Comment 32 for bug 829980

James Hunt (jamesodhunt) wrote :

Thanks to all those who attached logs. All logs show trailing binary 0x02 (CONTROL-B) bytes at the end of the POWER_SUPPLY_MANUFACTURER value. So I think this single rogue byte, encoded in the battery meta-data, is ironically indirectly causing you high battery drain :-(

The fact that we've so far only seen this problem with power supply manufacturer strings suggests that it is *highly* unlikely there will be any adverse effects of the proposed fix since even if an Upstart job were to care about a battery device, it really shouldn't be caring about the specific manufacturer details.

Please could those affected by this issue test the fix available in the following PPA:

  https://launchpad.net/~jamesodhunt/+archive/bug-829980

To install the fix:

1) In a terminal, run:

   sudo add-apt-repository ppa:jamesodhunt/bug-829980

  This will show you some text and ask you to press return to enable this repository.

2) Run:

  sudo apt-get update && sudo apt-get upgrade

Step (2) should pull in the latest test version of Upstart (version "1.3-0ubuntu12~bug829980"). If so, reboot as normal and then update this bug with your results.

[Note: I've tested this fix, but note that I do not have access to any of these bad batteries. So, in the unlikely event you *do* experience issues with the fix, remove your battery and boot from AC power].

Thanks in advance.