Comment 24 for bug 653714

.... further info ....

# xrandr --verbose --q12
No protocol specified
Can't open display :0
# xrandr --prop --q12
No protocol specified
Can't open display :0

The only anomaly in Xorg.0.log I can detect is:
[ 26.386] (II) NOUVEAU(0): Unknown vendor-specific block f
[ 26.386] (II) NOUVEAU(0): U0674^B<9A>M1LW02
[ 26.386] (II) NOUVEAU(0): <C0><B0><A0><90><80>hH
[ 26.386] (II) NOUVEAU(0): EDID (in hex):
[ 26.386] (II) NOUVEAU(0): 00ffffffffffff004d109f1300000000
[ 26.386] (II) NOUVEAU(0): 200d0103802115780aa8a098554d8f26
[ 26.386] (II) NOUVEAU(0): 1f505400000001010101010101010101
[ 26.386] (II) NOUVEAU(0): 0101010101012f3f800871b023406420
[ 26.386] (II) NOUVEAU(0): 26004bcf100000190000000f00000000
[ 26.386] (II) NOUVEAU(0): 00000000002892025000000000fe0055
[ 26.386] (II) NOUVEAU(0): 30363734029a4d314c573032000000fe
[ 26.386] (II) NOUVEAU(0): 00c0b0a0908068480002010a202000a4

# dmesg|egrep -C 2 'nouveau E'
[ 7.842891] nouveau [ DRM] DCB outp 00: 01000100 000088b8
[ 7.842900] nouveau [ DRM] DCB outp 01: 02110223 00000064
[ 7.842907] nouveau E[ DRM] Unknown LVDS configuration bits, please report
[ 7.842985] nouveau [ DRM] DCB outp 02: 01120312 00000040
[ 7.842994] nouveau [ DRM] DCB outp 03: 01130321 00000001

... I'll be happy to report more info if required (in a detailed way please)