[kooler]dead battery and APM
Bransford-Koons, Geoffrey R.
GEOFFREY.R.BRANSFORD-KOONS at saic.com
Wed Mar 15 14:58:19 PST 2000
A while ago Lan wondered what really happens when your battery runs out
under Linux and APM. Well, I decided to find out.
So, in case any of you are interested, here are the results:
Laptop: Hitachi 4350X (Pentium 150MMX, 32MB Ram)
OS: RedHat 5.2 with most (but not all) updates installed.
Kernel: 2.0.36 (recompiled from sources to use APM and i586)
APM BIOS: 1.1
Kernel Driver: 1.2
APM version: 2.4
Battery: stock battery that has been in use for about two
I'd estimate about 100 to 150 charges or more.
When apm showed that the battery level down around 5%, about 9
minutes left with a PC card network connection up and running, my
laptop started issuing warning chirps. This happened two or three
times over about 30 seconds and then the laptop went into suspend
I attached the power cord and pressed the unsuspend key combo.
The laptop resumed with no problems.
The apmd entries in /var/log/messages were:
Mar 15 13:41:41 traveller apmd: Battery warning (5% 0:10)
Mar 15 13:42:37 traveller apmd: Charge: * * * (5% 0:06)
Mar 15 13:42:37 traveller apmd: Resume after 00:00:30 (5% 0:06)
One last note: I was not in X at the time although I've suspended
this laptop in X and resumed with no problems.
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