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#1 2012-11-11 16:30:26

dura
Bloated Gimp
From: interzone
Registered: 2012-09-15
Posts: 2,108

Power Savings on HP Elitebook 2560p

Moved from thread: 'Battery Life on Thinkpad x220'

I've just installed waldorf on a HP Elitebook 2560p.

Power is around 17.5w.

Using these parameters from el_koraco, and phoronix, etc.,

el_koraco wrote:

You have two choices. First, you can run the Liquorix kernel. Second, you can run the Debian kernel, but you have to edit /etc/default/grub and change GRUB_CMDLINE_LINUX_DEFAULT="quiet" to

GRUB_CMDLINE_LINUX_DEFAULT="quiet pcie_aspm=force i915.i915_enable_rc6=1  i915.i915.lvds_downclock=1 i915.i915_enable_fbc=1"

Then you run sudo update-grub and reboot.

Last edited by dura (2012-11-12 00:35:31)

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#2 2012-11-11 16:31:29

dura
Bloated Gimp
From: interzone
Registered: 2012-09-15
Posts: 2,108

Re: Power Savings on HP Elitebook 2560p

I just added the parameter, and watts went from 17.8 to 11- 12w.

I will now try with semaphores as well, because it was that which seemed to make the big difference to my x121e.

These, instead:

GRUB_CMDLINE_LINUX_DEFAULT="pcie_aspm=force i915.i915_enable_rc6=1 i915.i915_enable_fbc=1 i915.lvds_downclock=1 i915.semaphores=1"

These parameters seem to make little difference, Elitebook is still around 11-12w.

Now hardran's script.

Last edited by dura (2012-11-12 00:36:47)

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#3 2012-11-11 16:32:48

dura
Bloated Gimp
From: interzone
Registered: 2012-09-15
Posts: 2,108

Re: Power Savings on HP Elitebook 2560p

After hardran's script, power is now down to 9.69w.

Might have a look at tlp next.

For some reason powertop wont let me see baseline power, only actually consumption.

Last edited by dura (2012-11-11 16:37:43)

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#4 2012-11-11 17:41:29

dura
Bloated Gimp
From: interzone
Registered: 2012-09-15
Posts: 2,108

Re: Power Savings on HP Elitebook 2560p

TLP is now on. More savings noticed.

Now applying powertop sticky settings and it is going down more:

8.2w and counting....

Going to continue fiddling, going by this guide:

https://lesswatts.org/

The devil at work: baseline apparently 666mw, idles around 7-8w, and go all the way up to 25w briefly under load.

Last edited by dura (2012-11-12 00:33:28)

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