Re: ThinkPad T420 : 8 versus 16 brightness level steps

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Toralf Förster <toralf.foerster@xxxxxx> writes:

> /'m wondering why under a 64 bit RedHat 6.4 Linux with kernel 2.6.32+X
> I do have 16 levels in dimming the display brightness with Fn+Pos1/End
> whereas under a 32 bit Gentoo Linux with recent 3.1x.y kernels I do
> just have 8 steps from min to max.

My guess would be this:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/platform/x86/thinkpad_acpi.c?id=122f26726b5e16174bf8a707df14be1d93c49d62



Bjørn
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