[GMA500] Valid VCO frequency range on GMA500 platform?

[Patrik Jakobsson]

On Fri, Feb 8, 2013 at 2:51 PM, "David Müller (ELSOFT AG)"
<d.mueller at elsoft.ch> wrote:
>
> Hello
>
> I have a problem using a 1024x768 Eizo Monitor attached by DVI-D to a
> system with GMA500 based graphics and running under Linux-3.7.
>
> As soon as the GMA500 driver is taking over control, the refresh
> rate raises to 64.5Hz and the monitor reports a "signal error".
>
> For me i looks like the GMA500 driver is reprogramming the VCO to a too
> high dot clock. If i lower the "I9XX_VCO_MIN" value to 1300000,
> everything is fine.
>
> Is the "I9XX_VCO_MIN" value used in the GMA500 driver correct?
>
>
> Dave

Hi Dave
The value of VCO_MIN comes from the Intel PRM for similar GPUs.

Instead of changing VCO_MIN, could you try setting N_MIN=1, N_MAX=6 and
M1_MAX=22? I'll test it on my own hardware tomorrow.

-Patrik