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I am having an issue on my HP Pavilion g7-1350dx laptop. Whenever I press the keyboard's brightness keys, I notice two things: the display brightens by two steps instead of one, and the Unity OSD displays a shift by two steps. The output of acpi_listen is as follows when I press each button once (first up, then down).

video/brightnessup BRTUP 00000086 00000000
video/brightnessdown BRTDN 00000087 00000000

I have found no solution for this problem to date, however I will mention that this problem is nonexistent when not logged in. When I am idle at lightdm's login screen, pressing either of these buttons only adjusts brightness by one step.

As a side note, I am using fglrx-updates, the proprietary AMD driver for an AMD/ATI BeaverCreek Radeon HD 6520G. I have also looked into the system settings for a shortcut that gnome-settings-daemon uses for brightness, but I could find no such shortcut. I have also tried disabling Action Keys Mode in the BIOS settings, this hasn't worked either.

Any insight or links to answered questions would be greatly appreciated.

Drew Stewart
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1 Answers1

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Changing the brightness value in the /sys/class/backlight/acpi_video0/brightness file can make the issue solved. Here the command:

echo {brightness_value} > /sys/class/backlight/acpi_video0/brightness

Brightness value must be between 0 to 20. I'm not sure whether it can vary device to device.

You could create a script and invoke it on shortcut key press.

I found a reference. I'm pretty sure the marked answer in the following link can make your issue solved. Why does my Thinkpad brightness control skip steps?.

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Wolverine
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