On Thursday 13 May 2010 12:33:57 am akpm@xxxxxxxxxxxxxxxxxxxx wrote:
> From: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
>
> Make "acpi_backlight=video" param enable ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO
> as intended, instead of incorrectly enabling video output switching.
IIRC the only native driver which takes over backlight switching is panasonic,
because Len saw 2 brightness steps missing.
This one should have been solved by a "compatibility" patch from Rui and
this one could also use video.ko by default.
Still, this one is a safe fix.
Just in case someone wants to avoid the use of this boot param and get
things done right by default (and likes to send a patch for it :)).
Thomas
> Addresses http://bugs.launchpad.net/bugs/573120
>
> Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
> Cc: Len Brown <lenb@xxxxxxxxxx>
> Cc: Zhang Rui <rui.zhang@xxxxxxxxx>
> Cc: Bjorn Helgaas <bjorn.helgaas@xxxxxx>
> Cc: Jiri Kosina <jkosina@xxxxxxx>
> Cc: <stable@xxxxxxxxxx>
> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> ---
>
> drivers/acpi/video_detect.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff -puN drivers/acpi/video_detect.c~acpi-video-fix-acpi_backlight=video
> drivers/acpi/video_detect.c ---
> a/drivers/acpi/video_detect.c~acpi-video-fix-acpi_backlight=video +++
> a/drivers/acpi/video_detect.c
> @@ -250,7 +250,7 @@ static int __init acpi_backlight(char *s
> ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR;
> if (!strcmp("video", str))
> acpi_video_support |=
> - ACPI_VIDEO_OUTPUT_SWITCHING_FORCE_VIDEO;
> + ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO;
> }
> return 1;
> }
> _
> --
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