Linux 4.1 Power Consumption Appears To Improve For Intel Users

[phoronix]

Phoronix: Linux 4.1 Power Consumption Appears To Improve For Intel Users

A Red Hat developer mentioned to us at Phoronix that they're seeing "drastically improved battery life" in some cases with the Linux 4.1 kernel to the extent that it's up to 2~4 hours of extra battery life with the kernel upgrade to Git. I've since started some fresh Linux laptop battery tests.

http://www.phoronix.com/vr.php?view=21682

[saski]

Are Matthew Garrett's Patches to reduce power drain by using smater SATA ALPM already included in 4.1?

http://mjg59.dreamwidth.org/34868.html

That would explain for the drop in power consumption.

[edoantonioco]

and what about power improvements for amd hardware?

[kokoko3k]

It would be nice to know which cpus (?), chipsets (?) are affected by the change.
Any link to read further?

[curaga]

For the last cases 3.19 had the best numbers...

[Gusar]

Are Matthew Garrett's Patches to reduce power drain by using smater SATA ALPM already included in 4.1?

http://mjg59.dreamwidth.org/34868.html

That would explain for the drop in power consumption.

Nope, not included yet. Once they are, a test using different sata link policies (max_performance, firmware_defaults, medium_power) would be interesting.

[dungeon]

For the last cases 3.19 had the best numbers...

And in xonotic it actually underperform. Iris 5100 should be faster then HD 5500, but here it is not the case... It is something like 40% for what I would expect from that Iris.

[Azrael5]

Excellent news. Is it possible to get a minor consumption on desktop!?

[misp]

What about comparison with Windows?

[kernelOfTruth]

Are Matthew Garrett's Patches to reduce power drain by using smater SATA ALPM already included in 4.1?

http://mjg59.dreamwidth.org/34868.html

That would explain for the drop in power consumption.

working fine here on 3.19.7

if anyone wants to try them out:

https://github.com/kernelOfTruth/linux/commits/linux-3.19.5_LPM_libata

for i in /sys/class/scsi_host/host*; do
         /bin/echo "medium_power" >  $i/link_power_management_policy
done