Red Hat Bugzilla – Bug 1011213
apcupsd fails to start when using USB serial port device
Last modified: 2013-09-24 11:39:24 EDT
Description of problem:
When an USB serial device is used, apcupsd fails to start at system boot even though it is enabled.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. install a USB serial device
2. configure apcupsd to use the USB serial device, (DEVICE /dev/ttyUSB0)
3. reboot the system
apcupsd does not start because it cannot connect to the serial device.
apcupsd should start
Using systemctl start apcupsd.service after the system has booted starts apcupsd successfully.
Do you have ModemManager installed?
If you do, try to remove it, reboot and check if apcupsd works or not.
If you need ModemManager, install it back. If you are connected via modem, download ModemManager rpm first (using yumdownloader) so you don't need internet connection to install it back.
Also what is the apcupsd error message exactly?
Yes, I had ModemManager installed. No, did not need it. Removed it and apcupsd started correctly.
Unfortunately, ModemManager steals all (usb)serial devices during boot.
*** This bug has been marked as a duplicate of bug 544121 ***