| From | Greg Kroah-Hartman <> | Subject | [ 085/103] drm/radeon: add backlight quirk for hybrid mac | Date | Tue, 23 Jul 2013 15:26:36 -0700 |
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3.10-stable review patch. If anyone has any objections, please let me know.
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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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/gpu/drm/radeon/atombios_encoders.c | 7 +++++++ 1 file changed, 7 insertions(+)
--- 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 r 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;
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