https://bugzilla.kernel.org/show_bug.cgi?id=221433
Bug ID: 221433
Summary: MacBookPro11,1 backlight wrong after wake
Product: ACPI
Version: 2.5
Hardware: Intel
OS: Linux
Status: NEW
Severity: low
Priority: P3
Component: Power-Video
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Same family of bug as commit 7dc918daaf29 (MacBookPro9,2) and commit
295991836b23 (MacBookPro11,2) — ACPI/i915 backlight state desync on this
firmware. On this machine the symptom is: brightness is wrong after DPMS resume
(slider shows e.g. 95%, but panel real visibly is much dimmer), nudging the
slider one step fixes it.
Confirmed acpi_backlight=native fully resolves it on MacBookPro11,1.
Possible fix: add to video_detect_dmi_table[] in drivers/acpi/video_detect.c:
<pre>
{
.callback = video_detect_force_native,
/* Apple MacBook Pro 11,1 */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro11,1"),
},
},
</pre>
DMI strings verified via dmidecode. Tested on Debian 6.1.0-44.
References:
7dc918daaf29 ACPI: video: force native for Apple MacbookPro9,2
295991836b23 ACPI: video: force native for Apple MacbookPro11,2 and Air7,2
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