How I get 7 hrs+ with my Yoga Pro 2

1) Undervolt (see previous post) this can help a lot depending on your chip. I was able to undervolt the cache, core, and GPU for a total savinings of .16V across all VID steps.
2) No fan using notebookfan control untils 58C makes my medium usage basically never kick on ever saving battery and noise ( Yoga 13 Fan Noise - Page 84 - Lenovo Community)
3)Brightness 70%
4)Balanced profile (everything set to maximum power savings and maximum CPU to 80%)
5)Use internet explorer (it is MUCH more battery friendly especially when viewing flash videos)

I have this with the high performance colors and at 3200x1800. Medium usage to me is web browsing/one note usage/IM+ with some flash content.

 

A couple clarifying questions
1. what specifically did you set your undervolts to? I have dynamic cpu voltage offset, processor cache voltage offset and processor graphics voltage offset. These all have very small steps, in mV - so I read your comment as having adjusted each of these by 160mV - but that seems to break my system.

2. Just to confirm - the referenced table in that forum entry works correctly on the yoga 2 - just follow the directions?

I'm assuming you've also disabled Intel Dynamic Platform Thermal system

 

1) No I set each one lower to about CPU (.04v) cache (.05v) (GPU (.08v). That is a total of about .17V. Each of these have different voltages so it is cumulative if my physics serves me well you are saving a total of .16V to the CHIP. Assuming there is about 15amps (highet VID I saw was about .95 at 27X multiplier) for a 15w TDP chip you are saving about 2-2.5watts at maximum load and less when current decreases.

2) Yes the yoga13 one works perfectly for our yoga pro 2.

Yes I disabled it

 

thanks - on the #2 I got a verify error after the clear flash and it never appears to have flashed - and my EC version remains the same as the bios version - can you confirm sometime if you've got the 66ec42ww version?

 

Where can I check the EC version?

 

boot into the bios and it is on the first page- right below the bios version is the ec version

I should ask what specific solution you implemented from that yoga 13 forum - it had both a bios EC controller change (not too popular) and then some German Fan Controller - did you go with the fan controller?

 

Could you provide a screen shot of your settings, I think I understand all your setting changes, but would like to verify. Thank you for all your input.

 

I went with the fan controller. Sorry I forgot to make that clear

 

from 100%-5% non stop use got 6 hours 35 minutes with the settings above. Watched two episodes of family guy for 50 minutes on flash video. Not quite 7 hrs but not too shabby. Now if we can just get Lenovo to allow our YP2 to go to lower GPU steps then 600mhz we'd see a nice bump in battery life.

 

By the way if you were to disable synaptics touch pad you could expect about 10-12% more battery life. If I do that I could easily reach 7 hrs +

 

When using the program, each increment is by -0.976XXXX. Is there anyway to change it to undervolt not as much?

 

just use the slider

 

OK I did the GPU and Cache, but I don't seem to find the "core" setting. Is the "core" the same as "Dynamic CPU voltage offset"?

 

I had to bring the GPU voltage back to 0.06v because my machine didn't like it. The other two are still the same.
I wanted to ask you what did you disable? something about thermal? thanks.

 

Dptf in the bios

 

Sorry for the noob questions, but what does the Dptf control? Is that what throttles the CPU when in stand or laptop mode? Thanks.
Edit : yup, I answered my only question. DPTF is to throttle your CPU on any other mode except laptop mode.

 

Yes that's the one you change

 

I haven't messed with the fan yet, but I can barely hear it turning or running. I upgraded my BIOS to solve the Yellow issue, but that shouldn't have nothing to do with this correct? Or would it affect the tweak that is posted for the YOGA 13?

 

I am a newbie to anything about the intel extreme tuning ultility, but I'm interested in extending the battery life of my Y2P if the undervolting isn't too complicated to me.

May I ask if I undervolt to the extent you're talking about, is there any potential damages or side effects to the hardware? Or just a little bit of instability of the windows system? Sorry that I don't have much knowledge about that.

 

I was just wandering does it worth bothering with the undervolting? How much extra are you guys getting ?

 

Positive gains in both lower temps and more battery life.. My machine will take -70 on CPU, cache and GPU so far.. I can't get Notebook fan control to work properly or detect the Yoga configs. it looks like the xml files provided are different from what the program is looking for.