[Nouveau] [Bug 54700] Distorted graphics (double cursor) with GeForce 4200Go (NV28)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=54700

--- Comment #35 from Emil Velikov <emil.l.velikov at gmail.com> ---
(In reply to comment #34)
> > As mentioned it seems like the tiling (pitch) is misset by ~64 (after a quick
> > look at the attached picture)
> 
> I'll look around for a doc to understand what you're saying...
> 
My knowledge is kinf of flacky in the area, so here is the way I understand it.
Gpus do not always treat and/or use memory on a linear way. It may be handled
as a tile with certain dimensions

> > Can you do try and establish if the issue happens in or outside of X, and in
> > which cases
> 
> what do you mean by outside X? Framebuffer terminal seemed ok, how can I
> show a graphic without X?
> 
Yes I meant the framebuffer. Not sure of many ways to draw stuff on it -
directFB is project that normally deals with such things [1]. My main point is
to understand if the issue is xf86-video-nouveau or libdrm/kernel related

> >i.e. in X only when drawing an image of dimensions x1 & y1, or
> > less than x2 & greater than y2
> 
> You mean rescaling a single image or showing images of different pixel size?
> 
> And you really mean drawing (e.g. with office draw) or just showing existing
> images?
> 
I meant rendering images of different sizes. Looking at the iceweasel.png at
bugs.debian.org indicates not everything rendered exhibits the distortion -
would be great to know something specific about the files causing it

Simple tests
* grab the ice weasel picture, open it in a image viewer (and/or browser) -
distorted ?
* rescale the image (using gimp or other software), reopen the picture and
observe.
* same for the cursor file

Cheers
Emil


[1] http://www.directfb.org/docs/DirectFB_Tutorials/image.html

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