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#1 2010-08-18 15:34:57

cujo
Member
Registered: 2007-03-28
Posts: 45

Macbook Pro and Backlight control

I have a macbook pro 6,2 and I'm having problems getting the backlight control working.  I've installed pommed but it seems to be having trouble with this system.

When I run pommed -d, I get this (amongst other, I think, irrelevant info)...

DMI vendor name: [Apple Inc.]
DMI product name: [MacBookPro6,2]
I: DMI machine check: running on a MacBookPro6,2
System: Linux 2.6.34-mbp x86_64
Failed to access brightness node: No such file or directory

I've installed and loaded nvidia-bl and have the nvidia and nvidia-utils packages installed also.

Has anyone had success with this system or run into a similar problem?  I'm stumped and really wanting backlight control.

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#2 2010-08-18 19:34:48

litemotiv
Forum Fellow
Registered: 2008-08-01
Posts: 5,026

Re: Macbook Pro and Backlight control

Does:

# cat /sys/class/backlight/nvidia_backlight/brightness

Produce anything?


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#3 2010-08-18 22:05:55

Allan
Pacman
From: Brisbane, AU
Registered: 2007-06-09
Posts: 11,365
Website

Re: Macbook Pro and Backlight control

http://allanmcrae.com/2010/04/installin … k-pro-5-5/ and scroll down to "Screen Brightness".   Might help

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#4 2010-08-18 22:36:56

cujo
Member
Registered: 2007-03-28
Posts: 45

Re: Macbook Pro and Backlight control

litemotiv:  It gives "10"

Allan: I've already loaded nvidia-bl.  No good.

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#5 2010-08-20 09:00:00

litemotiv
Forum Fellow
Registered: 2008-08-01
Posts: 5,026

Re: Macbook Pro and Backlight control

Did you blacklist the mbp_nvidia_bl module in rc.conf?

P.s., don't update to kernel 2.6.35, nvidia-bl won't work there yet.


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#6 2010-08-21 21:10:38

cujo
Member
Registered: 2007-03-28
Posts: 45

Re: Macbook Pro and Backlight control

I did.  Still no good.  I'm still on 2.6.34 fwiw.

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#7 2010-08-21 21:29:16

litemotiv
Forum Fellow
Registered: 2008-08-01
Posts: 5,026

Re: Macbook Pro and Backlight control

If the module works, you should be able to echo different values to that sysfs entry. For instance, as root:

echo 5 > /sys/class/backlight/nvidia_backlight/brightness

If that doesn't work, then the module probably doesn't support your 6,2 model yet. In this case you might still be able to change the brightness with the 'smartdimmer' utility from the nvclock package.


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#8 2010-08-21 21:47:00

cujo
Member
Registered: 2007-03-28
Posts: 45

Re: Macbook Pro and Backlight control

Thanks for the help.  It appears that this is a no-go for now.  I'll just deal with it for now and try again in the future when it frustrates me again.

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#9 2010-08-21 22:17:09

litemotiv
Forum Fellow
Registered: 2008-08-01
Posts: 5,026

Re: Macbook Pro and Backlight control

It seems there is another module which might work better with the 6-series:

mbp-nvidia-bl-dkms (0.24.3~lucid) lucid; urgency=low

  [ Mario Schwalbe ]
  * Added MacBook Pro 6,1 and 6,2
  * No information for MacBook Pro 7,1 yet.

There is no AUR package for it though, so you will have to try the source from launchpad: https://launchpad.net/~mactel-support/+ … /+packages


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#10 2010-09-02 10:36:52

Klonji
Member
Registered: 2010-06-22
Posts: 13

Re: Macbook Pro and Backlight control

I've got a macbookpro6,2 too and i've just add this pkgbuild http://aur.archlinux.org/packages.php?ID=40457

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