https://bugzilla.kernel.org/show_bug.cgi?id=56071 Thomas Renninger <trenn@xxxxxxx> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED CC| |trenn@xxxxxxx Resolution| |DOCUMENTED --- Comment #5 from Thomas Renninger <trenn@xxxxxxx> 2013-04-02 07:53:34 --- > limiti hardware: 1.30 GHz - 2.10 GHz This should not be possible. The interface to limit frequency is a number. For example 0 means no limitation, 1 means the highest frequency is limited. Ah wait, I think I know what happens. This is read out from the HW (and applies to CPU specs): Boost States: 2 Total States: 7 Pstate-Pb0: 2600MHz (boost state) Pstate-Pb1: 2300MHz (boost state) Pstate-P0: 2100MHz Pstate-P1: 1800MHz Pstate-P2: 1500MHz Pstate-P3: 1300MHz Pstate-P4: 900MHz This is done to be able to show available boost states and is normally hidden, also the kernel does not know about this! The kernel gets the supported CPU frequency table from the BIOS via ACPI. And your BIOS vendor decided to hide the 900MHz. That's ok, because on latest CPUs (and your one probably is a rather new platform, because it supports boost states and therefore also suppports C-, CPU sleep states) the kernel will enter deep sleeps states when idle which is even more efficient than 900MHz CPU frequency. I already close this one documented. Everything works as designed. -- Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug. -- To unsubscribe from this list: send the line "unsubscribe cpufreq" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
