https://bugzilla.novell.com/show_bug.cgi?id=668694
https://bugzilla.novell.com/show_bug.cgi?id=668694#c5
--- Comment #5 from Ricardo Cornet 2011-02-11 19:04:16 UTC ---
In recent days I have been experimenting on the issue.
IN my case, xbacklight says "No outputs have backlight property" all the time.
With both a working backlight and a non-working backlight.
And I noticed that in /sys/class/backlight/ the acer-wmi is not there.
A did not have at hand a suse livecd, so I used Kubuntu 10.04 and 10.10 for
reference.
10.04: loaded acer-wmi in /sys/class/backlight/ but xbacklight reported the
same, BUT I could slide the backlight slide on powerdevil and the Fn keys
worked fine.
In 10.10, Things were like in 11.4 Mx, but doing a manual modprobe solved it.
That's weird because the module is supposed to be autoloaded...
In 11.4 Mx AND current RC1, as in K10.10 modprobe acer-wmi solves it partially.
Function Keys work, but the KDE tools don't recognize it. Which means that the
powerdevil brightness slide does not work and more importantly power-save mode,
do not automatically decreased brightness when in battery.
Doing cat /sys/class/backlight/acer-wmi/actual_brightness you can see your
current brightness. IN acer this is usually in the 0~15 range.
The /proc facilities used to change baclight properties seem to have changed
drastically since kernel 2.6.32 in /proc/acpi which used to feature a video
directory where thing were tunable which is missing since at least kernel
2.6.35, and possibly long before.
In /sys/class/backlight/acer-wmi, nothing seems to be user tunable. It just
show the info.
At least the Fn+key works this way, but that would not be good enough for
non-techies and annoying for techies anyway.
There is something broken between the kernel and the user space utilities. The
kernel should autoloader acer-wmi as per the documentation, KDE should be able
to control the backlight if it is available like the Functions keys indicate,
and xbacklight should provide better info and recognize the backlight when it
is available after modprobing the acer-wmi module.
OK. I hope this experience can be helpful to others with Acer laptops and to
devs to solved this issues.
--
Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are on the CC list for the bug.