[Bug 275866] New: Intel Core 2 Duo reports wrong speed
https://bugzilla.novell.com/show_bug.cgi?id=275866 Summary: Intel Core 2 Duo reports wrong speed Product: openSUSE 10.2 Version: Final Platform: x86-64 URL: http://www.suseforums.net/index.php?showtopic=34123 OS/Version: openSUSE 10.2 Status: NEW Severity: Normal Priority: P5 - None Component: Basesystem AssignedTo: bnc-team-screening@forge.provo.novell.com ReportedBy: ascendant256@yahoo.com QAContact: qa@suse.de The dynamic CPU frequency scaling mechanism does not detect the frequency of my processor correctly. Relevant hardware: motherboard ECS P965T-A http://www.ecs.com.tw/ECSWebSite/Products/ProductsDetail.aspx?DetailID=681&CategoryID=1&DetailName=Feature&MenuID=44&LanID=9 Attention---v Northbridge: Intel P965 Express Southbridge: Intel ICH8 BIOS is newest available. CPU Intel Core 2 Duo E6400 Attention---v normal operating frequency: 2130MHz current operating frequency: 2660 MHz detected operating frequency: 800 MHz The scaler detects two possible frequencies, 600MHz and 800MHz. While the system is supposedly running at 800MHz, it is running at the full 2600MHz. While it is supposedly running at 600 MHz, it is actually running at (around) 1900MHz. These numbers are based on times for SuperPI and assuming proportional time performance numbers to actual MHz. I have not been able to test whether or not this same error occurs with other Linux OSs or kernels. Disabling SpeedStep in the BIOS seems not to have an effect. below is the output of cat /proc/cpuinfo : processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 CPU 6400 @ 2.13GHz stepping : 6 cpu MHz : 600.000 cache size : 2048 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 2 fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm constant_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr lahf_lm bogomips : 5323.86 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 CPU 6400 @ 2.13GHz stepping : 6 cpu MHz : 600.000 cache size : 2048 KB physical id : 0 siblings : 2 core id : 1 cpu cores : 2 fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm constant_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr lahf_lm bogomips : 5320.38 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is.
https://bugzilla.novell.com/show_bug.cgi?id=275866 mhorvath@novell.com changed: What |Removed |Added ---------------------------------------------------------------------------- AssignedTo|bnc-team- |kernel-maintainers@forge.provo.novell.com |screening@forge.provo.novell| |.com | -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is.
https://bugzilla.novell.com/show_bug.cgi?id=275866
User gregkh@novell.com added comment
https://bugzilla.novell.com/show_bug.cgi?id=275866#c1
Greg Kroah-Hartman
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