I found the workaround. Critical battery trigger has two modes:
'nothing' will ignore a seemingly critically low battery signal
'suspend' is the default which causes the computer to suspend upon receiving
this erroneous signal
Check the current mode:
$ gsettings get
Has anyone found a workaround to disable this warning and its associated
action in dconf?
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https://bugs.launchpad.net/bugs/487867
Title:
No preference to enable/disable low battery
It seems that the warning sound was removed in Ubuntu 10.04 LTS. There
is no option in Power Management Preferences to turn this feature
on/off.
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No preference to enable/disable low battery alarm
https://bugs.launchpad.net/bugs/487867
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Ya..it is very urgent...
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No preference to enable/disable low battery alarm
https://bugs.launchpad.net/bugs/487867
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Bugs, which is subscribed to Ubuntu.
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Thank you for confirming this bug.
** Changed in: gnome-power-manager (Ubuntu)
Status: New = Confirmed
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No preference to enable/disable low battery alarm
https://bugs.launchpad.net/bugs/487867
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Bugs, which is
** Attachment added: Dependencies.txt
http://launchpadlibrarian.net/36039118/Dependencies.txt
** Attachment added: DevkitPower.txt
http://launchpadlibrarian.net/36039123/DevkitPower.txt
** Attachment added: GConfNonDefault.txt
http://launchpadlibrarian.net/36039133/GConfNonDefault.txt