Commit 364438fd authored by Nicholas Bishop's avatar Nicholas Bishop Committed by Alex Deucher
Browse files

drm/radeon: Fix backlight control on iMac 12,1 

The iMac 12,1 does not use the gmux driver for backlight, so the radeon
backlight device is needed to set the brightness.

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1838


Signed-off-by: default avatarNicholas Bishop <nicholasbishop@google.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
parent 9c4f59ea

drivers/gpu/drm/radeon/atombios_encoders.c

+2 −1
Original line number Diff line number Diff line
@@ -198,7 +198,8 @@ void radeon_atom_backlight_init(struct radeon_encoder *radeon_encoder, 
	 * so don't register a backlight device

	 */

	if ((rdev->pdev->subsystem_vendor == PCI_VENDOR_ID_APPLE) &&

	    (rdev->pdev->device == 0x6741))

	    (rdev->pdev->device == 0x6741) &&

	    !dmi_match(DMI_PRODUCT_NAME, "iMac12,1"))

		return;



	if (!radeon_encoder->enc_priv)