I cannot get X working with the latest Mainline build for Lucid (2.6.35-rc1-lucid [1]) nor with linux-image-generic-lts-backport-maverick (which I figured I’d also try, as it’s also a build of 2.6.35). Both end with ”[drm] failed to open device” and ”No devices detected” in the log (I’ll attach one to this comment).

If I’m interpreting Nouveau Wiki’s Troubleshooting document [2] and the logs correctly, KMS is working (fb0 is there), which means there’s ”a version mismatch between the Nouveau DRM and libdrm”. Any help there would (also) be appreciated.

*[1] http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.35-rc1-lucid/
*[2] http://nouveau.freedesktop.org/wiki/TroubleShooting#Xorg_fails_to_start_with_.22.28EE.29_.5Bdrm.5D_failed_to_open_device.22