6.10-stable review patch. If anyone has any objections, please let me know.
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From: Esther Shimanovich eshimanovich@chromium.org
[ Upstream commit 7dc918daaf2994963690171584ba423f28724df5 ]
It used to be that the MacbookPro9,2 used its native intel backlight device until the following commit was introduced:
commit b1d36e73cc1c ("drm/i915: Don't register backlight when another backlight should be used (v2)")
This commit forced this model to use its firmware acpi_video backlight device instead.
That worked fine until an additional commit was added:
commit 92714006eb4d ("drm/i915/backlight: Do not bump min brightness to max on enable")
That commit uncovered a bug in the MacbookPro 9,2's acpi_video backlight firmware; the backlight does not come back up after resume.
Add DMI quirk to select the working native intel interface instead so that the backlight successfully comes back up after resume.
Fixes: 92714006eb4d ("drm/i915/backlight: Do not bump min brightness to max on enable") Signed-off-by: Esther Shimanovich eshimanovich@chromium.org Reviewed-by: Hans de Goede hdegoede@redhat.com Link: https://patch.msgid.link/20240806-acpi-video-quirk-v1-1-369d8f7abc59@chromiu... [ rjw: Subject and changelog edits ] Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/acpi/video_detect.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c index 674b9db7a1ef8..75a5f559402f8 100644 --- a/drivers/acpi/video_detect.c +++ b/drivers/acpi/video_detect.c @@ -549,6 +549,14 @@ static const struct dmi_system_id video_detect_dmi_table[] = { DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir9,1"), }, }, + { + .callback = video_detect_force_native, + /* Apple MacBook Pro 9,2 */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), + DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro9,2"), + }, + }, { /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */ .callback = video_detect_force_native,