Messages in this thread | | | Date | Sun, 2 Nov 2003 11:23:40 -0800 (PST) | From | Dustin Lang <> | Subject | No backlight control on PowerBook G4 |
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Hi,
I just bought a new PowerBook G4 and installed Linux on it. Now the tweaking begins! One of the first orders of business is getting power management working, and I'm a bit stuck.
I'm running kernel version 2.4.22 with Ben Herrenschmidt's 2.4.23-pre5 patches.
On startup, arch/ppc/platform/pmac_backlight.c doesn't recognize the backlight controller. It checks compatibility with a couple of specific machines, and then checks compatibility with the backlight controller. This appears to be the same check that is performed in the Darwin/xnu kernel (at least the version that I found...).
I've got a bit of experience with kernel hacking so I'd be very happy to help figure out what's going on and how to fix it, but I'm also new to this platform and I don't know how one goes about finding hardware documentation and other useful sorts of resources.
Any (non-null) pointers would be appreciated!
Cheers, dstn.
Here are some details from /proc/device-tree that might be relevant (I've used "/" as token separator):
in /: model = PowerBook6,2 compatible = PowerBook6,2/MacRISC3/Power Macintosh
in /pci@f2000000/: model = AAPL,UniNorth compatible = uni-north
in /pci@f2000000/mac-io@17/: model = AAPL,Keylargo compatible = Keylargo
in /pci@f2000000/mac-io@17/backlight@f300/: name = backlight device_type = backlight backlight-control = mnca <---- ack!
in /pci@f2000000/mac-io@17/via-pmu@16000/: name = via-pmu compatible = pmu
in /pci@f2000000/mac-io@17/via-pmu@16000/power-mgt/: compatible = via-pmu-99
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