Windows is pushing a new BIOS upgrade (1.2.4) for battery charging control on LIFEBOOK A544.
With this new update, the system uses constantly 80% of one (out of four) CPU. This happens on Windows (with System process) and on linux (with kworker).
This high CPU usage problem got solved with 1.2.0 update, but it was brought back by every next update up to 1.2.5, which is the last one available.
I had to downgrade to version 1.2.0 (fixing the CPU load bug again), but I would like to have the battery bug fixed, and at the same time having a normal CPU usage.
I don't know how to officially file a formal bug report, so please do it for me, or tell me how to do it.
If somebody needs to downgrade, he/she should disable the "build date time checking" by running in DOS the following command: dosflash /bbl /cvar /silent /sd /file BIOS.Cap