I have a xrandr setup with the laptops internal screen at 1280x800 and the external screen at 1680x1050 on 965gm. I can get a composited desktop using aiglx with either KWin of KDE4 or Compiz, however single windows larger than 2048 pix wide will: - turn completely black in KWin - only be partly rendered in Compiz This especially makes the desktop background unusable, as it is just black with KWin and only shown up to *about* the center of the external screen in Compiz. Is this a known issue? Thnx!! :-)
All 3D hardware we've seen to date has limits on the size of textures it can handle. For intel, that's 2048x2048 (it's a bit larger for 965, but we quickly run into mesa limitations). OpenGL exposes these texture size limits to the application. However, compiz doesn't work around the texture size limits like it should, and instead renders garbage. Kwin is probably doing the same.
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