Ticket #9251 (closed defect: fixed)

Opened 6 years ago

Last modified 5 years ago

EC fails to clear full flag in certain low voltage cases

Reported by: rsmith Owned by: rsmith
Priority: normal Milestone: Not Triaged
Component: embedded controller Version: not specified
Keywords: Cc:
Action Needed: test in build Verified: no
Deployments affected: Blocked By:


When a battery (any battery) has a voltage low enough to activate the trickle charger (< 5.35V) there are cases where the EC will fail to clear the full flag and thus the charging stops once the trickle phase is over.

There is not enough energy in the battery to power the XO form more than a few minutes after you disconnect external power. Thus the EC never has a chance to detect that the battery is really empty.

The result is that the battery is stuck in a cycle where the EC will never charge it beyond the trickle phase.

This is fixed in firmware q2e32

Change History

Changed 5 years ago by rsmith

  • status changed from new to closed
  • resolution set to fixed
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