https://bugzilla.kernel.org/show_bug.cgi?id=14771 Robert Bradbury <robert.bradbury@xxxxxxxxx> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |robert.bradbury@xxxxxxxxx --- Comment #17 from Mike Frysinger <vapier@xxxxxxxxxx> 2010-05-10 19:13:54 --- i did try processor.ignore_ppc=1 before and it didnt work. just tried again with latest version (2.6.33.x) and it seems to work now. i can switch governors and the max version is no longer forced to 800mhz. whether the issue is in my ACPI tables, i did post full dumps of them, but i dont know enough about ACPI to say that's the problem absolutely. if Petr finds the command line option works for him too, i'll close the issue ... --- Comment #18 from Robert Bradbury <robert.bradbury@xxxxxxxxx> 2010-06-25 06:44:24 --- Mike, I looked at the output of your acpidump. It looks as if there is no "_PCT" section in your ACPI Bios which means that the acpi-cpufeq module may not be able to function to scale CPU speeds. In that case one needs to use and control speeds using the ondemand scheduler. The problem is that the "ondemand" scheduler has effectively been broken been since circa Linux 2.6.30. See Gentoo Bug #287463 esp. comments #20 & #21. Either your core 2 CPU doesn't support "enhanced" Intel SpeedStep or Dell stuck you with an older ACPI BIOS which was not designed to work with "enhanced" CPUs. This can be dealt with by "reverting" p4-clockmod.c to the pre-2.6.30 state (p4-clockmod.changes attachment to Bug #287463) or by upgrading your ACPI BIOS DSDT table to a more modern variant which includes the _PCT section compatible with your CPU. Linux allows one to configure a user defined DSDT file but I don't have any examples of what one should look like for "Enhanced" SpeedStep CPU's to see if it would work with my old Pentium IV Prescott CPU. If you are going to attempt to use acpi-cpufreq then you really want to enable ACPI debugging to see in greater detail what is going on with the ACPI BIOS. -- 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
