Greg Kroah-Hartman has released kernel “long haul” 3.0.20, in addition to also announce the availability of the 3.2.5 kernel. In both cases the news is on the including a patch that fixes the problem with the detection and enabling or disabling the feature ASPM in different outfits.
As mentioned earlier in MuyLinux, the problem with the management of this energy saving feature generated a significant reduction in battery life on laptops , a conflict that have dedicated Phoronix much attention and some analysts said they did not really exist.
seems that the problem was real, I could never prove it, and our readers have not said much about it, but evidence was presented in other media, and the new kernel is stated that energy consumption on a ThinkPad yes X220 had that problem has been reduced by 5 watts, a respectable amount , something that was already talking about a few days ago Rodrigo Russo.
That could end a conflict that took months to be resolved directly in the kernel, but on the other hand, as discussed in The H Open, there is another more significant problem, which affects the characteristics of energy saving integrated graphics chip on Intel Sandy Bridge Series , as the current Linux kernel does not activate the feature called RC6 that just takes advantage of that savings. However can be enabled in the boot parameters of the distro with the flag
i915.i915_enable_rc6 = 1 .