http://bugzilla.kernel.org/show_bug.cgi?id=13210
Summary: General issues with acpi brightness keys on aspire
5720
Product: ACPI
Version: 2.5
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: low
Priority: P1
Component: Power-Video
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Regression: No
In general that notebook has very broken implementation of acpi video
interface.
Thus probably it is best just to use acer-wmi for it, and it does work
perfectly.
But I once noticed that acer-wmi won't load and demand to use generic acpi
video interface. I eventually discovered that, if you don't include acpi video
in the kernel (disabled in config), then it works.
Anyway, I would like to discuss, and probably improve the acpi video driver,
for less broken notebooks (and this probably will involve fixing
gnome-power-manager/hal as well)
Anyway here is the mess I have:
* Hardware controls brightness internally, probably using EC code.
* Yet, it reports brightness keys as normal keyboard keys
* It also reports brightness up/down acpi events, it does so only when acpi
'video' driver is loaded - tested by doing cat /proc/acpi/event.
* Acpi events cause video driver to set brightness, and also report 'em on
separate event interface.
Thus a single (say brightness up) event results in brightness going 4 levels
up:
1 due to hardware change, 1 for acpi video driver automatic chager, 1 by gpm
listening to acpi event device, and finally 1 due to normal keypress.
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