I'm using Conky 1.8.0 on Ubuntu 10.4. After the upgrade the battery_bar was broken. In my conkyrc there was
${battery_bar 8,150}
leading to a broken bar and this:
Conky: can't open /sys/class/power_supply/8,150/uevent: No such file or directory
Conky: can't open /proc/acpi/battery/8,150/state: No such file or directory
It seems that conky uses the arguments in a wrong way. A workaround is to use default_bar_size (btw: why is it width height there and not height width?) instead.
Reported in launchpad as:
https://bugs.launchpad.net/ubuntu/+source/conky/+bug/569195
Fixed by commit 8564ff6610cf5ed060e6dd206ad9878e96d98130