[Intel-gfx] [PATCH] Dont use hardware acceleration on Sandybridge rev 07 hardware or earlier.

Chris Wilson chris at chris-wilson.co.uk
Sun Nov 21 10:03:05 CET 2010

On Sat, 20 Nov 2010 19:59:34 -0800, Keith Packard <keithp at keithp.com> wrote:
> On Sat, 20 Nov 2010 16:17:40 +0100, Matthias Hopf <mhopf at suse.de> wrote:
> > I know, I know. The patch is (one of) the results of the Novell-HP-Intel
> > workshop in Taipei this week. It turned out that rev07 is too unstable.
> > Keith and Eric can probably comment on this. Better than I can.
> There's a work-around in the kernel for pre rev-8 hardware that ensures
> every time the blt ring is advanced by the CPU, the first command
> executes a batch buffer. So the hardware is obviously quite broken.
> This workaround doesn't work perfectly, and the GPU will still lock up
> when executing commands out of the blt ring from time to time. As pre
> rev-8 hardware is all pre-production, the workarounds should be removed
> From the driver and all acceleration disabled.

Ah ha! If it's the BLT workaround, then yes that can die in a very hot
fire. Thanks for the explanation.

Chris Wilson, Intel Open Source Technology Centre

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