915gm/945gm/XAA lockup with gray blocks when switching video mode

Keith Packard keithp at keithp.com
Sat Oct 13 02:14:46 PDT 2007

On Fri, 2007-10-12 at 05:58 -0700, Jesse Barnes wrote:

>  The latter might be due to the associated pipe being off, 
> which would disable the registers, possibly causing a GPU crash when 
> you wrote them (the fact that your crashes go away 100% points to this 
> possibility).  

Yeah, the docs say we're not supposed to write the palette when the pipe
is off.

I think turning the pipe on to save and restore the palette is a
reasonable idea; it's not that hard as we don't need any plane connected
to the pipe, just to have the clock running. That should just be a few
register writes.

keith.packard at intel.com
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