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    Subject[15/87] drm/i915: Fix calculation of backlight value in combined mode
    2.6.37-stable review patch.  If anyone has any objections, please let us know.


    From: Takashi Iwai <>

    commit ba3820ade317ee36e496b9b40d2ec3987dd4aef0 upstream.

    [The upstream commit above is a combination of revert + one-liner fix.
    This patch contains only the latter that is needed for 2.6.37.x.]

    This patch fixes the backlight level calculation for combination mode
    used in some models like GM45. It's due to a wrong bit shift
    introduced by the commit a95735569312f2ab0c80425e2cd1e5cb0b4e1870
    drm/i915: Refactor panel backlight controls


    Signed-off-by: Takashi Iwai <>
    drivers/gpu/drm/i915/intel_panel.c | 1 -
    1 file changed, 1 deletion(-)

    --- a/drivers/gpu/drm/i915/intel_panel.c
    +++ b/drivers/gpu/drm/i915/intel_panel.c
    @@ -176,7 +176,6 @@ u32 intel_panel_get_backlight(struct drm
    val &= ~1;
    pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
    val *= lbpc;
    - val >>= 1;

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