Re: [Gnewsense-dev] Linux-libre 2.6.30.9

[Wu Zhangjin]

On Tue, 2009-11-03 at 15:24 +0800, Wu Zhangjin wrote:
> Hi,
> 
> [...]
> > > - When you press Fn + F2 now, the screen actually shuts off. Before it
> > > seemed as if it just blackened it and put the brightness on lowest point.
> > > 
> > 
> > Yup, this is a known problem, I only found it when with the new EC
> > version(such as PQ1D26, please check the version via
> > "cat /proc/cmdline"). I have tried to resume the brightness in the
> > kernel when resuming from Fn + F2, but it not works. So, perhaps EC does
> > some BAD jobs there, will check it later and will try to fix it in
> > kernel space.
> 
> Seems the latest EC shut the backlight off when Fn + F2 is pressed, and
> if we do it in kernel again, it fails to resume the original brightness,
> even if I save/restore the original brightness manually.
> 
> (This is exactly an interface problem between EC and Kernel)
> 
> Just "fixed" it via avoiding shutting the backlight off again in kernel.
> but Fn + F2 will not work for the users who are using the old ECs.

A better solution is checking the version of EC and then doing
corresponding job.

> 
> Regards,
>       Wu Zhangjin