15. Switching from APM to ACPIDo not let apmd and
acpid run at the same time unless you REALLY know
what you're doing. Debian will not make sure only one is running
at a time. You will have to check.
APM will try to put your system into S3. On the 2.4.x (and before) series
kernels this will quite probably hang your machine. S3 is not supported
until at least 2.5.x. Even the patch won't provide support for S3 in the
2.4.x series kernels. I personally did an apt-get remove apmd
to solve the hanging problem. You should also be aware of another little glitch I discovered. The
XFree86 server has an option for DPMS (Energy Star) features. The DPMS can
states can be one of standby, suspend, off or on. Since the 2.4.x kernels
cannot suspend to disk, this can cause problems. I fixed my system by doing
two things:  | Lost Touchpad and Keyboard Interrupts |
|---|
| | Karl Hegbloom emailed me to say that "keyboard
keys sticking, touchpad pointer jumping suddenly across the screen,
lockups under heavy network I/O [was] caused by
polling the battery state via ACPI and the proc file system." This
problem caused, in part, by a delay between the initial request for
information about the battery's status and the response. In that delay
interrupts may be locked out and synchronization with the keyboard and
touch pad may be lost. "The overnight solution is to either turn off
the battery applet, or reduce its polling frequency." Karl also
notes that a BIOS update was also able to solve the problem. Thanks Karl!
I did not find this to be a problem for me in the 2.4.x kernels,
however, it was a problem when I upgraded to 2.6.5. I use
wmacpi to monitor my battery status. By
setting the polling frequency to 1 (the lowest possible number), I seem
to have eliminated the touchpad lockups. In my
.xinitrc file I use:
/usr/bin/wmacpi -s 1
The -s 1 represents the polling frequency
(sample rate) of "once per minute." The default is 20.
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