[ltp] ThinkPad T520 fan: less rpm recently

[Martin Steigerwald]

Am Samstag, 15. Oktober 2011 schrieb Tino Keitel:
> ------- Original message -------
> 
> > From: Martin Steigerwald <Martin@lichtvoll.de>
> > To: linux-thinkpad@linux-thinkpad.org
> > Sent: 14.10.'11,  23:58
> > 
> > I added "i915.i915_enable_rc6=1" after I read:
> > 
> > Thorsten Leemhuis, Die Woche: Ungenutztes Stromsparpotenzial
> > http://www.heise.de/open/artikel/Die-Woche-Ungenutztes-
> > Stromsparpotenzial-1361381.html
> 
> The disabled RC6 feature is an issue for some time now. Enabling it
> saves a lot of power (8 Watts on my Sandy Bridge desktop), but it
> causes problems on certain setups. Most people should be able to use
> it, though.
> 
> It's sad to see RC6 disabled by default, as it seems to nearly double
> the idle power usage (and half the battery runtime) on otherwise very
> power efficent Intel based subnotebooks.

Its a really huge difference.

With the nine cell battery I got today with one, part time two KDE 4.6 
sessions:


merkaba:~> acpi -b
Battery 0: Discharging, 96%, 08:16:08 remaining
merkaba:~> date
So 16. Okt 18:11:39 CEST 2011
merkaba:~> acpi -b
Battery 0: Discharging, 96%, 07:26:06 remaining
merkaba:~>


merkaba:~> date ; acpi -b
So 16. Okt 18:15:27 CEST 2011
Battery 0: Discharging, 94%, 06:03:21 remaining

^ build slides for the course I hold coming week ^

merkaba:~> date ; acpi -b
So 16. Okt 18:37:20 CEST 2011
Battery 0: Discharging, 90%, 08:26:30 remaining

merkaba:~> date ; acpi -b
So 16. Okt 18:50:59 CEST 2011
Battery 0: Discharging, 87%, 08:35:01 remaining

merkaba:~> date ; acpi -b
So 16. Okt 19:08:31 CEST 2011
Battery 0: Discharging, 84%, 06:41:58 remaining

merkaba:~> date ; acpi -b
So 16. Okt 19:27:29 CEST 2011
Battery 0: Discharging, 80%, 05:46:18 remaining

Listening to music via Amarok while continuing reading PDF.

martin@merkaba:~> date ; acpi -b
So 16. Okt 19:49:02 CEST 2011
Battery 0: Discharging, 74%, 04:11:42 remaining

martin@merkaba:~> date ; acpi -b
So 16. Okt 20:06:04 CEST 2011
Battery 0: Discharging, 68%, 03:53:40 remaining

After a while with automatically switched off display:

merkaba:~> date ; acpi -b
So 16. Okt 20:36:00 CEST 2011
Battery 0: Discharging, 59%, 03:44:35 remaining

merkaba:~> date ; acpi -b
So 16. Okt 20:45:31 CEST 2011
Battery 0: Discharging, 57%, 03:01:49 remaining

martin@merkaba:~> date ; acpi -b      
So 16. Okt 21:09:07 CEST 2011
Battery 0: Discharging, 50%, 02:21:20 remaining


And now from the hotel room:


martin@merkaba:~> date ; acpi -b
So 16. Okt 23:14:54 CEST 2011
Battery 0: Discharging, 43%, 02:13:37 remaining


martin@merkaba:~> date ; acpi -b
So 16. Okt 23:19:21 CEST 2011
Battery 0: Discharging, 41%, 02:22:50 remaining


Seems that the battery could easily last a day. And seems that with the 
additional batteries that are available it might really be possible to use 
a T520 for 24 hours on batteries as Lenovo claims ;).

Ciao,
-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7