https://bugzilla.kernel.org/show_bug.cgi?id=56011
Summary: Backlight controls not working properly on Lenovo
Thinkpad Edge e14 (0578A21)
Product: ACPI
Version: 2.5
Kernel Version: 3.9.0-rc4-next-20130328
Platform: All
OS/Version: Linux
Tree: -mm
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
_BQC seems to always return zero making backlight control to not work properly,
i.e. only 2 lower brightness levels are available.
Problem showed up after a bunch of fixes in acpi/video.c:
994fa63c5b126df6e9f31ef4e09000e2e243234b "ACPI / video: Fix applying indexed
initial brightness value."
2d4128a25206685aaccaf14220c8436b11c6dc01 "ACPI / video: Make logic a little
easier to understand."
a89803df9c9b2d023227c48503066a728f1fed36 "ACPI / video: Fix brightness control
initialization for some laptops."
With this commits reverted controls works fine but only because BQC get's
disabled due to invalid value being returned on initial BQC call.
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