Update: all is fine, I've just received my answer. Just in case you ever need to contact 'em, it does work.
Exactly two weeks ago I filed some sort of bug report to devrel 'at' powervr.com, seemingly the proper target after looking at the site.
And I haven't heard back
What's the most successful way of filing bugs with the Kyro people, if you've made any such experience?
If you're so inclined, the bug relates to drawpixels calls with dimensions >1024 pixels. Tested on a windowed glut app, that nicely resizes its viewport in the reshape callback and does full viewport 'blits' in the display callback.
If any viewport dimension is greater than 1024 units, the window goes black (I don't even call glClear!).
It works just fine on Radeons from R100 through R300, NV10 through NV25 and Matrox G400/Parhelia (these are the ones I tested myself or had positive reports about).
[This message has been edited by zeckensack (edited 04-29-2003).]