mactel-support-community team mailing list archive

[Colin D Bennett <colin@xxxxxxxxxxx>]

On Tue, 31 Jan 2012 11:35:16 -0600
Seth Forshee <seth.forshee@xxxxxxxxxxxxx> wrote:

> > 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.
> 
> Thanks, Colin! I want testing for both machines that do and don't
> have working backlights currently, so this is very helpful.
> 
> > 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
> 
> Hmm. If that's the only device you have then I don't understand
> how you could have had working brightness adjustments previously.
> What devices are present if you uninstall the test driver?
> 
> Also, you aren't booting with acpi_backlight=vendor, are you? If
> you are it will show up in /proc/cmdline.

Here are the results with the stock Ubuntu driver:

    $ cat /proc/cmdline 
    BOOT_IMAGE=/vmlinuz-3.0.0-15-generic root=UUID=53f14c91-bf33-48ed-8845-faf445081024 ro quiet splash vt.handoff=7
    $ ls /sys/class/backlight/
    apple_backlight
    $ ls /sys/class/backlight/apple_backlight
    actual_brightness  brightness      power      type
    bl_power           max_brightness  subsystem  uevent
    $ cat /sys/class/backlight/apple_backlight/max_brightness 
    15

> > 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.
> 
> This is for the display backlight only. The keyboard backlight is
> a completely different driver.

Sorry, I don't mean the 'keyboard backlight', but the F1/F2
special function brightness keys on the laptop keyboard that are
shortcuts for changing LCD backlight brightness. The on-screen
display pops up but nothing happens when the keys are pressed,
just as if I rmmod the apple_bl module.

Regards,
Colin