Some udates: today, after update to ubuntu9 version of hal packages, gnome-power-preferences has stated to show battery tab again and the battery icon appears in the panel. Then I restarted and everything is as before (not working).
More over, since yesterday afternoon, without any apparent reasone, also legacy backend is not able to get information from battery other than charging state, this is output: [EMAIL PROTECTED]:~$ cat /proc/acpi/battery/BAT0/state present: yes capacity state: ok charging state: charging present rate: 0 mW remaining capacity: 0 mWh present voltage: 0 mV -- ubuntu doesn't notice when running on battery https://launchpad.net/bugs/39413 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs