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@xxxxxxxxxx> --- 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 18cc08c858cf..7cceaf31d928 100644 --- a/drivers/acpi/video_detect.c +++ b/drivers/acpi/video_detect.c @@ -486,6 +486,24 @@ 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, -- 2.41.0
