APM sleep vs. ACPI S3 sleep
Hi
APM sleep eg. when running linux 2.4 with the APM behaviour in the BIOS used to suspend the machine, the battery would last for a long time and the machine would be cold to the touch (ie it's at the ambient temperature).
ACPI S3 sleep looks the same but the battery does not last long and the machine is warm to the touch.
Has anyone else seen this behaviour? Is it possible that the machine is waking itself periodically or at a certain level of discharge? Is it possible to make the ACPI sleep deeper?
-Cam
Signature · 7 lines
camilo-Nk/[email protected] <-- ------------------------------------------------------- This SF.Net email is sponsored by: Oracle 10g Get certified on the hottest thing ever to hit the market... Oracle 10g. Take an Oracle 10g class now, and we'll give you the exam FREE. http://ads.osdn.com/?ad_id=3149&alloc_id=8166&op=click
A message that is not in the archive (sent off-list or not yet received): 40ACE6B4.4060408-Nk/[email protected]
Quoted 6 lines · Cam
Hi
APM sleep eg. when running linux 2.4 with the APM behaviour in the BIOS used to suspend the machine, the battery would last for a long time and the machine would be cold to the touch (ie it's at the ambient temperature).
Quoted 6 lines
ACPI S3 sleep looks the same but the battery does not last long and the machine is warm to the touch.
Has anyone else seen this behaviour? Is it possible that the machine is waking itself periodically or at a certain level of discharge? Is it possible to make the ACPI sleep deeper?
S3 is suspend to RAM, so the processor will be off, but RAM will still be refreshed; and some devices may still consume power.
S4 is suspend to disk, and it should be as cold this way as S5.
-Len
-------------------------------------------------------
This SF.Net email is sponsored by: Oracle 10g
Get certified on the hottest thing ever to hit the market... Oracle 10g. Take an Oracle 10g class now, and we'll give you the exam FREE.
http://ads.osdn.com/?ad_id=3149&alloc_id=8166&op=click
A message that is not in the archive (sent off-list or not yet received): [email protected]
Len
Quoted 4 lines
S3 is suspend to RAM, so the processor will be off, but RAM will still be refreshed; and some devices may still consume power.
S4 is suspend to disk, and it should be as cold this way as S5.
The machine is now running with more memory than the BIOS was claimed to support, maybe this warmth in suspend is a side effect? Some misconfiguration of the memory? Increasing the memory and moving to ACPI/2.6 happened about the same time.
I don't think the machine supports S4 but I will be trying the linux software suspend stuff soon.
-Cam
Signature · 8 lines
camilo-Nk/[email protected] <-- ------------------------------------------------------- This SF.Net email is sponsored by: GNOME Foundation Hackers Unite! GUADEC: The world's #1 Open Source Desktop Event. GNOME Users and Developers European Conference, 28-30th June in Norway http://2004/guadec.org
Hi!
Quoted 11 lines
APM sleep eg. when running linux 2.4 with the APM behaviour in the BIOS used to suspend the machine, the battery would last for a long time and the machine would be cold to the touch (ie it's at the ambient temperature).
ACPI S3 sleep looks the same but the battery does not last long and the machine is warm to the touch.
Has anyone else seen this behaviour? Is it possible that the machine is waking itself periodically or at a certain level of discharge? Is it possible to make the ACPI sleep deeper?
Probably some driver forgot to place its hardware to proper sleep. Try to find out exactly what produces heat.
Signature · 9 lines
64 bytes from 195.113.31.123: icmp_seq=28 ttl=51 time=448769.1 ms ------------------------------------------------------- This SF.Net email is sponsored by: Oracle 10g Get certified on the hottest thing ever to hit the market... Oracle 10g. Take an Oracle 10g class now, and we'll give you the exam FREE. http://ads.osdn.com/?ad_id=3149&alloc_id=8166&op=click