i810 problems and questions

Alan Hourihane alanh at fairlite.demon.co.uk
Fri Jul 7 10:09:49 PDT 2006

On Fri, 2006-07-07 at 18:32 +0200, Jan Rychter wrote:
> I've decided to give the new xorg release (7.1) a try in the hope that
> the 855GM in my tablet pc will now be fully supported. And, lo and
> behold, we're almost there!
> Things I've found so far:
> 1. I can get acceleration in normal orientation, which is good.
> 2. It seems I can't get acceleration when rotating the screen
>    CW. Windows move around sluggishly, xterms scroll slower, web pages
>    scroll in a jerky manner. This is how tablet pc users spend 99% of
>    their time, so it's quite important for me. Is this a hardware
>    limitation, or are there plans to improve this? I thought hardware is
>    capable of helping here, as Windows felt quite snappy even when
>    rotated.

There's been a few rotation fixes recently, so you might want to get the
current git repo.

> 3. The i810 driver really doesn't like to start with the "Rotate" "CW"
>    option and DRI. The server fails with
>     (EE) I810(0): [drm] drmAddMap(front_handle) failed. Disabling DRI
>    ... and a SEGV to make it very clear that it doesn't intend to
>    continue. But, things are fine if I start without the rotate option
>    and do a "xrandr -o right" afterwards, so I'm using that as a
>    workaround.

Again, this is fixed in the git repo.

> 4. XVideo works nicely, both in normal and rotated modes. Impressive! I
>    can rotate the screen while a movie is playing!


> 5. DRI still seems to be a no-no. Tried enabling DRM, messages indicate
>    acceleration is available, but glxgears only does 400fps, looks
>    strange (the motion isn't smooth) and the entire machine hangs hard
>    when I click the "close" button on the glxgears window.

Get the latest git repo.


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