This bug effect me on ubuntu 16.04-4.4.0-36-generic on Asus N55 
The solution adding kernel parameter "tpm_tis.force=1" decreased the 
clocksource from 9s to 4s :
[    3.235387] clocksource: Switched to clocksource tsc
[    7.360005] EXT4-fs (sda3): mounted filesystem with ordered data mode. Opts: 
(null)
but it is stil too long ! 
Startup finished in 7.364s (kernel) + 1.894s (userspace) = 9.259s
* I have SSD (root&home)

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https://bugs.launchpad.net/bugs/1308264

Title:
  Ubuntu 14.04 Beta 2 stuck at "Switched to clocksource tsc" when
  booting up, then resumes booting to the login screen, after 1 minute

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