maemo.org - Talk - View Single Post - Saving battery power with underclocking, low voltage etc.

	tonism	2010-05-06 , 09:10
	Posts: 20 \| Thanked: 37 times \| Joined on May 2010 @ Estonia	#101

Here is the latest starving configuration for titan kernel!

See the details, as usual:

PHP Code:


			
     default LV      ULV     XLV     ideal   starving

0    0,9750  0,9750  0,9125  0,8500          0,8750

125  0,9750  0,9750  0,9125  0,8500          0,8750

250  1,0750  1,0750  0,9125  0,9750          0,9500

500  1,2000  1,2000  1,0125  1,0125  0,9750  0,9625

550  1,2750  1,2000  1,0750  1,0750  1,0125  1,0000

600  1,3500  1,2750  1,0750  1,0750  1,0750  1,0250

700  1,3500  1,2750  1,1625  1,1625  1,1625  1,1125

750  1,3500  1,2750  1,1625  1,1625  1,1625  1,1250

805  1,3500  1,2750  1,2000  1,2000  1,2000  1,1625

850  1,3500  1,2750  1,2000  1,2000  1,2000  1,1750

900  1,3500  1,2750  1,2750  1,2750  1,2750  1,2125

950  1,3500  1,2750  1,2750  1,2750  1,2750  1,2375

1000 1,3500  1,3500  1,3500  1,3500  1,3500  1,2875

1100 1,5000  1,5000  1,5000  1,5000  1,5000  1,3875

1150 1,5000  1,5000  1,5000  1,5000  1,5000  1,4625

Nice voltage graph: http://tonism.2bit.ee/N900/starving.png

250 - 550 MHz conf: http://tonism.2bit.ee/N900/starving550
Default speed conf: http://tonism.2bit.ee/N900/starving
250 - 700 MHz conf: http://tonism.2bit.ee/N900/starving700
250 - 900 MHz conf: http://tonism.2bit.ee/N900/starving900
250 - 1150 MHz conf: http://tonism.2bit.ee/N900/starving1150

The default speed conf has voltage profiles for all speeds. Other confs skip some speeds.

The problem that I found was with the lower end frequencies. As you can see, ULV and XLV have some pretty strange lower end when comparing to the rest of the graph. I was able to get it stable while idle too with so extremely low voltages, but when I increased the workload there was just no way I could do anything. So my guess is that ULV & XLV low frequency range is not properly tested.

But this is my lowest stable conf for titan kernel. As always, use at your own risk and if they aren't stable for you, your N900 probably won't tolerate so low voltages. In that case try some of the titan's confs. But ULV & XLV voltages at the low frequencies seem little odd to me.

__________________
starving configuration for titan kernel

Last edited by tonism; 2010-06-25 at 23:25.

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