[ltp] Excessive power consumption: x220 with Fedora 15

[Lars Seipel]

On Thursday, August 11, 2011 11:33:46 AM Christos Papadopoulos wrote:
> Powertop reports 16-17W with machine idle. Unit is X220-4286, Intel
> graphics and network. Is this normal? Any ideas how to reduce it?

Some option for the i915 kernel module got disabled by default because it 
caused serious regressions for some people. See this upstream kernel commit

http://git.kernel.org/?p=linux/kernel/git/stable/linux-3.0.y.git;a=commitdiff;h=05bd42688dbc066d4e2689b6f73c0470601f788b

Unfortunately this led to an increased power consumption on other devices. 
Luckily, it can be trivially turned on again. See

https://bugzilla.redhat.com/show_bug.cgi?id=727579

Solution works for me on X220...

Lars