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Sony Vaio: Unable to control display brightness

asked 2012-04-03 01:59:09 -0500

sameersbn gravatar image

updated 2013-06-03 22:54:39 -0500


I bought a new sony vaio laptop (VPCEH3AEN) and installed Fedora 16 (updated to the latest packages using yum) on it. I am using KDE 4 as my primary desktop.

The laptop has NVIDIA graphics and i am using the opensource nouveau drivers.

Everything is working well out of the box, except for one thing.

I am not able to adjust the brightness of the LCD. The LCD is always at full brightness at all times. This is turning out be a huge strain on the eyes.

Any ideas on how i could fix this issue?

Looking forward to your replies.

Thanks and Regards ~Sameer

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answered 2012-04-03 13:02:32 -0500

sameersbn gravatar image

I installed the kmod-nvidia drivers from the rpmfusion repository and now i am able to change the display brightness using echo "XX" > /sys/class/backlight/acpi_video0/brightness, where XX is the brightness value in the range 0 - 15.

But the KDE desktop (Battery Monitor) is not able to do it on its own. Adjusting the brightness level using the Screen Brightness slider on the Battery monitor.

I added the configuration line Option "RegistryDwords" "EnableBrightnessControl=1" to /etc/X11/xorg.conf as described on the post, but the screen brightness OSD does not show up when i try to change it using the Fn keys.

Please help.

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Asked: 2012-04-03 01:59:09 -0500

Seen: 2,577 times

Last updated: Jun 03 '13