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Message #00025
Re: Call for Testing: Updated Apple backlight driver
Hi Seth,
On Tue, 31 Jan 2012 10:55:34 -0600
Seth Forshee <seth.forshee@xxxxxxxxxxxxx> wrote:
> [Note that I'm not subscribed to the mactel-support-community
> list; please Cc me on any replies]
Noted.
> Hi all,
>
> I've been doing some work on the Apple backlight driver in the
> Linux kernel to get support for adjusting the screen brightness
> via the gmux device. This will hopefully get working screen
> brightness adjustment for all Macs that that don't currently have
> it. This support has been floating around in various forms for a
> while now, and what I'm trying to do is get it into stock Ubuntu
> so brightness adjustment will work out-of-the box, more or less.
>
> The driver changes are pretty much complete, and now I'd like to
> get testing on as many different Apple models as possible. If
> you've got a machine with a built-in dispaly and would be willing
> to test, please visit the following page for instructions on how
> you can help.
I updated the wiki page with results from my MacBookPro5,1.
My backlight was working before, with stock Oneiric system, so I am
testing just to make sure the new driver *still* works.
Note that I have no acpi_video device, although the wiki page says
I should have it at a minimum:
$ ls /sys/class/backlight
gmux_backlight
cdb@svelte:/sys/class/backlight/gmux_backlight$ ls -l
total 0
-r--r--r-- 1 root root 4096 2012-01-31 09:16 actual_brightness
-rw-r--r-- 1 root root 4096 2012-01-31 09:16 bl_power
-rw-r--r-- 1 root root 4096 2012-01-31 09:17 brightness
lrwxrwxrwx 1 root root 0 2012-01-31 09:16 device -> ../../../00:08
-r--r--r-- 1 root root 4096 2012-01-31 09:16 max_brightness
drwxr-xr-x 2 root root 0 2012-01-31 09:16 power
lrwxrwxrwx 1 root root 0 2012-01-31 09:16 subsystem -> ../../../../../class/backlight
-r--r--r-- 1 root root 4096 2012-01-31 09:16 type
-rw-r--r-- 1 root root 4096 2012-01-31 09:16 uevent
cdb@svelte:/sys/class/backlight/gmux_backlight$ cat max_brightness
77978
Backlight adjustment through this gmux_backlight 'brightness' file
works. My backlight keys on the keyboard don't work, however, so I
assume other changes are required to hook that up to the new
backlight driver.
Regards,
Colin
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