Tracking it through more files than I can recall, I found that /usr/lib
/pm-utils/power.d/95hdparm-apm calls /lib/hdparm/hdparm-functions which
includes the following lines:
if hdparm_is_on_battery; then
hdparm_set_option -B127
Changing -B127 to -B254 seems to prevent APM causing ATA resets on battery
mode. This method allows the other hdparm values to be set properly.
I'm not sure of the wider implications of this or what has changed since Ubuntu
11.x (did it also set -B 127? did something else change which has meant -B 127
causes ATA resets on my hardware?).
If anyone can help get my findings to the correct person/group/project
to resolve this permenantly I'd be most grateful.
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/984308
Title:
ATA failures when operating on battery power in Ubuntu 12.04
To manage notifications about this bug go to:
https://bugs.launchpad.net/linux/+bug/984308/+subscriptions
--
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
