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How Can I force a greater screen brightness from Windows

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http://superuser.com – I have Sony VAIO and I have problem with brightness when i try to adjust it through fn+f5 or f6 key. When the brightness is set to 100% and when i want to increase it with Fn+f6 keys, brightness decrease dramatically (whereas he should have stayed at 100%). After press keys, brightness is set to 10% and i cannot increase through Fn keys. I can only increase it manually in control panel with cursor. Moreover, when i set brightness manually to min (0-5%), the screen flickers hugely. Moreover, when i set brightness manually to max (100%), the screen is not as bright as new screen All drivers (HowTos)