My graphics card is integrated ATI Technologies Inc RS485 [Radeon Xpress 1100 IGP] and I'm using the open source radeon drivers from git. When I press the keyboard combination Ctrl+F12 to bring up the Dashboard in KDE 4 (both 4.0 and 4.1 RC1) the screen first goes all white and only then the dashboard shows. What should happen is that the dashboard should slowly fade in. I have desktop effects enabled and I have to use XRender mode as the OpenGL mode doesn't work on this card yet. The XOrg server is version 1.4.2.
This is seems to be a combination of two QT4 issues: 1. QT4 uses 1-Bit alpha masks that can't be accelerated with EXA and this makes the driver to fallback to software rendering to render parts of the content of the dashboard. You see the white window, because plasma (and the driver) hasn't yet finished the rendering of the dashboard content. The fade in animation also uses resources, that makes the dashboard rendering take longer. 2. The composite manager can't wait until the initial window painting has finished, because QT4 doesn't support the _NET_WM_SYNC_REQUEST protocol.
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