Re: [Trisquel-users] Thinkpad T420s 5 beeps

[xliang9550]

The "white list" seems to be a loadable module of the original UEFI firmware.  
Since T420/s doesn't have Boot Guard, you can simply remove the white list  
module and then install ath9k. This should work on every UEFI-based ThinkPad  
without Boot Guard.