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    Subject[PATCH 094/145] drm/radeon: add backlight quirk for hybrid mac
    Date
    3.8.13.5 -stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Alex Deucher <alexander.deucher@amd.com>

    commit 80101790670385a85aca35ecae4b89e3f2fceecc upstream.

    Mac laptops with multiple GPUs apparently use the gmux
    driver for backlight control. Don't register a radeon
    backlight interface. We may need to add other pci ids
    for other hybrid mac laptops.

    Fixes:
    https://bugs.freedesktop.org/show_bug.cgi?id=65377

    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Kamal Mostafa <kamal@canonical.com>
    ---
    drivers/gpu/drm/radeon/atombios_encoders.c | 7 +++++++
    1 file changed, 7 insertions(+)

    diff --git a/drivers/gpu/drm/radeon/atombios_encoders.c b/drivers/gpu/drm/radeon/atombios_encoders.c
    index 6cf2b52..8efd7e2 100644
    --- a/drivers/gpu/drm/radeon/atombios_encoders.c
    +++ b/drivers/gpu/drm/radeon/atombios_encoders.c
    @@ -186,6 +186,13 @@ void radeon_atom_backlight_init(struct radeon_encoder *radeon_encoder,
    u8 backlight_level;
    char bl_name[16];

    + /* Mac laptops with multiple GPUs use the gmux driver for backlight
    + * so don't register a backlight device
    + */
    + if ((rdev->pdev->subsystem_vendor == PCI_VENDOR_ID_APPLE) &&
    + (rdev->pdev->device == 0x6741))
    + return;
    +
    if (!radeon_encoder->enc_priv)
    return;

    --
    1.8.1.2


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