https://bugzilla.kernel.org/show_bug.cgi?id=16072 --- Comment #15 from Robert Bradbury <robert.bradbury@xxxxxxxxx> 2010-10-22 21:09:24 --- This shiould not be closed as an "undicumemented bug". The machine is a standard HP Pavilion A630N machine (presumably which hundreds of thousands were manufactured in the 2003-2005 time frame). In monitoring the Gentoo bug framework I am aware that there are laptops being manufactured to date (2010) which contain Bios which do not contain the proper code to properly inform about the BIOS capabilities. In short there are still machines which exist out there which WILL NOT PERFORM properly on what ACPI code is supposed to exisit. Because it doesn't exist or cannot be programmed into the machines. The P4-clockmod change was/is wrong -- the P4 clockmod driver worked fine for these machines before the "correction" I have a machine which works fine backing down to 1.75 GHz or even 750 Mhz. And I can watch the power consumption decrease on a Watt-Meter which the machine is plugged into. Though I am running a gentoo-2.6.35-r10 kernel (whiich I presume is roughly equivalent to the final release of 2.6.35. The p4-clockmod, e.g. arch/x86/kernel/cpu/cpufreq/p4-clockmod.c is backtracked to ~the 2.6.28 release (or perhaps somehat later) Because that is the release which worked on these machines. Subsequent releases do not allow P4 clockmod control and are therefore worthless. There are two dividing lines -- some people want their machine to be responsive -- and that may have prompted the change in p4-clockmod.c And there are others who may have reasons to leave their computers on (such as to provide web services) who may desire minimal CPU/power consumption at all times. The current p4-clockmod.c situation prevents that and that is why I am forced to run an older instantiation of that driver. It is not a problem which can be resolved by throwing out the older or un-upgraded (in terms of BIOS capabilities with respect to ACPI). The proper response is for Linux to determine if the machine does have advanced ACPI control capanilities -- and if it does not allow for old-style P4 clockmod fallback.. Because that is what works and it should not be a Linux position to force people into less than 5 y.o. machines. p4-clocmod.c used to work perfectly in reducing power consumption. It currently does not. Thus in the current release of Linux it cannot be viewed as being "green". -- 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
