Santa Rosa T61 and R61 both idle at 1600 MHz (not 1200 MHz)

[Pascal_TTH]

I got two Thinkpad Santa Rosa : T61 and R61. With Windows Vista Lenovo installation, their idle at 1600 MHz. I never see them at 1200 MHz witch is the normal speedstep lowest speed. Whatever I use Sandra, CPU-Z or Windows, they repport 1600 MHz. At full speed, there is any issue, frequency is right (2 GHz for the T61 and 1,8 GHz for the R61).

I swap the hard drives with news 7200 rpm. I install Windows XP with all update and they also idle at 1600 MHz. With my T60p and T41p, just after Windows XP install, even before any driver, the CPU idle at the right speed. Yestery, I went to a friend with a Santa Rosa HP, is was at 1200 MHz during idle. The Santa Rosa speed have strange behavior with Thinkpad.

I already check : Any back ground process use the CPU. Idle task is at 98 to 99%.


Does other people have the same issue ?

[SHoTTa35]

not sure at the rest but "System Idle" should be at 99% most of the time when the system is idle anyways It's 99% idle

I'm not sure about the 1600 vs 1200mhz thing tho.

[sugo]

It should actually idle at 800MHz.

[danny_isr]

1600 here too , i had a post here already about this.

would be nice the reduce that.

[Daniel]

It's because of the FSB clocking down to half speed. The only accurate frequency checking tool is the Intel Thermal Analysis Tool. No other programs are able to read the frequency of the processor correctly.

[Pascal_TTH]

Daniel, your right. I found the explanation in this document page 11 : ftp://download.intel.com/design/mobile/ ... 407914.pdf

This is what Intel calls SLFM. So Santa Rosa Core 2 Duo can run

800 MHz 8 x 100 MHz SLMF
1200 MHz 6 x 200 MHz
1400 MHz 7 x 200 MHz
... unitl
Max MHz n x 200 MHz

If only one core is used, it can go 200 MHz higher then the normal speed. So, (n + 1) x 200 MHz. It's IDA.

[Tailic]

Try setting your power profile to adaptive, it'll throttle the cpu down to 800mhz when on idle.

[danny_isr]

Try setting your power profile to adaptive, it'll throttle the cpu down to 800mhz when on idle.

Do you really believe that we left it at Max Performance ?

[Pascal_TTH]

Franck is writting a new version of CPU-Z. I got a beta now running. It shows 800 MHz in idle. He tells me it was an hard job due to this Super LFM...