----- Original Message ----
From: Stefan Blum <[EMAIL PROTECTED]>
To: rami jiossy <[EMAIL PROTECTED]>
Sent: Thursday, June 14, 2007 4:26:37 PM
Subject: Re: [PATCH] AHCI powersaving and port-stopping (2.6.22-rc4)
Hi, I have it running with the patch from John. However, I do not see
powersavings amounting to 1W.
>> i did the test on SantaRosa laptop and measured battery gain by recording
>> battery drain rate. i did see improvement of ~1.2W or 1W when playing DVD.
I just measured (console only, everything unloaded)
AHCI powersaving off: between 10.0W and 10.5W
AHCI powersaving on: between 9.7W and 10.0W
both measured for a couple of minutes with the notebook just sitting there.
So I get a max of .5W here...
One thing - when I echo to /sys/module/libata/parameters/powersave, I get the
following output in syslog:
Jun 14 15:25:27 hermes kernel: ATA: abnormal status 0x7F on port 0x00010177
Jun 14 15:25:27 hermes kernel: ata1.00: ata_hpa_resize 1: sectors = 195371568,
hpa_sectors = 195371568
Jun 14 15:25:27 hermes kernel: ata1.00: ata_hpa_resize 1: sectors = 195371568,
hpa_sectors = 195371568
Jun 14 15:25:27 hermes kernel: ata1.00: configured for UDMA/100
Jun 14 15:25:27 hermes kernel: sd 0:0:0:0: [sda] 195371568 512-byte hardware
sectors (100030 MB)
Jun 14 15:25:27 hermes kernel: sd 0:0:0:0: [sda] Write Protect is off
Jun 14 15:25:27 hermes kernel: sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
Jun 14 15:25:27 hermes kernel: sd 0:0:0:0: [sda] Write cache: enabled, read
cache: enabled, doesn't support DPO or FUA
Do you get that too (on an x60s I suppose?)
>> i got the same thing, its just fine
Regards, Stefan
On Thursday 14 June 2007 15:01, you wrote:
> i've tried the attached patch for kernel 2.6.22-rc4. it saves around ~1W.
>
> remember, you need to enable the AHCI power saving in the sysfs as
> described below.
>
>
> ----- Original Message ----
> From: Stefan Blum <[EMAIL PROTECTED]>
> To: [email protected]
> Sent: Thursday, June 14, 2007 12:42:57 PM
> Subject: Re: [PATCH] AHCI powersaving and port-stopping (2.6.22-rc4)
>
>
> Hi, I'm also using a x60s and would be interested to try out this patch.
> What other patches did you apply to your 2.6.22 kernel, and which config
> did you use?
>
> Regards, Stefan
>
> On Monday 11 June 2007 12:54, John Fremlin wrote:
> > Tejun Heo has made an excellent patch for saving power with the AHCI
> > chipset. It saves about 1 W on my Thinkpad X60s.
> >
> > This patch will stop the ports when they are idle. To turn it on,
> >
> > echo 1 > /sys/module/libata/parameters/powersave
> >
> > This is very different from the patch I posted a while ago turning on
> > a few bits in the CMD register (ALPE and ASP) and which Intel is
> > apparently now trying. That only saves around 250mW. Tejun's patch
> > saves about 1 W. It should also make the ALPE and ASP stuff irrelevant
> > because it performs the same operation in software where better
> > information about usage is (theoretically) available.
> >
> > I have updated the patch for 2.6.22-rc4. That is the extent of my
> > involvement - if it works, thank Tejun Heo. But problems are quite
> > likely to have been introduced by my clumsy update, so if it doesn't
> > work, blame me first.
>
> _______________________________________________
> Power mailing list
> [email protected]
> http://www.bughost.org/mailman/listinfo/power
>
>
>
> ___________________________________________________________________________
>_________ Sucker-punch spam with award-winning protection.
> Try the free Yahoo! Mail Beta.
> http://advision.webevents.yahoo.com/mailbeta/features_spam.html
____________________________________________________________________________________
Get your own web address.
Have a HUGE year through Yahoo! Small Business.
http://smallbusiness.yahoo.com/domains/?p=BESTDEAL
_______________________________________________
Power mailing list
[email protected]
http://www.bughost.org/mailman/listinfo/power
