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View Full Version : [ubuntu] Backlight on MBPro only 5 settings, high pitched sound, changes randomly



everfine
March 9th, 2009, 06:29 AM
The backlight on my MBPro 4,1 with 8.10 only goes about a quarter of the way on the bar, makes a high pitched sound when up high, and will dim sporadically. Anyone know how to fix?

cyberdork33
March 9th, 2009, 02:02 PM
are you using the documentation for your mac?
https://wiki.ubuntu.com/MactelSupportTeam/CommunityHelpPages

Which version of Ubuntu are you using?

The dimming is supposed to occur after a certain period of time to conserve battery power. It should, however, go back to normal if you try to use the mouse / keyboard again.

teamjh14
March 9th, 2009, 04:10 PM
I had this problem when I first installed Hardy. Ubuntu uses a light sensor (the same it uses for your keyboard, I suspect) in the MBP to adjust screen brightness, and in Hardy it would adjust the brightness until the screen was black. Intrepid is much better about that.

If it bugs you, go into gconf-editor

apps > gnome-power-manager > backlight >

There are three checkboxes, I think. Just look for the one which dims the backlight.

_mario_
March 10th, 2009, 05:34 PM
The backlight on my MBPro 4,1 with 8.10 only goes about a quarter of the way on the bar, makes a high pitched sound when up high, and will dim sporadically. Anyone know how to fix?

are you referring to the display backlight? then there should be more than 4 or 5 steps available. what does the following command output?


lshal -u `hal-find-by-capability --capability laptop_panel`

ciao,
Mario