[Bug 9848] New: acpi-cpufreq: Incomplete freq list on ASUS P5N32-E SLI PLUS with Intel(R) Core(TM)2 Quad

[Bug 9848] New: acpi-cpufreq: Incomplete freq list on ASUS P5N32-E SLI PLUS with Intel(R) Core(TM)2 Quad

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=9848

           Summary: acpi-cpufreq: Incomplete freq list on ASUS P5N32-E SLI
                    PLUS with Intel(R) Core(TM)2 Quad
           Product: Power Management
           Version: 2.5
     KernelVersion: 2.6.24
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: cpufreq
        AssignedTo: cpufreq@www.linux.org.uk
        ReportedBy: patrol@sinus.cz
                CC: venkatesh.pallipadi@intel.com, trenn@suse.de


Latest working kernel version: N/A
Earliest failing kernel version: 2.6.23 (earlier kernels not tested)
Distribution: Vanilla kernel (no commonly known distro)
Hardware Environment:ASUS P5N32-E SLI PLUS MoBo, Intel(R) Core(TM)2 Quad CPU
(with constant TSC), 2G RAM
Software Environment:64bit binary (x86 Linux architecture), vanilla kernel,
booted by LILO, latest BIOS (0901)
Problem Description: Only 600 and 900Mhz clocks available in cpufreq-acpi. The
real CPU clock is 2.6 GHz - it is 2.4G CPU with overclocked FSB. When the
"Intel Enhanced Speedstep" feature is disabled in the BIOS, system runs at 2.6G
and cpufreq is not available. When the feature is enabled, the system seems to
run at 900M with no possibility to accelerate, just decelerate to 600M. 
Steps to reproduce: Use the above mobo/cpu, enable "Enhanced Intel Speedstep"
in BIOS, load 2.6.24 kernel with acpi-cpufreq.


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[Bug 9848] acpi-cpufreq: Incomplete freq list on ASUS P5N32-E SLI PLUS with Intel(R) Core(TM)2 Quad

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=9848





------- Comment #1 from patrol@sinus.cz  2008-01-30 00:56 -------
Created an attachment (id=14646)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=14646&action=view)
Symptoms of the bug: dmesg (with cpufreq.debug=7), /proc/cpuinfo, acpidump,
contents of /sys/devices/system/cpu/cpu0/*


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[Bug 9848] acpi-cpufreq: Incomplete freq list on ASUS P5N32-E SLI PLUS with Intel(R) Core(TM)2 Quad

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=9848





------- Comment #2 from patrol@sinus.cz  2008-01-30 00:58 -------
Created an attachment (id=14647)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=14647&action=view)
SSDT tables which appear only with Enhanced Intel Speedstep active in BIOS.
They are not dumped by acpidump.


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[Bug 9848] acpi-cpufreq: Incomplete freq list on ASUS P5N32-E SLI PLUS with Intel(R) Core(TM)2 Quad

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=9848


trenn@suse.de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|cpufreq@www.linux.org.uk    |trenn@suse.de
             Status|NEW                         |ASSIGNED




------- Comment #3 from trenn@suse.de  2008-02-27 07:51 -------
This is the relevant part in one of the SSDTs.
You can search the ACPI spec for _PSS to be able to evaluate what exactly is
returned. It is either NPSS or SPSS which both include two frequencies with:
 a) 900 MHz (0x384)
 b) 600 MHz (0x258)

So this is a BIOS issue.
You may be able to tell more whether the value 900 MHz (and you enter real max,
2,6 GHZ or similar) or not by evaluating the other values, but I expect you
need Intel's/Venkatesh's help here.
But it would not make sense much anyway, this should get fixed in BIOS.


        Method (_PSS, 0, NotSerialized)
        {
            If (LOr (And (CFGD, 0x4000), And (CFGD, 0x00010000)))
            {
                Return (NPSS)
            }

            Return (SPSS)
        }

        Name (SPSS, Package (0x02)
        {
            Package (0x06)
            {
                0x00000384, 
                0x000157C0, 
                0x000000A0, 
                0x0000000A, 
                0x00000036, 
                0x00000000
            }, 

            Package (0x06)
            {
                0x00000258, 
                0x0000E678, 
                0x000000A0, 
                0x0000000A, 
                0x00000136, 
                0x00000001
            }
        })
        Name (NPSS, Package (0x02)
        {
            Package (0x06)
            {
                0x00000384, 
                0x000157C0, 
                0x0000000A, 
                0x0000000A, 
                0x00000925, 
                0x00000925
            }, 

            Package (0x06)
            {
                0x00000258, 
                0x0000E678, 
                0x0000000A, 
                0x0000000A, 
                0x0000061B, 
                0x0000061B
            }
        })
    }


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