On Tue, 8 Jan 2002, Paul wrote:
> Hi,
>
> I'm using XFree86 4.0.3 with DGA (using the SDL API) and have noticed that
> once every now and then (random intervals for up to five minutes) that the
> screen will show _one_ frame that is not in the correct position. It's very
> quick and hard to see but it appears to be shifted lower and to the left or
> right. Is this a problem with the driver? I'm using the NV driver that
> comes with X and don't wish to use the nVidia binary driver.
>
> Can anyone shed any light on this? (I'm using an AGP GeForce 2MX card and
> have tried others with the same results)
The start address is split over many CRTC registers. I suppose
there could be problems making the address change atomic due to that.
Newer chips have an alternate register to program this stuff.
I'll look at using that instead.
Mark.
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