On my Thinkpad x220 when I am running on battery under Ubuntu 11.10 and I do a normal shutdown, the system shuts down correctly, but it reboots after 1 sec. This only happens when i am on battery. I found that it is related to the module e1000e, for example when i do sudo rmmod […]
To get the same battery life running a Linux installation and Windows is still a challenge. Especially for ThinkPads as Lenovo Engineers seems to magically tweak the drivers to use less power. For Linux, power usage has never been excellent out of the box and some tuning and extra knowledge is necessary to double the out-of-the-box battery life. I get more than 12 hours for Ubuntu 11.10 with the 9-cell battery, the power usage in Idle State is around 7.5W.