Messages in this thread | | | Date | Tue, 22 May 2007 08:25:59 -0600 | From | Robert Hancock <> | Subject | Re: Enabling power states for Core 2 Duo |
| |
Paa Paa wrote: > For some reason I'm not able to enable processor power states (c1, c2 > etc.) for my Core 2 Duo. This is what I get:: > > cat /proc/acpi/processor/CPU1/info > processor id: 0 > acpi id: 1 > bus mastering control: no > power management: no > throttling control: no > limit interface: no > > cat /proc/acpi/processor/CPU1/power > active state: C0 > max_cstate: C8 > bus master activity: 00000000 > maximum allowed latency: 2000 usec > states: > > "dmesg | grep -i power" also gives nothing. I have ACPI enabled in BIOS > and in kernel I have these set ("grep -i acpi .config | grep =y"): > > CONFIG_ACPI=y > CONFIG_ACPI_PROCESSOR=y > CONFIG_ACPI_THERMAL=y > CONFIG_ACPI_EC=y > CONFIG_ACPI_POWER=y > CONFIG_ACPI_SYSTEM=y > CONFIG_X86_ACPI_CPUFREQ=y > CONFIG_PNPACPI=y > CONFIG_SATA_ACPI=y > > I'm probably missing something crucial here. So how do I enable power > states? I'm using 64-bit Gentoo. My mobo is Asus P5B Deluxe. Otherwise > ACPI works fine.
The BIOS has to expose this support in ACPI, if it doesn't (which is often the case on desktop boards) you won't get any C-state support (well, except for C1 which is just the normal halt state).
-- Robert Hancock Saskatoon, SK, Canada To email, remove "nospam" from hancockr@nospamshaw.ca Home Page: http://www.roberthancock.com/
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |