Comment 3 for bug 20390

$ sudo env XRESPROBE_DEBUG=yes xresprobe nv
laptop: ; ddc: yes
attempting DDC detection
id:
res:
freq:
disptype:
id:
res:
freq:
disptype:
not cleaning up after Xorg; not forked

$ sudo env DEBUG_XRESPROBE=yes sudo xresprobe nv
id:
res:
freq:
disptype:

There is no file in /tmp that looks particularly interesting:

$ ls -la /tmp/
total 5
drwxrwxrwt 9 root root 240 2005-08-25 17:33 .
drwxr-xr-x 22 root root 1024 2005-08-25 17:26 ..
drwxrwxrwt 2 ubuntu ubuntu 60 2005-08-25 17:29 .esd-1000
drwx------ 3 ubuntu ubuntu 60 2005-08-25 17:29 gconfd-ubuntu
srw-rw-rw- 1 root root 0 2005-08-25 17:28 .gdm_socket
drwxrwxrwt 2 root root 60 2005-08-25 17:29 .ICE-unix
drwx------ 2 ubuntu ubuntu 60 2005-08-25 17:29 keyring-MCmam5
srwxr-xr-x 1 ubuntu ubuntu 0 2005-08-25 17:30 mapping-ubuntu
drwx------ 2 ubuntu ubuntu 440 2005-08-25 17:32 orbit-ubuntu
drwx------ 2 ubuntu ubuntu 60 2005-08-25 17:28 ssh-lJosX20647
-r--r--r-- 1 root root 11 2005-08-25 17:28 .X0-lock
drwxrwxrwt 2 root root 60 2005-08-25 17:28 .X11-unix

Maybe this gives a hint:

$ sudo ddcprobe
VESA BIOS Extensions not detected.

This happens on my installed system, too, so it's not a particular live-cd bug;
I adapt the bug metadata accordingly.