lkml.org 
[lkml]   [2011]   [Oct]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Date
    Subject[PATCH] Platform: Detect samsung laptop quirk when initial level is zero
    From
    From: John Serock <john.serock@gmail.com>

    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@gmail.com>

    ---
    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)

    \
     
     \ /
      Last update: 2011-10-13 12:45    [W:0.020 / U:270.716 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site