.0 50.0 DFP1 disconnected (normal left inverted right x axis y axis) CRT1 disconnected (normal left inverted right x axis y axis)
rockstone@rockstonepc:~$ lspci | grep VGA 00:01.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Device 9903 01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Thames XT/GL [Radeon HD 7600M Series]