On Friday 09 May 2008, Alex Villacís Lasso wrote: > In a somewhat old computer I use at home, I have a Pentium 4 CPU running > at 1.7GHz. On this computer, acpi-cpufreq does not work (modprobe fails > with -ENODEV), only p4-clockmod. Lately this means I have to compile my > own kernel to get speed throttling on my computer. > > Recently, patch ed9cbcd40004904dbe61ccc16d6106a7de38c998 (Revert > "speedstep-lib.c: fix frequency multiplier for Pentium4 models 0&1") > broke clock speed reporting. It now reports I have a max speed of 13.80 > GHz instead of 1.7GHz. I only wish my CPU were that fast... Reverting > this patch fixes the problem for me. However, since I suscribed > yesterday to this list, I see talk about removing p4-clockmod altogether > from the tree. Maybe my real problem is that acpi-cpufreq does not work > even though it should, but I have yet to find a way to make the module > print the information that is supposed to be displayed through dprintk() > messages. What else can I do to debug acpi-cpufreq on my machine? Assuming this is a laptop with a batter, I'd certainly be interested if you could run BLTK and measure any benefit to p4-clockmod (I've never been able to) http://www.lesswatts.org/projects/bltk/ Re: acpi-cpufreq Verify that you're running the latest BIOS, and look in BIOS SETUP for any options related to CPU power management, Speed Step, EIST, P-states etc, and enable if present. If that doesn't do it, then open a bug here complaining that acpi-cpufreq doesn't load: http://bugzilla.kernel.org/enter_bug.cgi?product=ACPI and attach the output from acpidump -- which will tell us if the underlying BIOS support is present. My guess is that it is not. -Len -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
