* ThinkPad T420 : 8 versus 16 brightness level steps
@ 2014-02-27 17:25 Toralf Förster
2014-02-28 8:15 ` Bjørn Mork
0 siblings, 1 reply; 2+ messages in thread
From: Toralf Förster @ 2014-02-27 17:25 UTC (permalink / raw)
To: ibm-acpi-devel; +Cc: platform-driver-x86
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/'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.
- --
MfG/Sincerely
Toralf Förster
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: ThinkPad T420 : 8 versus 16 brightness level steps
2014-02-27 17:25 ThinkPad T420 : 8 versus 16 brightness level steps Toralf Förster
@ 2014-02-28 8:15 ` Bjørn Mork
0 siblings, 0 replies; 2+ messages in thread
From: Bjørn Mork @ 2014-02-28 8:15 UTC (permalink / raw)
To: Toralf Förster; +Cc: ibm-acpi-devel, platform-driver-x86
Toralf Förster <toralf.foerster@gmx.de> 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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2014-02-27 17:25 ThinkPad T420 : 8 versus 16 brightness level steps Toralf Förster
2014-02-28 8:15 ` Bjørn Mork
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