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  From: Craig Markwardt <craigm@pcasun3.gsfc.nasa.gov>
  To  : <apmd-list@worldvisions.ca>
  Date: Fri, 18 Jun 1999 15:04:18 -0400 (EDT)

Re: apm daemon, suspend/resume

[ Discussion with PCMCIA maintainer David Hinds forwarded with permission. ]

David Hinds writes:
 > On Fri, Jun 18, 1999 at 12:01:10PM -0400, Craig Markwardt wrote:
 > > 
 > > Are you saying that "cardctl suspend" and an APM suspend event handled
 > > by the PCMCIA core modules will result in the same thing?
 > 
 > That is correct.  "cardctl suspend" sends a suspend event to all the
 > PCMCIA client event handlers, and should be indistinguishable from an
 > APM suspend event.
 > 
 > > I don't
 > > think that's what people have been experiencing.  Personally, I don't
 > > have problems, but every once in awhile I've seen messages from people
 > > who have to be sure to "suspend" (or maybe "eject"?) their card before
 > > going into suspend mode.
 > 
 > That would be an important difference.  "eject" will completely shut
 > down a driver.  There are some drivers that can't currently handle
 > suspend/resume events: the SCSI drivers, CardBus drivers, and maybe
 > some others.  Doing a "cardctl eject" before a suspend will work
 > around some of these problems.
 > 
 > > The question is whether "cardctl suspend" should be called by apmd by
 > > default.
 > 
 > I'd like to hear from anyone who thinks that this actually makes a
 > difference.
 > 
 > > P.S.  May I forward this correspondence to the apmd mailing list?
 > 
 > Sure.
 > 
 > -- Dave
 >