https://bugzilla.kernel.org/show_bug.cgi?id=19342
Summary: ACPI video backlight control doesn't work -- need
backlight manager
Product: ACPI
Version: 2.5
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
AssignedTo: acpi_power-vi...@kernel-bugs.osdl.org
ReportedBy: rui.zh...@intel.com
Regression: No
the ACPI video backlight control doesn't work on some machines. i.e. the
backlight control method is evaluated properly but the backlight is not
actually changed.
For these machines, we need to control the backlight via other ways, like,
platform driver, PCI legacy register, graphics native register, etc.
So I'm planning to re-write the backlight sysfs class device to a backlight
manager. More than one backlight driver can register to this backlight manager,
and provide different callbacks to change the backlight.
And we can switch to other drivers if ACPI video driver doesn't work.
Even more, we can setup a blacklist for the laptops that known broken.
In a word, this bug report is a gathering of all the bugs that ACPI backlight
control is broken and we don't/can't fix in Linux/kernel.
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