Re: apm vs. acpi

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I get a message at the time boot from ACPI, which says some thing like
ACPI cut-off age=CCYY (~1997) try using ACPI=force

I tried giving the kernel parameter ACPI=force, but his still pop's up ?


                      Ed Hill                                                                                                            
                      <[email protected]>               To:       For users of Fedora Core releases <[email protected]>                    
                      Sent by:                   cc:                                                                                     
                      fedora-list-bounces        Subject:  Re: apm vs. acpi                                                              
                      12/29/2004 01:15 PM                                                                                                
                      Please respond to                                                                                                  
                      ed; Please respond                                                                                                 
                      to For users of                                                                                                    
                      Fedora Core                                                                                                        

On Wed, 2004-12-29 at 08:48 -1000, Amy M wrote:
> All things considered, this fedora-list has become perhaps one of the
> best forums to learn Linux.  Our sincere thanks to those who are
> gracious enough to donate their time answering questions that sometimes
> may seem ridiculous.
> My question now is: From what I have read, it appears that if I want to
> do suspend to ram, I have to forgo acpi and use apm.  Performance-wise,
> would anyone care to comment on the pros and cons of acpi vis-a-vis
> apm?  Thanks again.

Hi Amy,

I can only relate my FC kernel-2.6 experiences for one laptop, a
ThinkPad A22p (PIII-900) and they are:

 - with very recent kernels (eg. 2.6.9-1.681_FC3) both APM
   and ACPI suspend-to-RAM work
 - with both I often need to unload and then re-load the
   sound kernel modules
 - APM:
   - uses *very* little power when suspended to RAM (lasts
     for many days starting from a full charge)
   - can occasionally have problems with pcmcia (even when
     all cards are removed) so I usually use:
       "/etc/init.d/pcmcia stop ; apm -s"
     and then restart pcmcia after wake-up with:
       "/etc/init.d/pcmcia start"
   - results in lockups about once every 40--50 suspend-
     resume cycles
 - ACPI:
   - has no apparent problems with pcmcia
   - experienced no lockups (in about ~60 cycles)
   - uses a *LOT* (perhaps as much as 10X) more battery
     power while suspended to RAM
   - suspends and resumes very quickly
   - routinely gives a kernel error on wakeup saying
     something about interruptable_sleep() but they seem
     to be harmless

Having done many hundreds of suspend-resume cycles using both APM and
ACPI, I've decided to stick with APM to reduce the battery usage.


Edward H. Hill III, PhD
office:  MIT Dept. of EAPS;  Rm 54-1424;  77 Massachusetts Ave.
             Cambridge, MA 02139-4307
emails:  [email protected]                [email protected]
phone:   617-253-0098
fax:     617-253-4464

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