http://bugzilla.kernel.org/show_bug.cgi?id=12249





------- Comment #4 from tetrom...@gmail.com  2008-12-18 19:07 -------
(In reply to comment #3)
> Created an attachment (id=19366)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=19366&action=view) [details]
> patch: always update the props.brightness

OK, with this patch, I can now set the brightness correctly from sysfs.
However, reading the "brightness" sysfs value still gives wrong values; and the
brightness shortcut keys still result in brightness "rolling over" from 100% to
25%.

By chance, do you know how hal/g-p-m might be incrementing or decrementing
brightness? My guess is that hald is writing some magic value to something in
/sys/class/backlight/acpi_video0/ but I am not sure what it is...


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