[Intel-gfx] Partial success - Fixing resume from s2ram on S6010

[Thomas Richter]

Am 09.06.2014 13:08, schrieb Ville Syrjälä
> No, we do restore the mode you were using before suspend.
>
> Are you still using vbetool? That would explain why things go bad since
> vbetool will clobber whatever i915 already did.

No, vbetool is out of the equation (see the script attached to the 
previous post). However, I dumped the 830MG register set
and the ns2501 DVO set before and after the suspend, and they are pretty 
different. As said, the 830 is configured
to use a 640x480 mode (instead of the 1024x786 mode) and the DVO is off.

Maybe the kernel tries to mode-detect the connected monitor, and this 
fails because the PLLs are not yet
configured correctly? Note that the ns2501 requires a correctly 
configured DVO to be able to respond on
the i2c bus. If so, mode-detection requires configuring the PLLs to 
*some* useful mode before attempting
to detect anything, otherwise the DVO just plays "dead".

Greetings,
     Thomas