apcaccess fails with connection timed out

[John Plaxco]

Binary package hint: apcupsd

I use apcupsd to monitor the status of the attached UPS on my machine. It uses a standard USB cable. Before upgrading to Lucid Lynx, everything worked fine. Now, when using apcaccess to poll the state of the AC supply, around 10% of the time I will receive the message:

Error reading status from apcupsd @ localhost:3551: Connection timed out

Running the command again connects without issue, and the PID isn't changing. stracing the daemon shows it's not mysteriously quitting and respawning, it's still running when the connection is timing out.

lsb_release -a:
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 10.04 LTS
Release: 10.04
Codename: lucid

apt-cache policy apcupsd:
  Installed: 3.14.6-3ubuntu1
  Candidate: 3.14.6-3ubuntu1
  Version table:
 *** 3.14.6-3ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ lucid/universe Packages
        100 /var/lib/dpkg/status

lsusb:
Bus 003 Device 002: ID 051d:0002 American Power Conversion Uninterruptible Power Supply

Steps to reproduce:
for i in seq 1 100; do
apcaccess >/dev/null
done

Expected result:
Command should always return current UPS status while apcupsd is running.

Actual result:
10% of the time, a time-out message is returned instead of the expected status message.

Attaching apcupsd.conf. Any other information available upon request.

Thanks!

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: apcupsd 3.14.6-3ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-21.32-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-21-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Tue May 4 18:42:57 2010
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: apcupsd

[John Plaxco (c-launchpad-ignisobscurae-com)]

I compiled apcupsd 3.14.8 from apcupsd.com and it seems to have decreased the frequency of the error to less than 1% of the time, but it still occurs sometimes.

[Alex (a-t-page)]

Apcaccess works great for me for a couple of days, after which it will only respond about 5% of the time (Connection timed out). A few days after a restart, my /var/log/messages starts filling with "generic-usb 0003:051D:0002.0001: control queue full", and I'm not sure what's triggering the problem (051d:0002 is the UPS).

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.