Macbook Pro 5,3 Video Issues
Hello,
On my system (Linux 3.3, booting in EFI mode, using Nouveau with nouveau.noaccel=1 due to https://bugs.freedesktop.org/show_bug.cgi?id=27501 ), I can't figure out how to change the backlight or switch which of the two graphics cards (I have an Nvidia 9600M GT and a 9400M, both are recognized by nouveau but only the 9400M is ever used) Linux uses for the framebuffer or X uses for the output. I have /sys/class/backlight/nv_backlight, and writting to nv_backlight/brightness does change the value in nv_backlight/actual_brightness, but no actual screen changes occur. I'm using the in-tree staging version of nouveau, so I wasn't sure which ML this should go to.
Cheers,
Shea Levy
Quoted 14 lines · Shea Levy
Hello,
On my system (Linux 3.3, booting in EFI mode, using Nouveau with nouveau.noaccel=1 due to
https://bugs.freedesktop.org/show_bug.cgi?id=27501 ), I can't figure out how to change the backlight or switch which of the two graphics cards (I have an Nvidia 9600M GT and a 9400M, both are recognized by nouveau but only the 9400M is ever used) Linux uses for the framebuffer or X uses for the output. I have/sys/class/backlight/nv_backlight, and writting to nv_backlight/brightness does change the value in nv_backlight/actual_brightness, but no actual screen changes occur. I'm using the in-tree staging version of nouveau, so I wasn't sure which ML this should go to.
Both of these are probably controlled by the gmux device on your machine. I've submitted a driver that gets the backlight working [1]. I haven't worked on the GPU muxing yet though, because the machine I'm working with (MacBook Pro 8,2) has graphics issues under EFI boot that I haven't had time to sort out.
Seth