Public bug reported:
Binary package hint: hal
Machine: Macbookpro 13, nvidia_bl module runs for GeForce 320M
While pressing brightness increase and decrease button, the brightness
levels doesn't increase or decrease but it shows notify-osd
notification. I debugged it and found our that it is an issue with size
of buffer. The effective buffer suze is set to be 3 character size.
Hence the brightness values can only range from 0 - 999. But the
nvidia_bl module creates the corresponding
/sys/devices/virtual/backlight/nvidia_backlight/brightness files. The
maximum brightness is 44000, which cannot reach due to buffer size 3.
and hence only it is possible to increase upto 999.
I have attached a patch which resolves the problem by increasing buffer
size.
** Affects: hal (Ubuntu)
Importance: Undecided
Status: New
** Tags: backlight hal macbookpro nvidia-bl
--
LCD backlight control doesn't work for MacbookPro - patch
https://bugs.launchpad.net/bugs/645195
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