Screen turns black when lowering brightness

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)

New output

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]

1 Answer

most probably, the brightness settings of your notebook is a bit out of standard, similar to apple notebooks. You can play with brightness settings trough xrandr to get more detailed message what is going on. Most probably it is a hardware specific. Type:

xrandr --current

add the output to your question. This will return to you the notebook display ID, could be LVDS0 or LVDS-0

xrandr --output <outputname> --brightness 0.8

• try different values. Setup the monitor cloning in case you get into blank screen, so you will see the screen on external display (if you have some).
• try to search for help for your hardware or report a bug. Brightness keys probably are not implemented good for your notebook type.

Added: Definitely there is a solution for that: (Cannot change brightness on my laptop (Lenovo ThinkPad Edge E535)) but it is for 12.10