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

Status in linux package in Ubuntu:

Bug description:
  On Ubuntu 14.04 Beta 2 (Final Beta), it takes remarkebly long to boot up into 
Ubuntu.  Ubuntu gets stuck at "Switched to clocksource tsc" for a almost 1 
minute or longer, then it resumes booting up to the login screen.  On Ubuntu 
13.10 it only takes about 7 seconds to get to the login screen, while it takes 
almost more than a minute to get on the login screen on Ubuntu 14.04 Beta 2. I 
hope this issue could be fixed.
  I have the Acer C720 (chromebook) that has been enabled to use legacy boot so 
I can use other OS's.  Other Acer C720 users have been faceing the same problem 

  Video of Boot

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