On Fri, 2009-04-10 at 13:07 -0700, Nataraj wrote: > On Fri, 2009-04-10 at 11:37 -0400, JohnS wrote: > > On Fri, 2009-04-10 at 12:16 +0100, Karanbir Singh wrote: > > > Mark Pryor wrote: > > > > Using kernel: > > > > 2.6.18-92.1.13.el5.centos.plus > > > > the cpu throttling works as desired (see 2 traces below) > > > ... > > > > When I update to the newer xx-128.1.6 centosplus kernel all the throttling stops and the box runs at highest speed. > > > > > > This is an issue that came up in the early 5.2 days, and has been > > > recurring since. I lost cpuspeed control on my desktop at home as well ( > > > amdx24800/m2n) with the kernel update. Have not started digging into > > > this, but the last time I did upstream blamed it on badly done acpi code > > > in the system BIOS. It *should* now be possible to blacklist the > > > powernow-k8.ko code and let the kernel fallback to using the generic > > > acpi layer again. YMMV. > > --- > > Good thing to know it's just not happening to me also. I also have > > client machines this has affected and my own personal machines. This was > > with the p4-clockmod driver. Motherbords all were Asus. Also affected > > one Celeron machine on an Asus board. > > > > JohnStanley > > I have some older socket 604 533 FSB Xeon's with supermicro x5da8 > motherboards and I've never gotten any of the power management, or even > the poweroff or suspend command to work with any linux kernel on these > boards. The bios code could be blamed, but I've booted other OSes that > are capable of doing power management on this board. > > In any case, are there particular motherboards, i.e. Intel, Tyan, Asus, > Supermicro and/or brands of systems, i.e. Dell, HP that are known to > work well with CentOS and support power management properly? > > Nataraj --- I can say that the one with the Celeron Processor has an Asus OEM Board but it is a Compaq/Hp System and Suspend does work on it. Now all my desktops I have suspend turned off. That particular one i had to manually load the driver restart cpuspeed and acpi. Pretty much all Dell Server systems had the on-demand governor loaded with I dislike. Also that is correct that some Bioses are not compatable. Some brands of boards I would never suspect it to work. JohnStanley