Re: Input Brightness events on EeePc 1201HA

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

CCing linux-acpi and Zhang Rui.

>> - Does brightness react to keypress (up and/or down) in grub ? windows
>> ? linux wihout X ?
>
> It does not work in GRUB for an unknown reason but I have "good" news
>
> It works in Linux, without using video (which can not manage this
> machine), until psb driver is loaded and creates a backlight device
> using PWM!

Looking at the dsdt:

                        Method (STBR, 0, Serialized)
                        {
                            If (And (^^^GFX0.TCHE, 0x02))
                            {
                                ISMI (0x7A)
                                ^^^GFX0.AINT (One, PAR0)
                            }
                            Else
                            {
                                ISMI (0x78)
                            }
                        }

ISMI (0x78) is the working path, so when psb load, And (^^^GFX0.TCHE,
0x02) become true,  Maybe in this case the psb driver should do
something that it doesn't.

A quick workaround would be to send input events in eeepc-laptop if
GFX0.TCHE & 0x2, but does not sound pretty.

> Unfortunately I can't think of a solution for machines using psb except
> disabling backlight handling there.
>
> It would either conflict (2 backlights device, on in psb, the other in
> eeepc-laptop/wmi) or have keys not handled (as both would not handle
> them if they do not handle backlight)



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