I am having similar issue. I am running Fedora 15 (with all updates) o a Sony VAIO VPCZ1290X (Z Series) with 8 GB of RAM and 512 GB of SSD. Most things work well (I haven't tried the camera), but:
- Battery is only charged to 50%. This may be a "battery saving" feature, but how do I change the limit?
- With a large capacity battery charged to 50%, with light web browsing via WiFi, I can only get no more than one hour of use. On the same laptop under Windows 7 Home Premium, it can run more than 4 hours.
- I cannot find documentation on the latest (version 1.98) PowerTOP utility to understand its display.
Can someone help me? Thanks.
---------- Post added at 09:55 PM ---------- Previous post was at 01:49 PM ----------
I should have read all articles on http://www.lesswatts.org/
. Even though they (and the screenshots) refer to a much older version of PowerTOP, they are useful nonetheless, and I should not have dismissed them out of hand in the first place.
In the "Tunables" tab, I simply pressed <ENTER> on each entry that was "Bad" and changed it to "Good". After a short while, my power consumption (as measured crudely by how loudly my laptop fan sounds) dropped. Mos noticeably, wakeups/second (in the Overview tab) dropped from > 3,000 to around 700, and now my CPUs spend more of the time in high-numbered C-states.