On 12/18/2015 05:19 PM, Nathan Moore wrote:
> ...
> In the time since (after turning freq scaling back on, and 
> occasionally before), I've seen the "Fast TSC calibration failed" 
> error during boot.  This error locks up the machine and it doesn't 
> make it to the login screen.
>
> Most of the google results from this error call it harmless.  Does it 
> sound like this error relates to my hardware (rather than SL7?)
>
My Dell Precision M6500 throws the Fast TSC Calibration error every 
three or four boots; it doesn't lock it up (in fact, it threw the error 
when I booted it today, and it's still running several hours later).  
Are you booting up with full kernel logging enabled rather than being in 
quiet mode.