[Bug 19262] New: CPU0 locked at slower speed, regardless of governor

[Bug 19262] New: CPU0 locked at slower speed, regardless of governor

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https://bugzilla.kernel.org/show_bug.cgi?id=19262

           Summary: CPU0 locked at slower speed, regardless of governor
           Product: Power Management
           Version: 2.5
    Kernel Version: 2.6.36-rc5-00226-g050026f
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: cpufreq
        AssignedTo: cpufreq@vger.kernel.org
        ReportedBy: aexoden@gmail.com
        Regression: Yes


Created an attachment (id=31732)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=31732)
output of `cat /proc/cpuinfo`

Hardware: Intel Q6600 2.4Ghz (clocked at 2.8Ghz)
Software: Gentoo Linux ~amd64, running Linus's HEAD.

Problem description:
The first core appears to be locked at a slower speed. The CPU has two
potential speeds: the maximum speed and and the maximum speed divided by 1.5.
CPU2, 3, and 4 all operate correctly at 2.8Ghz, while CPU0 remains stuck at
1.87Ghz. The problem is observed at stock speeds. I don't remember when it
first appeared, but I believe it was 2.6.34.

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[Bug 19262] CPU0 locked at slower speed, regardless of governor

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https://bugzilla.kernel.org/show_bug.cgi?id=19262





--- Comment #1 from Jason Lynch <aexoden@gmail.com>  2010-09-28 19:10:22 ---
Created an attachment (id=31742)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=31742)
sysfs information

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[Bug 19262] CPU0 locked at slower speed, regardless of governor

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https://bugzilla.kernel.org/show_bug.cgi?id=19262





--- Comment #2 from Jason Lynch <aexoden@gmail.com>  2010-09-28 19:11:26 ---
Created an attachment (id=31752)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=31752)
dmesg with cpufreq.debug=7

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[Bug 19262] CPU0 locked at slower speed, regardless of governor

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https://bugzilla.kernel.org/show_bug.cgi?id=19262


Jason Lynch <aexoden@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #31732|application/octet-stream    |text/plain
          mime type|                            |




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[Bug 19262] CPU0 locked at slower speed, regardless of governor

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https://bugzilla.kernel.org/show_bug.cgi?id=19262


Jason Lynch <aexoden@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #31742|application/octet-stream    |text/plain
          mime type|                            |




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[Bug 19262] CPU0 locked at slower speed, regardless of governor

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https://bugzilla.kernel.org/show_bug.cgi?id=19262


Jason Lynch <aexoden@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #31752|application/octet-stream    |text/plain
          mime type|                            |




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[Bug 19262] CPU0 locked at slower speed, regardless of governor

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https://bugzilla.kernel.org/show_bug.cgi?id=19262


Thomas Renninger <trenn@suse.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|                            |cpufreq@vger.kernel.org,
                   |                            |trenn@suse.de
         AssignedTo|cpufreq@vger.kernel.org     |trenn@suse.de




--- Comment #3 from Thomas Renninger <trenn@suse.de>  2010-09-30 08:51:40 ---
Looks like the passive temperature threshold is exceeded for CPU0.
Hm, typically there is one thermal sensor/device connected to all CPUs, but if
this is related to the problem, CPU0 would have its own thermal device.
Can you provide:
for x in /proc/acpi/thermal_zone/*/*;do
       echo $x
       cat $x
       echo
done

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[Bug 19262] CPU0 locked at slower speed, regardless of governor

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https://bugzilla.kernel.org/show_bug.cgi?id=19262





--- Comment #4 from Jason Lynch <aexoden@gmail.com>  2010-09-30 09:46:37 ---
Here is the requested information:

/proc/acpi/thermal_zone/THRM/cooling_mode
0 - Active; 1 - Passive

/proc/acpi/thermal_zone/THRM/polling_frequency
<polling disabled>

/proc/acpi/thermal_zone/THRM/state
state:                   ok

/proc/acpi/thermal_zone/THRM/temperature
temperature:             20 C

/proc/acpi/thermal_zone/THRM/trip_points
critical (S5):           255 C
passive:                 0 C: tc1=4 tc2=3 tsp=60 devices=CPU0

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[Bug 19262] CPU0 locked at slower speed, regardless of governor

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https://bugzilla.kernel.org/show_bug.cgi?id=19262


Thomas Renninger <trenn@suse.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|cpufreq                     |Power-Thermal
         AssignedTo|trenn@suse.de               |acpi_power-thermal@kernel-b
                   |                            |ugs.osdl.org
            Product|Power Management            |ACPI




--- Comment #5 from Thomas Renninger <trenn@suse.de>  2010-09-30 12:35:45 ---
... and this is the bug, probably BIOS related:

/proc/acpi/thermal_zone/THRM/trip_points
passive:                 0 C: tc1=4 tc2=3 tsp=60 devices=CPU0

Please also attach dmesg and acpidump output.

The param to workaround this issue is:
thermal.psv = 50
to e.g. let the CPU get throttled at 50 C.

There already is a blacklist in drivers/acpi/thermal.c:
static struct dmi_system_id thermal_dmi_table[] __initdata = {
...
        {
         .callback = thermal_psv,
         .ident = "AOpen i915GMm-HFS",
         .matches = {
                DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
                DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
                },
        },

Also attach dmidecode, if we do not find a generic kernel workaround/fix the
BIOS can get blacklisted to not use the passive trip point by default.

Reassigning to ACPI component -> this is an acpi problem.

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[Bug 19262] CPU0 locked at slower speed, regardless of governor

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https://bugzilla.kernel.org/show_bug.cgi?id=19262





--- Comment #6 from Jason Lynch <aexoden@gmail.com>  2010-09-30 21:23:06 ---
Created an attachment (id=32122)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=32122)
acpidump

I had previously attached dmesg. If there's something I missed, or if I didn't
do the acpidump correctly (just ran acpidump with no parameters), let me know.

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[Bug 19262] CPU0 locked at slower speed, regardless of governor

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https://bugzilla.kernel.org/show_bug.cgi?id=19262





--- Comment #7 from Jason Lynch <aexoden@gmail.com>  2010-09-30 21:24:29 ---
Created an attachment (id=32132)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=32132)
dmidecode

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[Bug 19262] CPU0 locked at slower speed, regardless of governor on IP35 Pro(Intel P35-ICH9R)

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https://bugzilla.kernel.org/show_bug.cgi?id=19262


Thomas Renninger <trenn@suse.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |DOCUMENTED
            Summary|CPU0 locked at slower       |CPU0 locked at slower
                   |speed, regardless of        |speed, regardless of
                   |governor                    |governor on IP35 Pro(Intel
                   |                            |P35-ICH9R)




--- Comment #8 from Thomas Renninger <trenn@suse.de>  2010-10-01 15:12:07 ---
Best is you go with the mentioned boot param workaround.
There is something rather fishy with the implementation of the thermal trip
points. There are some iasl errors/warnings which point to thermal/temp:
DSDT.dsl  5685:         Store (GAHC (Arg0, Arg1), Local4)
Warning  1093 -                   ^ Called method may not always return a value

DSDT.dsl  5723:     Method (GAHC, 2, NotSerialized)
Warning  1088 -                ^ Not all control paths return a value (GAHC)

DSDT.dsl  5798:                         Store (GAHS (0x00), Local6)
Error    4061 -    Called method returns no value ^

The code there does not make much sense to me:
  - Passive cooling device only CPU0
  - Quite some storing of the same things:
GAHC():
        Store (0x01, DTAP)
        Stall (0x7F)
        Store (0x6C, DTAP)
        Stall (0x7F)
        Store (DTAP, Local5)
        Stall (0x7F)
        Store (DTAP, Local6)
        Stall (0x7F)
        Store (DTAP, Local7)
-> Ok, there is IO behind, still this cannot make much sense...

The temperature should also be 20C fixed, because of
    Method (GAHS, 1, NotSerialized)
    {
    }

_TMP():
    Store (GAHS (0x00), Local6)
    And (Local6, 0x01, Local6)
    If (LEqual (Local6, 0x01)) {..}
etc., etc....

The thermal ACPI stuff is really totally messed up on this system, best is to
use thermal.psv=-1 (afaik) to disable passive cooling.

-> Closing resolved documented, not much that can be done from OS side.

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[Bug 19262] CPU0 locked at slower speed, regardless of governor on IP35 Pro(Intel P35-ICH9R)

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https://bugzilla.kernel.org/show_bug.cgi?id=19262





--- Comment #9 from Thomas Renninger <trenn@suse.de>  2010-10-01 15:15:52 ---
Eh, you might want to write a tiny a patch to blacklist this machine to not use
passive cooling automatically as described in comment #5 and send it to the
acpi list. You can read out needed info from dmidecode.
If you do this, please let me know and the bug can be set fixed.

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[Bug 19262] CPU0 locked at slower speed, regardless of governor on IP35 Pro(Intel P35-ICH9R)

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https://bugzilla.kernel.org/show_bug.cgi?id=19262


Zhang Rui <rui.zhang@intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rui.zhang@intel.com




--- Comment #10 from Zhang Rui <rui.zhang@intel.com>  2010-10-19 00:54:57 ---
As the _TMP returns fixed value, I suggest Jason to either update the BIOS to
see if the situation is improved, or disable the ACPI thermal driver because it
will never work with this BIOS.

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[Bug 19262] CPU0 locked at slower speed, regardless of governor on IP35 Pro(Intel P35-ICH9R)

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https://bugzilla.kernel.org/show_bug.cgi?id=19262


Len Brown <lenb@kernel.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED
                 CC|                            |lenb@kernel.org
          Component|Power-Thermal               |BIOS
         AssignedTo|acpi_power-thermal@kernel-b |acpi_bios@kernel-bugs.osdl.
                   |ugs.osdl.org                |org




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