[ltp] Excessive power consumption: x220 with Fedora 15

[Henrique de Moraes Holschuh]

On Sat, 27 Aug 2011, P. Siegl wrote:
> I don't want to fight with you. :-) I only wanted to show you more
> options for a low power consumption on Thinkpad x220.

...

That commit:
> > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c1a9f047638b27e481d097910604316b8a0d132b

has a pointer to the bug report:
https://bugs.freedesktop.org/show_bug.cgi?id=31742

Where it makes clear that FBC *for certain workloads* can actually demand
more power.  It does not make it clear whether that happens only on certain
chipsets or not.

Looks like there are synthetic workload testsuites that can be run to check
the power draw, maybe someone could run them on the x220?  Run it while on
battery, and the thinkpad can tell you the power draw.

The testsuits mentioned in the bugzilla report above are from the Battery
Life Tool Kit (bltk).

The bugzilla report also mentions a fbc-related fix that landed in
3.1-rc1.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh