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Every time I lock my screen and then unlock it again I get a really annoying screen flicker that stays until the next reboot. It's not like a graphic glitch it's like the screen is refreshing at a wrong Hz rate. Any ideas for fixes?

Specs: Mobility Radeon HD5470 Graphic card with generic out of the box linux driver, Ubuntu 11.10 64-bit with the 3.0.0-15-generic kernel.

**I would like it if there's a solution not involving the ati proprietary drivers, because they have been nothing but trouble on my machine in the past.

Thanks in advance

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up vote 0 down vote accepted

I recommend downloading the official ATI drivers and give it a try with them:

Download the newest ATI driver (current version is 12.1)


Once downloaded go to the file location and set it to run as executable

cd /path_of_the_file
chmod 755

Use these steps to install

sh ./ --buildpkg Ubuntu/oneiric
sudo dpkg -i fglrx*.deb

Once the driver is installed you need to start up a new xorg.conf file with this command

sudo aticonfig --initial -f


sudo reboot
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yeah I know...but that's what I would like to avoid. Are there any xorg settings I could fiddle with for example? since it's just a minor annoyance I'll live with it for now – Daniel Feb 4 '12 at 19:57

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