ACPI=FORCE

[Charlie Lewis]

On Sunday 24 April 2005 09:04 am, Vincent Trouilliez wrote:
> > okay Vince,
> > when i am putting the option ACPI=FORCE into grub (menu.lst), the
> > MODEPROBE FATAL ERROR is not anymore coming up on startup AND the
> > hotplugging is usually capable of detecting USB devices. without the
> > ACPI=FORCE i get the eror and hotplugging is not working.
> > so, and this i hardly understand, hahaha.
> > regards,
> > René
>
> Thanks René ! USB hotplug never worked for me on Warty, depiste Matt Z.
> told me it does on his machine.  I will try your trick see what it does
> for me !!! :o)
>
>
> --
> Vince, crossing fingers...

I'm not sure which version of the 2.6 kernel series it was changed in, but it 
seems on a couple of the earlier ones, the 

CONFIG_ACPI_BLACKLIST_YEAR:                                             │
  │                                                                         │
  │ enter a 4-digit year, eg. 2001 to disable ACPI by default               │
  │ on platforms with DMI BIOS date before January 1st that year.           │
  │ "acpi=force" can be used to override this mechanism.                    │
  │                                                                         │
  │ Enter 0 to disable this mechanism and allow ACPI to                     │
  │ run by default no matter what the year.  (default)   

was not available and the default was to disable ACPI by default on any 
machine with a bios earlier than 2000 and one had to manually enter the 
acpi=force boot option either in lilo or grub. Ubuntu's Hoary 2.6.10-5-386 
seems to have default config set to allow ACPI to run regardless of the year 
of the bios. I have one machine here that has a GA-7ZX mobo with AMI bios 
dated prior to 2000 and with a couple of distros in order to get full ACPI 
functionality, I would have to use the acpi=force perimeter.

I noticed when I first installed Hoary that I no longer had to tinker with 
that option and then when I went into the kernel for a recompile I found what 
I mention above and the light came on, kind of like "Ah Ha Charlie! Thas what 
has happened." ;-)

But ACPI seems to have a lot of play in usb and hot plugging. I'm not sure I 
understand all the ramifications of it, but Linus over on fa.linux.kernel or 
one of the other guys that hang out there might be willing to take the time 
out to explain it. If one asks nicely. But then they may not. You might get 
told to RTFM, depending on how busy they are on any particular given day. ;-)

I can't explain it. I don't know, and I just haven't got around to Googling 
out all the information nor completely RTFM myself, but I need to. I do know 
that it's been talked about a bunch over there... ;-)

http://shorterlink.com/?SMA4YR

CC