[PATCH AUTOSEL 6.4 10/13] ACPI: video: Add backlight=native DMI quirk for Apple iMac12,1 and iMac12,2

Sasha Levin
2023-09-08T18:17:29Z

From: Hans de Goede <hdegoede@redhat.com>

[ Upstream commit 8cf04bb321f036dd2e523e993897e0789bd5265c ]

Linux defaults to picking the non-working ACPI video backlight interface
on the Apple iMac12,1 and iMac12,2.

Add a DMI quirk to pick the working native radeon_bl0 interface instead.

Link: https://gitlab.freedesktop.org/drm/amd/-/issues/1838
Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2753
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/acpi/video_detect.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index 922a31857397c..1244cf9582886 100644
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -495,6 +495,24 @@ static const struct dmi_system_id video_detect_dmi_table[] = {
DMI_MATCH(DMI_PRODUCT_NAME, "iMac11,3"),
},
},
+ {
+ /* https://gitlab.freedesktop.org/drm/amd/-/issues/1838 */
+ .callback = video_detect_force_native,
+ /* Apple iMac12,1 */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "iMac12,1"),
+ },
+ },
+ {
+ /* https://gitlab.freedesktop.org/drm/amd/-/issues/2753 */
+ .callback = video_detect_force_native,
+ /* Apple iMac12,2 */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "iMac12,2"),
+ },
+ },
{
/* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
.callback = video_detect_force_native,
--
2.40.1