Comment 19 for bug 88905

Catchit, you shouldn't even be doing all the things you do to fix it. This is a major bug that Ubuntu has shipped with, and they should have been the ones that fixed it within a week that this bug was confirmed. But they didn't. So, don't bother and just wait for a fix.

However, if you want to continue trying, something is wrong with your xorg setup, maybe you haven't dri/gl loaded on your xorg.conf. There is no other explanation if you have taken all the right steps to recompile the drm driver. I have a T23 too and it works. If it still doesn't for you, check your xorg to make sure you enable all the extensions needed.