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Bug#443111: laptop: can't set brightness from within X11

On Tue, Sep 18, 2007 at 09:44:56PM +0200, Brice Goglin wrote:
> You should probably use the xbacklight tool (xbacklight package) instead
> of the brightness control keys. The latter might change things in the
> back of the driver (through the BIOS), causing possible problems.

I think xbacklight is more like a work around but not a real solution.
The brightness settings with acpi buttons do work right now with the old
driver and I can't get the point why the newer driver refuses to use the
functionality. brightness control keys don't change things without
noticing the operating system. Every change to the brightness is noticed
in /sys/class/backlight/acpi_video0/actual_brightness.

> There are some problems with xbacklight though, for instance bug #438969.
>> This doesn't happen if I downgrade to 1.7.2-4.
> Have you ever tried with previous releases of xserver-xorg-video-intel,
> for instance 2.0.0 or 2.1.0?

No. These drivers did lock my system too often if switching between VT
and X11 or exiting Xfce back to xdm so I didn't used them much. The
newest driver does freeze less often. But next weekend I will have a bit
more time to play. :-) Just now I switched back to the old driver.
Brightness keys work like a charm, no freeze if switching from X11 to VT
or if exiting Xfce and reentering xdm... Good old times ;-)



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