Re: no backlight on radeon after recent kernel "upgrade"s

quoted

Howerver, I *do* strongly wish for a way to combine various drivers into a
single backlight device, where radeon/intelfb takes care of some stuff,
ibm-acpi/asus-laptop/sony-laptop takes care of other stuff, etc.  Also, a
standard naming for the builtin screen(s) would help, calling it "ibm",
"asus", "sony" is not good IMHO.

I wasn't aware of this problem. If some devices need bits from both
raedon/whatever and acpi, the current implementations are just plain
wrong. Its not really a backlight class problem and more of an
implementation and interaction problem between acpi and the framebuffer
drivers. They should be presenting and registering *one* backlight class
device, not two. Without knowing more about the circumstances and
how/when to combine which drivers its hard for me to help further...

This is always been a problem. For the fbdev layer you can run vesafb with 
a specific fbdev driver and they both access the same hardware. There is 
no really way around this. The user has to be smart enough to not enable 
bothe drivers.


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