From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Kamal Mostafa To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Alex Deucher , Kamal Mostafa Subject: [PATCH 094/145] drm/radeon: add backlight quirk for hybrid mac Date: Wed, 17 Jul 2013 15:47:06 -0700 Message-Id: <1374101277-7915-95-git-send-email-kamal@canonical.com> In-Reply-To: <1374101277-7915-1-git-send-email-kamal@canonical.com> References: <1374101277-7915-1-git-send-email-kamal@canonical.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.8.13.5 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Alex Deucher 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 Signed-off-by: Kamal Mostafa --- 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