http://bugzilla.kernel.org/show_bug.cgi?id=11769
------- Comment #29 from [EMAIL PROTECTED] 2008-11-12 23:17 -------
(In reply to comment #27)
> (In reply to comment #26)
> > > 23:19 - I go to console using Ctrl-Alt-F1. The actual brightness goes to
> > > 100%.
> > this is strange, this is not done by ACPI driver.
> > please do this test, unload the ACPI video driver before you go to console.
> > does the brightness still goes to 100%?
>
> No, it does not. There are absolutely no brightness changes under any
> circumstance when video.ko is not loaded.
>
> > > 23:21 - I press the brightness up/down switches a few times. The values
> > > in
> > > the brightness files never change.
> > this is weird, the dmesg shows that ACPI video driver does change the
> > brightness level upon hotkey event, please press the brightness down button
> > for
> > 5 times, if the brightness doesn't change, attach the output of "cat
> > /proc/.../brightness"
>
> The hotkeys change the physical brightness,
good. :)
> but the files remain unchanged. I
> have just used the keys to reduce the brightness to a very low level, but
> /proc.. still says 100%.
> [EMAIL PROTECTED] cat /proc/acpi/video/VGA/LCD/brightness
> levels: 100 37 12 25 37 50 62 75 87 100
> current: 100
>
hmmm, there are two directories under /proc/acpi/video/, right?
what's the content of /proc/acpi/video/GFX0/DD04/brightness?
what's the content of /sys/.../acpi_video{0,1}/actual_brightness?
I suspect that some other applications, maybe X, changes the backlight when you
press ctrl+alt+f1.
but it's still weird that the value of the procfs I/F is not updated correctly.
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