Re: [PATCH 2/2] Video Extension patch

[Andrew Barr <barr.156-ZbGKxL/pcrQ@public.gmane.org>]

On Thu, 2004-08-26 at 06:21, Yu, Luming wrote:
> All,
> Since Bruno Ducrot <ducrot-kk6yZipjEM5g9hUCZPvPmw@public.gmane.org> has implemented acpi video
> extension filed at bug 1944.
> I made some improvement against his code. 
> 
> The patch [1/2] posted here is the original implementation of video
> extension written by Bruno Ducrot <ducrot-kk6yZipjEM5g9hUCZPvPmw@public.gmane.org> .
> The patch [2/2] posted here is my patch on top of the patch [1/2]. 
> Please give it a review, and have it a try.
> 
> Thanks 
> Luming

Hello,

I have a Dell Insprion 300m notebook with an Intel 855GM integrated
graphics device. I gave the video extensions code a try, primarily with
an interest in brightness control from userspace (for example, lowering
brightness at a certain battery level). Right now, the brightness keys
(Fn+Up/Down Arrow) are caught by the BIOS and work without any extra
code in the kernel. There are two problems for me right now: first,
brightness control is not effective. Doing:

root@dell-laptop /home/abarr/tmp # echo 40 >
/proc/acpi/video/GFX0/LCD/brightness
root@dell-laptop /home/abarr/tmp # cat
/proc/acpi/video/GFX0/LCD/brightness
levels:  80 60 0 20 40 60 80 100
current: 40

will change the current value, as you can see, but it does not change
the brightness value for my screen. Second, pressing the brightness
control buttons with the video extensions patch applied causes a loss of
keyboard input. The mouse will work, but both internal and external
keyboards are dead after using those keys. BIOS-trapped keys such as
brightness and CRT/LCD still work. I do get a video event in
/proc/acpi/event when I press the CRT/LCD switch key.

Now, I realize that this code is new and experimental. I'm just hacking
around here, and if anyone gets a chance to help me out I'd greatly
appreciate it.

Andrew



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