[Intel-gfx] New Samsung driver for backlight control.

[Mike Lothian]

2009/9/9 Greg KH <greg at kroah.com>:
> On Wed, Sep 09, 2009 at 01:04:15PM +0200, Matthias Hopf wrote:
>> On Sep 08, 09 09:31:24 -0700, Greg KH wrote:
>> > > AFAIR at one point you deliberately decided to expose only 8 levels to
>> > > the user - while the hardware was capable of more levels (I think it was
>> > > something about some user land tool expecting something like that).
>> > > But I may be utterly wrong.
>> >
>> > Yes, that was when we were blindly poking in the PCI config space.  We
>> > aren't supposed to be doing that :)
>> >
>> > > I'd love to have more fine grained control on my NC10 as well.
>> >
>> > I have reports that Windows also only supports 8 levels, so that is what
>> > this hardware controller is possible of supporting, sorry.
>>
>> Hm. This is contradicting. On the one hand the hardware is capable of
>> more levels. On the other it isn't *reporting* more levels.
>>
>> I wouldn't rely on anything what Windows supports. There can be
>> arbitrary limitations in the driver.
>
> The hardware seems to allow multiple levels if you poke a raw value into
> a random PCI config location.
>
> However, this is not the correct way to control this hardware, a SMI
> call needs to be made instead.  And for that call, only 8 levels are
> available.
>
> So it's not a limitation in the Windows driver, it is a limitation in
> the BIOS provided by the manufacturer.
>
> thanks,
>
> greg k-h
>

Who's the best person to talk to about getting my laptop added to

drivers/input/keyboard/atkbd.c

To stop the stuck keys

Cheers

Mike