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I have a problem with my Toshiba Satellite R850.

The brightness-adjustment via the Function-Keys and the system settings works properly, but not after putting the Laptop on Sleep-Mode.

The answer given in this thread did the trick for me with Ubuntu 12.10 64-Bit, but doesn't seem to work with Ubuntu 13.04 64-Bit.

Has anyone experienced the same and know a workaround for this?

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I am currently using an earlier trick to control brightness but it is not very practical.

echo 300 | sudo tee /sys/class/backlight/intel_backlight/brightness

Change the 300 to whatever you want.

Waiting for a better solution.

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Thanks, this works even after the sleep mode , but like you said, it is not very practical. I rather reboot to solve the issue, but this ain't a permanent solution... – MalteJ Apr 29 '13 at 13:51

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