Re: [PATCH] xf86-video-intel: Add support for toshiba backlight interface

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On Wed, Mar 14, 2012 at 11:37:39PM +0900, Akio Idehara wrote:
> xfce4-power-manager cannot control backlight brightness via
> toshiba backlight sysfs interface.
> The reason is that xf86-video-intel doesn't treat it.
> This patch adds support for toshiba backlight sysfs interface.
> 
> This was tested on a Toshiba Portege R500.
> 
> Signed-off-by: Akio Idehara <zbe64533@xxxxxxxxx>

This isn't a good idea. On many (probably most) Toshibas the platform
backlight interface is read-only. I think this patch will break more
machines than it fixes.

I have a patch for toshiba_acpi that (among other things) makes it only
register the backlight device if it can be written. I've just been
sitting on it though because I haven't been able to get anyone with a
read/write backlight interface to test it. If you'd be willing to help
with testing then I can work on getting that patch into the kernel, then
I wouldn't object to your patch.

Seth

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