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epitaph is offline epitaph
2011-03-30 , 09:45
Banned | Posts: 358 | Thanked: 160 times | Joined on Dec 2010
#31
Originally Posted by vi_ View Post
Yes! the battery life savings are insane! some report easily 1/4 longer battery.

I use:

When device is locked:250-500, starving voltage profile with SR.
When device unlocked:500-805, starving voltage profile with SR.

when under heavy use I press turbo mode button which 'timeouts' back to the above:
600-1000, starving voltage profile, screen blanking @1.5minutes.

This is all automated with dbus-scripts. It allows for max battery whenThe thing is in my pocket(most of the time) and power when I am actually using it.
You are just kidding, starving profile didn't work for everybody.
 
vi_ is offline vi_
2011-03-30 , 10:01
Posts: 1,680 | Thanked: 3,685 times | Joined on Jan 2011
#32
Originally Posted by epitaph View Post
You are just kidding, starving profile didn't work for everybody.
Gah, GTFO u time wasting nub.

While starving MAY not work for your device (it probably will) it is always good to try. If it does not, step up to 'ideal'.

Just keep asking questions and re-reading the overclock guide shown above till you get it.

I'll just leave this here...

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epitaph is offline epitaph
2011-03-30 , 10:09
Banned | Posts: 358 | Thanked: 160 times | Joined on Dec 2010
#33
Originally Posted by vi_ View Post
Gah, GTFO u time wasting nub.

While starving MAY not work for your device (it probably will) it is always good to try. If it does not, step up to 'ideal'.

Just keep asking questions and re-reading the overclock guide shown above till you get it.

I'll just leave this here...

Nice chart, btw, what is _vi meaning? Isn't is Excel. I can do it in < 5 min.
Last edited by epitaph; 2011-03-30 at 10:12.
 
excelar8 is offline excelar8
2011-03-30 , 10:13
Posts: 195 | Thanked: 102 times | Joined on Feb 2010 @ Vancouver, Canada
#34
my kernel limits are 250 to 900 @LV profile:

why is it that most people use 250 as a lower limit? will it be more battery efficient to decrease this to 200?

what are my risks for changing my profile to IDEAL or Starving? it's to my understanding that i will get significant battery life increase? is it safe?
 
epitaph is offline epitaph
2011-03-30 , 10:33
Banned | Posts: 358 | Thanked: 160 times | Joined on Dec 2010
#35
Originally Posted by excelar8 View Post
my kernel limits are 250 to 900 @LV profile:

why is it that most people use 250 as a lower limit? will it be more battery efficient to decrease this to 200?

what are my risks for changing my profile to IDEAL or Starving? it's to my understanding that i will get significant battery life increase? is it safe?
No it's not safe. First it is tweaking the device second try mplayer and some avi's. It happend to me very often a crash of mplayer using starving or any undervolting. It depends on your usage, though.
 
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Switch_ is offline Switch_
2011-03-30 , 10:45
Posts: 601 | Thanked: 549 times | Joined on Mar 2010 @ Redditch, UK
#36
Originally Posted by excelar8 View Post
my kernel limits are 250 to 900 @LV profile:

why is it that most people use 250 as a lower limit? will it be more battery efficient to decrease this to 200?

what are my risks for changing my profile to IDEAL or Starving? it's to my understanding that i will get significant battery life increase? is it safe?
My device runs at 125 - 1000 24-7-365. When it's not processing, drop the CPU speed to the lowest possible number, in this chips case, 125Mhz.

The risk (as with any adjustment of vCore) is instability. What is a greater risk is INCREASING vCore to get higher stability which generates more heat through the resistance of the CPU - but DECREASING vCore will increase battery life (lower voltages = lower pull on resource, resource being battery) lower the temperature of the CPU, but may affect the stability of the device as the square waveform running through the CPU has a chance of degrading.

What will happen is the device reboots. Thats it. Call it a risk if you will, but it's nothing I would be overly concerned with. If you do get a random reboot, then the device will load stock kernel configuration with 250 - 600 limits, as this is a safety net built in to the code of kernel-power.

YES, IT IS SAFE.
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vi_ is offline vi_
2011-03-30 , 10:49
Posts: 1,680 | Thanked: 3,685 times | Joined on Jan 2011
#37
Originally Posted by excelar8 View Post
my kernel limits are 250 to 900 @LV profile:

why is it that most people use 250 as a lower limit? will it be more battery efficient to decrease this to 200?

what are my risks for changing my profile to IDEAL or Starving? it's to my understanding that i will get significant battery life increase? is it safe?
people use 250 as the lower limit as it is a good trade off between power usage and speed for not quite asleep mode. From experimentation it has been empirically shown that the phone lags too much when coming out of 125MHz mode so 250 is generally used as the lower floor. From the chart above you can see the voltage differeance between 125 and 250 is very small and thus power savings are negligable. As far as I know the speed 'stops' are predefined.

The greatest risk of lowering the voltage profile is that the system will reboot under high stress. If this is the case power kernel will tell you when it reboots that there was a problem and your settings have not been applied (so you cannot brick your device with bad settings). If your device does reboot at a low voltage profile then just move 'up' a profile.

Lower voltages use lower power than lower frequencies:

power consumption = capacitance * frequency * voltage^2

i.e. while frequency will affect power consumption it is not a patch on how much voltage affects it (as power consumption is a function of the square of voltage).

Basically, frequency = little effect on power consumption, voltage = huge effect on power consumption.

So in conclusion, for max battery run the lowest voltage profile that works@ maximum of 805MHz with smart reflex enabled.


RIGHT epitath (I shall write the rest in comic sans as it is probably the only font epitath can understand in his twisted brain world of one way man mental)


That is chart plots the voltage at the given frequency stops for each of the voltage profiles (well duh). You could make the chart in 5 mins with excel? Well done, monkey want a 'nana?

You do not know what vi is? really? I mean really? I will just let that hang and speak for itself
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Last edited by vi_; 2011-03-30 at 11:02. Reason: ninja stealth edit for politness
 

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Switch_ is offline Switch_
2011-03-30 , 10:55
Posts: 601 | Thanked: 549 times | Joined on Mar 2010 @ Redditch, UK
#38
Originally Posted by vi_ View Post
RIGHT epitath (I shall write the rest in comic sans as it is probably the only font epitath can understand in his twisted brain world of one way man mental)
LMFAO

Originally Posted by vi_

You could make the chart in 5 mins with excel? Well done, monkey want a 'nana?
I can do it too, can I haz 'nana?

Originally Posted by vi_

You do not know what vi is? really? I mean really?
Sounds better than leafpad_ I guess....
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Last edited by Switch_; 2011-03-30 at 11:02.
 

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ammyt is offline ammyt
2011-03-30 , 11:02
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#39
Donatae epitaph, 'nd he mite give u za bnannanna
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vi_ is offline vi_
2011-03-30 , 11:03
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#40
Originally Posted by Switch_ View Post
I can do it too, can I haz 'nana?
Yes, you may. Just email me your bank sort code & account number and I will bring it over immediatly.
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