Red Hat Bugzilla – Bug 1470543
Performance drop on laptop with two batteries
Last modified: 2017-10-13 09:45:40 EDT
Description of problem:
Using ThinkPad T470 which has two batteries the performance drops heavily when one of the batteries reaches 5% charge.
Version-Release number of selected component (if applicable):
Every time, but on specific hardware (laptop with two batteries)
Steps to Reproduce:
1. Drain battery till it reaches 5%
2. Performance drop will be noticeable doing any usual tasks
Performance is heavily reduced, desktop environment is lagging, etc.
Everything still works as smooth as before since the second battery is still charged.
I am not sure if this is really related to gnome-power-manager. It might be some other power handling service.
When performance is reduced it is possible to recover from this state by plugging in an ac power adapter. Then everything instantly works again as it should.
This looks like the CPU throttling issue with 3 cell external SMP batteries that has been addressed in BIOS v1.42: https://pcsupport.lenovo.com/nl/en/products/LAPTOPS-AND-NETBOOKS/THINKPAD-T-SERIES-LAPTOPS/THINKPAD-T470/downloads/DS120430
(In reply to George Sapkin from comment #2)
> This looks like the CPU throttling issue with 3 cell external SMP batteries
> that has been addressed in BIOS v1.42:
Yes, from the first look it seems to be fixed by updating BIOS.