Re: [Acpi4asus-user] 1005PE's and backlight controls

[Corentin Chary <corentin.chary@gmail.com>]

On Wed, Apr 14, 2010 at 3:24 PM, Chris Bagwell <chris@cnpbagwell.com> wrote:
> On Wed, Apr 14, 2010 at 1:16 AM, Corentin Chary
> <corentin.chary@gmail.com> wrote:
>> On Wed, Apr 14, 2010 at 4:34 AM, Chris Bagwell <chris@cnpbagwell.com> wrote:
>>> Hi all,
>>>
>>> I've seen the following issue reported on various web pages but not sure if
>>> it was directly reported.  First up, you guys know about issue with acpi_osi
>>> of "Windows 2009" disables eeepc_backend and thats were eeepc_wmi comes in.
>>>
>>> There is a secondary bug though if you boot with acpi_osi="!Windows 2009"
>>> (or "Linux").  The ACPI driver will take control of backlight controls with
>>> Fn-F5/F6.  Those keys will work but has issues with Gnome and other user
>>> processes.
>>>
>>> Anything that uses any of the /sys/* interfaces to control backlight do not
>>> work correctly.  When software cycles threw levels, the behavior is kinda
>>> odd.  It will cycle each time you dim to something like
>>> Bright->Dim->Bight->Off->Bright->etc.  Also, Gnome will give no feedback
>>> because eeepc_laptop discards the events and it will not make it to
>>> /dev/input/event*.  And last, the status of current brightness is never
>>> updated under /sys/* correctly which confuses Gnome as well.
>>>
>>> The secondary work around is to add acpi_backlight=vendor to boot options.
>>> Then eepc_backlight takes charge and life is good.  Gnome gives visual
>>> feedback and dimmer works as expected.
>>>
>>> Baring a firmware fix from Asus, would it be possible to enable some sort of
>>> backlist for using ACPI backlight support and have 1005P's use eeepc_laptop?
>>>
>>> Chris
>>
>> Hi,
>> Did you try the eeepc-wmi ? It's the long term solution and it don't need
>> any extra kernel parameters. Yong Wang just added backlight support to it.
>>
>> http://git.kernel.org/?p=linux/kernel/git/mjg59/platform-drivers-x86.git;a=shortlog;h=refs/heads/for_linus
>>
>
> I havent't tried it yet but it looks like it has same issue that
> eeepc-laptop does.  If ACPI reports it handles backlight then
> eeepc-wmi disables controlling of backlight and I'd get buggy ACPI
> version.
>
> Does Yong happen to be on this email list?

I don't think, but he reads platform-x86 which is now CCed

Are you sure that the backlight behavior is the same with and without
acpi_osi=Linux ?


-- 
Corentin Chary
http://xf.iksaif.net
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