Red Hat Bugzilla – Bug 505782
gnome-power-manager incorrectly adjusts display backlight levels on MacBook Pro 4,1
Last modified: 2010-12-05 01:51:20 EST
Description of problem:
Although the mbp_nvidia_bl module is loaded and works correctly, attempting to change the display brightness will always result in the backlight being set to the lowest level (0). This results in the display being turned on but with no backlight, rendering the screen unreadable.
Reloading the mbp_nvidia_bl module is a temporary workaround as it resets the display brightness to the maximum value (15) when it is loaded.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Start Fedora and login
2. Press the backlight up/down (F1/F2) keys.
Display is set to minimum brightness (display is on but backlight is turned off)
The display brightness adjusts according to the key pressed
This can also be trigged by connecting/removing the power cord.
The mbp_nvidia_bl module itself is working correctly, as adjusting the backlight via "echo X > /sys/devices/virtual/backlight/mbp_backlight/brightness" works.
This bug appears to have been reported against 'rawhide' during the Fedora 12 development cycle.
Changing version to '12'.
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