[Intel-gfx] Sandy Bridge issue: 3d clipped to window offset (0, 0)

[Lindsay Roberts]

On Tue, Jan 11, 2011 at 9:48 PM, Chris Wilson <chris at chris-wilson.co.uk> wrote:
>> 3D draws, but the only part of the drawn content I see is the
>> intersection of the actual current window content rect and the
>> rectangle from (0, 0) to the width and height of the window at
>> creation time. Any changes to the position or size of a GL window do
>> not change this clipped boundary, although the actual content is
>> offset and/or scaled correctly (but still clipped).
>
> That sounds reminiscent of a bug the shadow+dri code has. Check that it is
> not falling back to using software 2D and is able to use the BLT engine.

Thanks Chris, I can confirm this was the issue. Once I disabled the
(pci.revision < 7) check in the X driver for BLT the issue was fixed.

Chris, Nanhai, do you want me to file a bug against the shadow code
path, or is this enough a known issue?

- Lindsay