On 13/10/11 9:42 PM, John Serock wrote:
> From: John Serock <john.serock@xxxxxxxxx>
>
> This patch depends on the "Platform: Brightness quirk for samsung
> laptop driver" patch from Jason Stubbs. This patch adds a check for an
> initial brightness level of 0; if the level is 0, this patch changes
> the brightness level to 1 before the driver attempts to detect the
> brightness quirk.
>
> The Samsung N150 netbook experiences the brightness quirk. Without
> Jason's patch, the only brightness levels available on the N150 are 0,
> 1, and 8. This patch ensures that, when the initial brightness level
> is 0, the samsang-laptop driver detects the brightness quirk on the
> N150, thereby making brightness levels 0 through 8 available.
>
> Signed-off-by: John Serock <john.serock@xxxxxxxxx>
>
> ---
> diff -uprN a/drivers/platform/x86/samsung-laptop.c
> b/drivers/platform/x86/samsung-laptop.c
> --- a/drivers/platform/x86/samsung-laptop.c 2011-10-12 13:51:15.030779179 -0400
> +++ b/drivers/platform/x86/samsung-laptop.c 2011-10-12 13:51:32.746867045 -0400
> @@ -404,8 +404,9 @@ static int get_brightness(struct backlig
>
> static void check_for_stepping_quirk(void)
> {
> - u8 initial_level = read_brightness();
> + u8 initial_level;
> u8 check_level;
> + u8 orig_level = read_brightness();
>
> /*
> * Some laptops exhibit the strange behaviour of stepping toward
> @@ -414,6 +415,11 @@ static void check_for_stepping_quirk(voi
> * around in set_brightness.
> */
>
> + if (orig_level == 0)
> + set_brightness(1);
> +
> + initial_level = read_brightness();
> +
> if (initial_level <= 2)
> check_level = initial_level + 2;
> else
> @@ -427,7 +433,7 @@ static void check_for_stepping_quirk(voi
> pr_info("enabled workaround for brightness stepping quirk\n");
> }
>
> - set_brightness(initial_level);
> + set_brightness(orig_level);
> }
>
> static int update_status(struct backlight_device *bd)
Acked-by: Jason Stubbs <jasonbstubbs@xxxxxxxxx>
Thanks!
Regards,
Jason Stubbs
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