I just upgraded two versions of Ubuntu to Oneiric after a recent set of updates broke Audacious 2.4.something in Maverick for me. When it was all finished my Asus Eee 1215N with the 1366x768 screen and the notoriously unsupported Nvidia Ion2 with Optimus chipset was working on minimum compatibility fallbacks at 1024x768 resolution (probably on only the Intel part). So I did a little bit of reading (not enough) and tried deleting a couple parts of the graphics system to see if I could force a retry on the autodetection.
The result: No graphical shell works now.
Attempted so far:
-reinstalling xorg/nouveau drivers, didn't work but perhaps I read the wrong instructions.
-installing bumblebee/nvidia-current (followed the directions), didn't work.
-sudo dpkg-reconfigure -phigh -a, it didn't take as long as it probably should have but didn't work.

Right now I'm looking at what it takes to disable the splash screens, which do still work, so that I can hopefully diagnose my error messages; if someone knows where this stuff goes as a boot-log that would be awesome to know.
This is otherwise a functional installation that I had spent some time setting up already (including a successful compile of Audacious 3.21 that was working with all the plugins).
Is there a way for me to rebuild the graphics system from scratch or should I just give up, cry a little, backup data, wipe partition and reinstall with a USB drive?

User Lekensteyn is probably hitting the nail on the head about me stepping on the MrMEEE/Bumblebee landmine; several months ago (a year? after he'd fixed the rm -r -f /usr bug) I tried installing that mess but it never seemed to do what it was supposed to so I removed it. It's entirely possible that I didn't manage to shovel all of that pile off my system.

<http://paste.ubuntu.com/892799/> --Xorg.0.log

Managed to suppress splash pages a little bit, using steps 1-4 of instructions found here: <http://www.techienote.com/2012/01/disable-gui-boot-in-ubuntu-11-10.html>
Saw a couple errors that make it possible to start diagnosing, 

```
[   14.645074] [drm:intel_dsm_platform-mx_info] *ERROR* MUX INFO call failed
[   14.645266] [drm:intel_dsm_platform-mx_info] *ERROR* MUX INFO call failed

```

Also, when I try to use startx it complains:
 No protocol specified