Attachment 80624 Details for Bug 65377 – don't register a radeon backlight

[patch] don't register a radeon backlight

0001-drm-radeon-add-backlight-quirk-for-hybrid-mac.patch (text/plain), 1.30 KB, created by Alex Deucher on 2013-06-10 14:01:43 UTC

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Creator: Alex Deucher

Created: 2013-06-10 14:01:43 UTC

Size: 1.30 KB

patch

obsolete

>From 03ba2caa272a62eb1d9799359ea7690ee8e2f158 Mon Sep 17 00:00:00 2001
>From: Alex Deucher <alexander.deucher@amd.com>
>Date: Mon, 10 Jun 2013 09:57:07 -0400
>Subject: [PATCH] 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
>---
> drivers/gpu/drm/radeon/atombios_encoders.c |    7 +++++++
> 1 files changed, 7 insertions(+), 0 deletions(-)
>
>diff --git a/drivers/gpu/drm/radeon/atombios_encoders.c b/drivers/gpu/drm/radeon/atombios_encoders.c
>index 8406c82..4120d35 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;
> 
>-- 
>1.7.7.5
>

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