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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