[Bug 8720] New: still problems with k7 mobile frequency is lower than real

[Bug 8720] New: still problems with k7 mobile frequency is lower than real

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=8720

           Summary: still problems with k7 mobile frequency is lower than
                    real
           Product: Power Management
           Version: 2.5
     KernelVersion: 2.6.22-rc5
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: cpufreq
        AssignedTo: cpufreq@www.linux.org.uk
        ReportedBy: cimmo@libero.it
                CC: dsd@gentoo.org


Most recent kernel where this bug did not occur: don't know
Distribution: Kubuntu 7.04 and 7.10 Tribe2
Hardware Environment: Athlon XP-M 2400+
Problem Description: This cpu has 1800 Mhz and is detected well during early
startup but after by powernowdas 1473 Mhz, the last fix in bug #8255 didn't
solve the problem for me, before and after that patch is the same.

I tried also Kubuntu 7.10 Tribe 2 that has a 2.6.22rc5 custom according to
https://lists.ubuntu.com/archives/gutsy-changes/2007-June/003601.html

I personally verified that has the patch posted in bug #8255 and it has, but
same bug.

from dmesg attacched:
[    0.000000] Detected 1807.794 MHz processor.

[  118.852989] powernow: PowerNOW! Technology present. Can scale: frequency and
voltage.
[  118.862515] powernow: Trying ACPI perflib
[  118.864625] powernow: Minimum speed 1473 MHz. Maximum speed 1473 MHz.


The processor has the Barton core with 512 KB of cache


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[Bug 8720] still problems with k7 mobile frequency is lower than real

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------- Comment #1 from cimmo@libero.it  2007-07-06 10:24 -------
Created an attachment (id=11968)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=11968&action=view)
dmesg from kubuntu 7.10 tribe1

this was with a previous kernel I think 2.6.22rc3, but the bug is the same with
kubuntu 7.10 tribe2 that has 2.6.22rc5 and same is with kernel 2.6.20 from
kubuntu 7.04


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[Bug 8720] still problems with k7 mobile frequency is lower than real

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------- Comment #2 from cimmo@libero.it  2007-07-06 17:01 -------
Daniel if you put into a simple binary some debugging code I can run into the
notebook and report here result.

Probably the best thing to understand the problem.


thanx
Marco


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[Bug 8720] still problems with k7 mobile frequency is lower than real

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------- Comment #3 from cimmo@libero.it  2007-07-09 10:55 -------
seems all frequencies detected are the same one!

ale@portatile:~$ cat
/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
1472966 1472966 1472966 1472966 1472966 1472966


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[Bug 8720] still problems with k7 mobile frequency is lower than real

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------- Comment #4 from cimmo@libero.it  2007-07-22 17:13 -------
Created an attachment (id=12097)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=12097&action=view)
dmesg from kubuntu 7.10 tribe3 + XP-M 2800+

this the dmesg with the same identical notebook, kubuntu 7.10 tribe3 but
another Athlon XP Mobile, this time it's a 2800+ that should have 2,14 ghz
instead it's always recognized as: 1472-1473 Mhz

[    0.000000] Detected 2142.556 MHz processor.

[  239.598408] powernow: PowerNOW! Technology present. Can scale: frequency and
voltage.
[  239.653057] powernow: Trying ACPI perflib
[  239.669325] powernow: Minimum speed 1472 MHz. Maximum speed 1472 MHz.


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[Bug 8720] still problems with k7 mobile frequency is lower than real

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------- Comment #5 from cimmo@libero.it  2007-07-22 17:14 -------
Created an attachment (id=12098)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=12098&action=view)
scaling_available_frequencies from kubuntu 7.10 tribe3 + XP-M 2800+


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[Bug 8720] still problems with k7 mobile frequency is lower than real

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cimmo@libero.it changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      KernelVersion|2.6.22-rc5                  |2.6.22




------- Comment #6 from cimmo@libero.it  2007-07-28 07:45 -------
Tried a third cpu with the same notebook and this seems well recognized.

The cpu is an Athlon XP-M 2500+ at 1874 Mhz so probably there are still some
problems with cpu scaling frequencies calculation.


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[Bug 8720] still problems with k7 mobile frequency is lower than real

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------- Comment #7 from cimmo@libero.it  2007-07-28 07:48 -------
Created an attachment (id=12188)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=12188&action=view)
dmesg from kubuntu 7.10 tribe3 + XP-M 2500+

this cpu is correctly recognized by linux


[    0.000000] Detected 1874.742 MHz processor.

[  217.438431] powernow: PowerNOW! Technology present. Can scale: frequency and
voltage.
[  217.490428] powernow: SGTC: 13333
[  217.490431] powernow: Minimum speed 535 MHz. Maximum speed 1874 MHz.


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[Bug 8720] still problems with k7 mobile frequency is lower than real

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------- Comment #8 from cimmo@libero.it  2007-07-28 07:49 -------
Created an attachment (id=12189)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=12189&action=view)
scaling_available_frequencies from kubuntu 7.10 tribe3 + XP-M 2500+


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[Bug 8720] still problems with k7 mobile frequency is lower than real

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------- Comment #9 from dsd@gentoo.org  2007-07-29 19:55 -------
Please boot an affected system with the "cpufreq.debug=3" parameter and attach
full dmesg output here.


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------- Comment #10 from cimmo@libero.it  2007-07-30 11:27 -------
Daniel thanx so much for your answer.

There are other tests that I can do? Because the pc affected is not mine, so
when I go to my friend I do as many tests ad I can.

thanx


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------- Comment #11 from dsd@gentoo.org  2007-07-30 11:59 -------
Theres nothing I can do without that info, sorry. You may also wish to dump the
ACPI DSDT as detailed in the other bug as I suspect it will be needed later.

I think you also need to compile cpufreq debug support into your kernel for
that debug parameter to have an effect.


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------- Comment #12 from cimmo@libero.it  2007-07-30 15:52 -------
this can be a problem.
Is there a live cd with a debugging kernel that I can just launch? All that I
have is ubuntu tribe 3 for now.


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------- Comment #13 from cimmo@libero.it  2007-08-01 12:54 -------
well probably ubuntu 7.10 tribe3 is not built with debug level that I need
[    0.000000] Unknown boot option `cpufreq.debug=3': ignoring

but I have the ACPI dump that I obtained with acpidump utility, can be helpful?


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------- Comment #14 from cimmo@libero.it  2007-08-01 12:56 -------
Created an attachment (id=12229)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=12229&action=view)
acpidump with ubuntu 7.10 tribe3 and XP-M 2800+

obtained with:

sudo acpidump


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------- Comment #15 from cimmo@libero.it  2007-09-01 05:41 -------
Created an attachment (id=12658)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=12658&action=view)
dmesg with athlon xp-m 2400+ and kernel 2.6.22.5

this is a self-compiled 2.6.22.5 kernel with cpu freq debug support

dmesg attached and kernel started with cpufreq.debug=3 parameter under athlon-m
 2400+ where the bug occurs


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------- Comment #16 from cimmo@libero.it  2007-09-01 05:41 -------
Created an attachment (id=12659)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=12659&action=view)
acpidump with athlon xp-m 2400+ and kernel 2.6.22.5

this is a self-compiled 2.6.22.5 kernel with cpu freq debug support

acpidump attached and kernel started with cpufreq.debug=3 parameter under
athlon-m  2400+ where the bug occurs


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------- Comment #17 from cimmo@libero.it  2007-09-01 05:43 -------
Created an attachment (id=12660)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=12660&action=view)
dmesg with athlon xp-m 2500+ and kernel 2.6.22.5

this is a self-compiled 2.6.22.5 kernel with cpu freq debug support

dmesg attached and kernel started with cpufreq.debug=3 parameter under athlon-m
 2500+ where the bug DOESN'T occur


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------- Comment #18 from cimmo@libero.it  2007-09-01 05:46 -------
sorry for so many attachments, but I think last 3 files are what count.

SUMMARY with kernel 2.6.22.5:

Athlon XP-M 2400+ BUGGY
Athlon XP-M 2500+ NON BUGGY
Athlon XP-M 2800+ BUGGY


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dsd@gentoo.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #12659|application/octet-stream    |text/plain
          mime type|                            |




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dsd@gentoo.org changed:

           What    |Removed                     |Added
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                 CC|                            |davej@codemonkey.org.uk




------- Comment #19 from dsd@gentoo.org  2007-09-01 08:21 -------
Looking at dmesg in comment #15 and corresponding DSDT in comment #16:

powernow tables in this system are unusable so it falls back on ACPI. The
powernow_acpi_control_t values in the control field of the _PSS entries always
result in FID=0 VID=0 which looks wrong.

As there is _PCT, acpi-cpufreq may be a better cpufreq driver choice for this
system. However the ACPI-supplied cpu frequencies in _PSS are wrong.

The DSL code for _PSS reads FID and VID values from system memory (region FSEG
defined at 0x000FDF00 in system memory), and uses them as indexes into a local
PS13 array which presumably contains a series of frequencies. However, again
the FID values are always 0 so it always ends up looking at the first element,
0x5b7 (1463).

I'm not 100% sure if 0x000FDF00 is controlled by Linux or otherwise, however I
am fairly sure the answer here is that your BIOS is double-broken. Dave, any
comments?


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------- Comment #20 from cimmo@libero.it  2007-09-06 07:33 -------
So it's a bios bug?


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------- Comment #21 from dsd@gentoo.org  2007-09-06 07:46 -------
I'm not certain, but yes I think so.


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------- Comment #22 from cimmo@libero.it  2007-09-23 02:35 -------
Daniel only a question: isn't possible a small hack when you have this kind of
buggy bios then put the min and max frequency to the detected frequency that
seems ok?

For example comment #7:
[    0.000000] Detected 1874.742 MHz processor.


If not this bug can be closed I think.


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------- Comment #23 from dsd@gentoo.org  2007-09-23 04:19 -------
No, as we don't know what data to program into registers to ask the CPU to go
to that frequency.


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cimmo@libero.it changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |REJECTED
         Resolution|                            |INVALID




------- Comment #24 from cimmo@libero.it  2007-09-30 08:07 -------
Ok tried the same cpu in another motherboard and it's correctly recognized, so
I close this bug as "my bios is fucking buggy" :(

thanx Daniel for your time!


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