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

[Chris Bagwell <chris@cnpbagwell.com>]

On Wed, Apr 14, 2010 at 11:40 AM, Matthew Garrett <mjg59@srcf.ucam.org> wrote:
> On Wed, Apr 14, 2010 at 05:23:22PM +0100, Alan Jenkins wrote:
>
>> I suggest you contact the ACPI video maintainer, Zhang Rui
>> <rui.zhang@intel.com>, and attach the output of "dmidecode".  The best
>> way would probably be to report the problem on bugzilla.kernel.org (on
>> the ACPI video driver).

Thanks for pointers.  Its sometimes difficult to know were to ask for
help.  I found two bugzilla reports that are related:

Mentions exact bug that I'm seeing but doesn't document the
acpi_backlight=vendor work around.  I've added my information to it:

https://bugzilla.kernel.org/show_bug.cgi?id=15182

Similar issue reported by an HP Mini and a 1005P user:

https://bugzilla.kernel.org/show_bug.cgi?id=15532

>>
>> I think it will indeed be possible to blacklist your machine, because
>> someone has already anticipated this problem :-).
>
> dmi blacklisting is almost certainly wrong. It's more likely that
> eeepc-laptop shouldn't be registering a backlight if
> acpi_video_backlight_support() is true, but we'll then want to
> investigate whether we also need to send the keyboard events through.

Does the acpi-video logic not have logic on its own to send key
events?  So I guess laptops that don't have custom modules to handle
this type of stuff don't get visual feedback from gnome-power-manager?

The visual indication is very nice to have although its a "feature"
that today the event isn't making it to gnome-power-manager.  If it
got involved, it would probably write to the /sys/* interfaces and I'd
get the non-linear brightness changes even for Fn-* changes.  If ACPI
video driver can be fixed to stop non-linear part then I'd like to
have the events somehow.

If you guys think letting key event go threw is correct behavior then
I may be able to provide a patch to eeepc-laptop for this.

Chris
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