Commit 80101790 authored Jun 10, 2013 by Alex Deucher

drm/radeon: add backlight quirk for hybrid mac

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>
Cc: stable@vger.kernel.org

parent f100380e

drivers/gpu/drm/radeon/atombios_encoders.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -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;

Admin message