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

[Chris Bagwell <chris@cnpbagwell.com>]

On Wed, Apr 14, 2010 at 8:30 PM, Zhang Rui <rui.zhang@intel.com> wrote:
> On Thu, 2010-04-15 at 06:18 +0800, Chris Bagwell wrote:
>> On Wed, Apr 14, 2010 at 12:26 PM, Matthew Garrett <mjg59@srcf.ucam.org> wrote:
>> > On Wed, Apr 14, 2010 at 12:14:04PM -0500, Chris Bagwell wrote:
>> >
>> >> 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?
>> >
>> > It does, but it's dependent upon the firmware sending them.
>>
>> I think the following tells me firmware is sending them.  If I leave
>> acpi_osi="Windows 2009" so that eeepc_laptop doesn't get loaded, I see
>> events like this on /pro/acpi/event:
>>
>> video LCDD 00000087 00000000
>> video LCDD 00000087 00000000
>> video LCDD 00000086 00000000
>> video LCDD 00000086 00000000
>>
>> Thats a couple decreases followed by a couple increases.
>>
> I have a EEEpc 1005PE. I'm looking at the backlight problem on this
> machine, but it seems to be different from this one.
>
> The hotkey seems to work perfectly when ACPI video driver is loaded.
> i.e. I get a single hotkey event when pressing the hotkey and the value
> of /sys/class/backlight/acpi_video0/brightness changes correctly.
>
> The only problem I get is that the actual brightness does not change
> consistently.
> say, there are 15 brightness levels in all,
> level 0, level 5 and level 12 give me a screen with lowest brightness.
> If I want to get maximum backlight, I need to set it to level 4 or level
> 11.

If I do not set acpi_backlight=vendor and then change brightness by
writing to above /sys/* link this is same behaviour I see as well.  If
I use Fn-F5 and Fn-F6, I do not see the issue (brightness increments
linearly).  I believe thats because events are not sent to
/dev/input/event* and so software (gnome-power-manager) is never
notified and won't wrote to /sys/*.  If I launch power manager
preferences and change brightness then I do see issue.

In this case, I'm using Fedora 13 beta's kernel 2.6.33.2-41.

>
> could you tell me your BIOS version please?

Yesterday, I was running 0901 and today I'm running 1003.  Same
behaviour in both cases.
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