Comment # 12 on bug 942876 from Takashi Iwai

(In reply to Ginko Bonsai from comment #9)
> Suspend to RAM didn't change anything.
> 
> > I wonder what the Dell-specific package (for use with Ubuntu 14.04) provides
> that allows this BIOS function to operate correctly?
> 
> I do, too. 
> In the meantime, I got ubuntu-14.04.3-desktop-amd64 installed on a USB key
> attached to the laptop and I installed the Dell Ubuntu packages from here
> http://www.dell.com/support/home/uk/en/ukbsdt1/Drivers/
> DriversDetails?driverId=VW84F&fileId=3458728014&osCode=UB14A&productCode=prec
> ision-m3800-workstation&languageCode=EN&categoryId=CS 
> 
> With those packages installed, I can switch wifi on/off on Ubuntu. Without
> the packages, Ubuntu doesn't react to Fn+PrintScreen either.
> 
> If you give me a hint what I'm looking for, I can try to figure out what's
> different in the Dell packages.

It's really hard to know, as the above contains only binary.  I *guess* some
kernel modification, but can't be confirmed, of course.