Bug#677016: resume failure: kobject_add_internal failed for BAT0 with -EEXIST

[Jonathan Nieder <jrnieder@gmail.com>]

Eugen Dedu wrote:

> # echo reboot > /sys/power/disk
> # echo disk > /sys/power/state
> [screen got black for ~2 secs, it shows "Cannot find swap device,
> try swapon -a.\nCannot get swap writer" - which is normal since I do
> not have one - and afterwards comes back]
> bash: echo: write error: No such device

Yeah, suspend-to-disk requires swap.

[...]
> This works too:
> # echo none >/sys/power/pm_test ; for i in `seq 10`; do echo mem > /sys/power/state; sleep 2; s2ram; sleep 2; done

Hm.  What tool do you normally use to suspend to RAM?