howto set kernel command line on live-usb?

[poma]

On 08.05.2015 16:02, poma wrote:
> On 08.05.2015 14:15, Neal Becker wrote:
>> On starting live-usb, it says 'hit tab for options' or something like that.  
>> I hit TAB, then I see the command line.  I add my option drm.debug=14 to the 
>> end.  Now what?  If I hit RET, it proceeds to boot.
>>
>> But looking at journalctl, it doesn't appear that my added command line 
>> option was used!
>>
>>
> 
> $ cat /proc/cmdline
> 
> $ dmesg | grep -i Command\ line
> 
> 

$ grep command\ line /var/log/Xorg.0.log