The solution in comment #92 worked for me and, in contrast with comment
#91, for me it was essential to keep the pkill -f wpa_supplicant line.
Using a Samsung NP530U3B laptop with 14.04.
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I had the same problem with 12.04 LTS, x86_64, 3.2.0-27-generic, fully
updated. It affected both Suspend and Hibernate, and Ctrl+Alt+Fs didn't
work, so I had to switch off the machine. Then I realised that I had
installed nvidia-current but not nvidia-current-updates, via the
Additional Drivers
