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Low battery -> power down + clock set back to 1904-01-01

The battery of my PowerBook G4 got too low and the machine was put into
sleep. I closed the lid, changed the battery, but when I reopened the
lid, I noticed that the PowerBook was in fact off. And when I switched
it on (around 21:00), the clock was set back to 1904-01-01. Here's a
/var/log/syslog excerpt:

Jan 22 20:45:36 ay kernel: eth0: switching to forced 10bt
Jan 22 20:45:57 ay kernel: eth0: switching to forced 100bt
Jan 22 20:46:04 ay kernel: eth0: switching to forced 10bt
Jan 22 20:46:24 ay kernel: eth0: switching to forced 100bt
Jan 22 20:46:29 ay pmud[762]: running /etc/power/pwrctl warning battery
Jan 22 20:46:32 ay kernel: eth0: switching to forced 10bt
Jan 22 20:46:39 ay pmud[762]: battery critically low: request system sleep 
Jan 22 20:46:39 ay pmud[762]: running /etc/power/pwrctl sleep battery
Jan 22 20:46:40 ay pmud[762]: going to sleep
Jan  1 00:15:17 ay syslogd 1.4.1#10: restart (remote reception).
Jan  1 00:15:17 ay kernel: klogd 1.4.1#10, log source = /proc/kmsg started.
Jan  1 00:15:17 ay kernel: Inspecting /boot/System.map-2.4.22-powerpc
Jan  1 00:15:18 ay kernel: Loaded 22275 symbols from /boot/System.map-2.4.22-powerpc.
Jan  1 00:15:18 ay kernel: Symbols match kernel version 2.4.22.
Jan  1 00:15:18 ay kernel: Loaded 104 symbols from 4 modules.
Jan  1 00:15:18 ay kernel: Memory BAT mapping: BAT2=256Mb, BAT3=0Mb, residual: 0Mb
Jan  1 00:15:18 ay kernel: Total memory = 256MB; using 512kB for hash table (at c0380000)
Jan  1 00:15:18 ay kernel: Linux version 2.4.22-powerpc (root@pegasos2) (gcc version 3.3.3 20040110 (prerelease) (Debian)) #1 Wed Jan 14 17:02:37 CET 2004

Where does the problem come from? I've never had one like that before.
As the kernel is quite new, I suspect that it is the cause.

-- 
Vincent Lefèvre <vincent@vinc17.org> - Web: <http://www.vinc17.org/> - 100%
validated (X)HTML - Acorn Risc PC, Yellow Pig 17, Championnat International
des Jeux Mathématiques et Logiques, TETRHEX, etc.
Work: CR INRIA - computer arithmetic / SPACES project at LORIA
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