I'm having a similar problem. I can't enable OpenGL desktop effects anymore after upgrading Mepis 11 to KDE 4.7. It worked in KDE 4.6. Xrender works, pretty well actually, but I'd like to get OpenGL to work. I've already upgraded to the Xorg from the Test CR, and have run sgfxi but without effect.
When enabling OpenGL, KDE says: "Failed to activate desktop effects using the given configuration options. Settings will be reverted to their previous values. Check your X configuration. You may also consider changing advanced options, especially changing the compositing type."
Any ideas on what I could do to get it to work?
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System: Host: hobbes Kernel: 2.6.36-1-mepis-smp i686 (32 bit, gcc: 4.4.5)
Desktop KDE 4.7.4 (Qt 4.7.3) Distro: MEPIS 11.0 squeeze
Machine: System: Hewlett-Packard product: HP ProBook 4310s version: F.0C
Mobo: Hewlett-Packard model: 7015 version: KBC Version 14.10
Bios: Hewlett-Packard version: 68PHT Ver. F.0C date: 01/14/2010
CPU: Dual core Intel Core2 Duo CPU T6670 (-MCP-) cache: 2048 KB flags: (lm nx sse sse2 sse3 sse4_1 ssse3 vmx) bmips: 8779.76
Clock Speeds: 1: 1200.00 MHz 2: 1200.00 MHz
Graphics: Card: Intel Mobile 4 Series Chipset Integrated Graphics Controller bus-ID: 00:02.0
X.Org: 1.10.4 driver: intel Resolution: firstname.lastname@example.org
GLX Renderer: Mesa DRI Mobile Intel GM45 Express Chipset GEM 20091221 2009Q4 x86/MMX/SSE2 GLX Version: 2.1 Mesa 7.7.1 Direct Rendering: Yes