Public bug reported:
Binary package hint: acpi-support
When operating a laptop on AC but within a moving vehicle, disk idleing
("laptop-mode") is needed even on AC. Not nessecarily to lett the disk spin
down, but to leave the heads parked long enoght periods of time for shock
protection.
(https://wiki.ubuntu.com/PowerManagement)
However, configuring /etc/laptop-mode/laptop-mode.conf appropriately
gets overridden
1) /etc/acpi/power.sh calls laptop_mode with start/stop.
2) Setting less aggressive settings than hdparm -B1 (fastest headparking
and spin down) on battery get overridden because power.sh will set
hdparm -B1 _after_ calling laptop_mode start. (That even overrides any
longer $HDPARM -S $SPINDOWN_TIME in the line before that one.)
"/sbin/laptop_mode auto" will check configured conditions itself. Laptop-mode
won't be activated unless ENABLE_LAPTOP_MODE=true is also set in
/etc/default/acpi-support, though. (/etc/init./laptop-mode checks that and
therefore two places exist in ubuntu where disk-idleing (aka laptop-mode) needs
to be anabled. The other is in laptop-mode.conf)
Flexible approach:
Package acpi-support:
Remove laptop_mode start/stop calls and hdparm stuff from power.sh
Remove ENABLE_LAPTOP_MODE setting from /etc/default/acpi-support. (And point to
laptop-mode.conf for LM on battery, empty battery and AC.)
Package laptop-mode-tools:
Include scripts that call "/usr/bin/laptop_mode auto" in in /etc/acpi/ac.d,
battery.d, resume.d and start.d. Then its the users choice to put scripts after
or before the laptop-mode symlinks.
(Adapt the approach from the original laptop-mode-tools debian package to
current ubuntu acpi-support)
(The current laptop-mode disk-idleing approach seems to be a left-over from
before the ubuntu-laptop-mode package was droped for laptop-mode-tools.)
** Affects: acpi-support (Ubuntu)
Importance: Undecided
Status: New
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/etc/acpi/power.sh overrides user settings
https://bugs.launchpad.net/bugs/244836
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