I managed to install and run the mainline kernel (3.17). With it the
battery discharge rate is dramatically down, about half of what it is
with kernel 3.13 (~ 15W), but still above what it was with Ubuntu 12.04.
Also, with kernel 3.17 it seems the automatic screen dimming is not
working.
Cheers.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1347539
Title:
Abnormally high battery discharge rate on Lenovo T420
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