Ubuntu laptop freezes when trying to adjust screen brightness?


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Laptop Acer 4810TZ, video integrated (intel). When you try to adjust the brightness hangs tightly. The sliders in the Manager have no effect, when buttons are pressed adjustment indicator appears brightness. The brightness can be changed to boot, even in BIOS.
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There is a workaround — hang does not occur if you set compesa to turn off all the effects to put in None.
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ctrl+alt+F1
Selaginella
to kill x
what happens?
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He's all tightly hangs, or is available from the network via ssh?
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