Public bug reported:
The latest version of jaunty generates errors when trying to load the
acpi ac adapter state on boot. The resultant behavior is that the system
is unaware of the ac adapter state (nothing gets populated in
/proc/acpi/ac_adapter or its equivalent sys directory). The error can be
seen via 'dmesg | grep ACPI' after booting:
[ 1.679140] ACPI Error (psargs-0358): [\_PR_.CPU0._PSS] Namespace lookup fail
ure, AE_NOT_FOUND
[ 1.679167] ACPI Error (psparse-0524): Method parse/execution failed [\_SB_.A
C__.ADJP] (Node ffff88013f81a660), AE_NOT_FOUND
[ 1.679215] ACPI Error (psparse-0524): Method parse/execution failed [\_SB_.A
C__._PSR] (Node ffff88013f81a620), AE_NOT_FOUND
[ 1.679264] ACPI Exception (ac-0135): AE_NOT_FOUND, Error reading AC Adapter
state [20080926]
[ 1.769339] ACPI: Battery Slot [BAT0] (battery present)
This is most problematic on the kubuntu distribution, as it relies on
this information to determine the ac adapter state for powerdevil. On
gnome there is some sort of fall back and the correct state is
determined (possibly by interpreting /proc/acpi/battery/*)? After
investigating this further, I recompiled the stock ubuntu kernel from
source with acpi_ac as a module instead of into the kernel and the ac
adapter state is detected correctly. ACPI no longer generates errors and
outputs the following:
[ 1.824127] ACPI: CPU1 (power states: C1[C1] C2[C2] C3[C3])
[ 1.824141] processor ACPI_CPU:01: registered as cooling_device1
[ 1.824143] ACPI: Processor [CPU1] (supports 8 throttling states)
[ 1.858123] ACPI: Thermal Zone [TZ0] (57 C)
[ 12.273114] ACPI: Video Device [PEGP] (multi-head: yes rom: no post: no)
[ 12.302021] ACPI: AC Adapter [AC] (on-line)
Is this the correct method to solve this problem? I've checked this
solution against several other distributions that report the ac adapter
state correctly (namely ArchLinux and openSUSE) and from what I can tell
this is the solution that is used in each case.
lsb_release -rd
--
Description: Ubuntu 9.04
Release: 9.04
uname -a
--
Linux kronos 2.6.28-14-generic #47 SMP Wed Aug 12 07:37:17 EDT 2009 x86_64
GNU/Linux
apt-cache policy linux-image-2.6.28-14-generic
--
linux-image-2.6.28-14-generic:
Installed: 2.6.28-14.47
Candidate: 2.6.28-14.47
Version table:
2.6.28-14.47 0
500 http://us.archive.ubuntu.com jaunty-updates/main Packages
500 http://security.ubuntu.com jaunty-security/main Packages
*** 2.6.28-14.47 0
100 /var/lib/dpkg/status
** Affects: ubuntu
Importance: Undecided
Status: New
--
ac adapter is not detected
https://bugs.launchpad.net/bugs/412499
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