[mythtv-users] ACPI sleep problems

Stef Coene stef.coene at docum.org
Mon Sep 19 19:55:25 UTC 2005


On Monday 19 September 2005 21:36, Greg Woods wrote:
> On Mon, 2005-09-19 at 20:28 +0100, Steve Hill wrote:
> >   Everything I read says I just need to set the
> > wake-up alarm by echoing a time and date to /proc/acpi/alarm and then
> > suspend the machine by doing:
> >      echo -n mem > /sys/power/state
>
> Where did you read this? I'd like to know because everything *I* have
> read says that ACPI suspend-to-RAM doesn't really work on Linux. I have
> never been able to make it work on my laptop; I can get it to suspend to
> RAM by doing "echo 3 > /proc/acpi/sleep", but there appears to be no way
> to wake it up after that. 
> Suspend-to-disk (so-called "software suspend") 
> supposedly works but I've never been able to make that work either (and
> even if it did, it wouldn't be suitable for this purpose because there's
> no way to do a wakeup other than physically powering it on). ACPI is
> essentially a power management standard that pushes all the power
> management out of the BIOS hardware and into the OS. The more paranoid
> among us think this was a ploy by Microsoft to make it harder to run
> non-Windows OS's on PC laptops. But either way, the ACPI implementation
> in Linux is not very robust as yet. Whether or not it will work will
> likely depend on exactly what kernel version you are running and what
> motherboard and BIOS chip. But it is highly unlikely that it will be as
> simple as echoing something to a /proc or /sys file. If you do manage to
> make it work, I'd love to hear about it.
It works great on my laptop (thinkpad G40).  I use a script so I can fix some 
issues with the display.  Pushing the power button suspends the laptop.  When 
I open the lid, the laptop resumes.  


Stef


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