backlight control broken on Sony VGN-P21Z with staging/gma500

[Greg KH]

On Wed, Apr 13, 2011 at 09:54:45PM +0200, Joost Pjotr Vermeer wrote:
> Hi,
> 
> I tried the new gma500 driver from staging on my Sony VGN-P21Z. It
> seems to work very nice.
> 
> But backlight control does not work. It has worked with a previous
> version of the staging/gma500 driver. I can solve it by removing the
> call to acpi_video_register() from psb_driver_load() in psb_drv.c.
> 
> Can I try anything to find a more specific cause for this?

Use 'git bisect' to find the offending patch?

thanks,

greg k-h