[Bug 512567] Re: hotkeys adjust brightness non-monotonically on EEEPC 1005PE

[Swâmi Petaramesh]

On Asus EeePC 1005PE, BIOS version: 0901 (03/04/2010), Kubuntu Lucid
Beta 1, KDE environment :

- With "normal" default boot command, LCD brigthness keys [Fn]-[F5] and
[Fn]-[F6] behave completely erratically, which is a real pain.

- Booting with "acpi_osi=Linux", LCD brigthness keys behave properly (in a linear fashion) but it seems that KDE doesn't get information about brightness, i.e. LCD brigthness key don't result in a "level bar" appearing on screen when used.
- Also "cat /proc/acpi/video/VGA/LCDD/brightness" shows a "current" level that doesn't change even when brightness is actually modified by use of the hotkeys.

- Booting with "acpi_osi=Linux acpi_backlight=vendor" options as BlackSir suggests (thanks BlackSir !) make both LCD brigthness keys behave properly (in a linear fashion) and now KDE is aware of them (using the hotkeys now make the "brightness level bar" pop-up on screen).
- OTOH I now have :
# cat /proc/acpi/video/VGA/LCDD/brightness
<not supported>

But I guess I don't care about that "<not supported>" as long as
everything now actually works ;-)

-- 
hotkeys adjust brightness non-monotonically on EEEPC 1005PE
https://bugs.launchpad.net/bugs/512567
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