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Hi, guys, I just install arch linux on macbook pro, but I couldn't change brightness of the screen.
I tried to write 1 to /sys/class/backlight/acpi_video0/brightness, the file has changed but the brightness did not. There are two directories under /sys/class/backlight, one is acpi_video0 and the other is apple_backlight, but neither worked.
I tried to use brightness configure in Gnome, it didn't work either.
The I tried to use xrandr, but it just output this:
→ xrandr 13:11:13
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1280 x 800, current 1280 x 800, maximum 1280 x 800
default connected 1280x800+0+0 0mm x 0mm
1280x800 0.0*
This is my graphic card information:
→ lspci -v | grep -A 8 VGA 13:15:02
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09) (prog-if 00 [VGA controller])
Subsystem: Apple Inc. Device 00fa
Flags: bus master, fast devsel, latency 0, IRQ 49
Memory at a0000000 (64-bit, non-prefetchable) [size=4M]
Memory at 90000000 (64-bit, prefetchable) [size=256M]
I/O ports at 2000 [size=64]
Expansion ROM at <unassigned> [disabled]
Capabilities: <access denied>
The keyboard to change brightness could show the icon but it doesn't actually change it.
And I append nointremap and nomodeset in kernel line.
Any one could help? Thanks!
Update:
The Graphic card is Intel HD Graphics 4000 , and it can not work with xf86-video-intel package. I install all xf86-video-* package, but I don't know which one works.
Update:
Hi, all.
I can change the brightness now by delete the nomodeset in the kernel line. But the graph moved up a lot. There is an area of black at the bottom of the screen and xrandr is still not useable.
And there comes another problem: When I get to the console use ctrl+alt+F1, it just black.
Any help is welcome. Thank you!
Last edited by wb14123 (2012-08-10 02:51:04)
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does your mac have Nvidia or Ati or Intel graphic card, if it is Nvidia install the nvidia drivers and run nvidia-utilities then edit and add the following under device
Option "RegistryDwords" "EnableBrightnessControl=1"
if not install pommed and nvidia-bl from AUR if that doesnt work then check the wiki for macs books and follow the instructions on compiling the special nvidia-bl
hope that helps
Last edited by xcabal (2012-08-08 05:34:19)
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Thanks. But from the lspci message above, I think I have an Intel graphic card.
does your mac have Nvidia or Ati or Intel graphic card, if it is Nvidia install the nvidia drivers and run nvidia-utilities then edit and add the following under device
Option "RegistryDwords" "EnableBrightnessControl=1"if not install pommed and nvidia-bl from AUR if that doesnt work then check the wiki for macs books and follow the instructions on compiling the special nvidia-bl
hope that helps
Last edited by wb14123 (2012-08-08 06:27:43)
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I have to not only install xf86-video-intel, but also install xf86-video-fbdev and xf86-video-vesa. And I tried to install apple-bl-gmux, but when load the module apple_gmux, it said gmux I/O are already in use. Is there any solution?
Update:
I uninstall xf86-video-intel and xf86-video-fbdev, it could work. But I still can not change the brightless.
Last edited by wb14123 (2012-08-09 07:02:37)
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Hi, guys.
I solved this by reinstall xf86-video-intel. And it works fine.
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