powernow-k7 doesn't appear to work with linux-image-2.6.15-7-k7

[Michael Robinson]

When restarting powernowd, I get the following:

 * Stopping powernowd:
   ...done.
FATAL: Error inserting powernow_k7
(/lib/modules/2.6.15-7-k7/kernel/arch/i386/kernel/cpu/cpufreq/powernow-k7.ko):
No such device
FATAL: Error inserting acpi_cpufreq
(/lib/modules/2.6.15-7-k7/kernel/arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.ko):
No such device
 * Starting powernowd...
 * CPU frequency scaling not supported
   ...done.

My system is a Compaq Evo n115, with a AMD K6-2 (from dmidecode; also detected
by the kernel as "AMD mobile AMD Athlon(tm) 4 Processor stepping 02"). Under
2.6.12-9-k7, things worked fine, and I got CPU scaling happening. Now, no show.

Irritatingly, I also get the following in dmesg:

powernow: PowerNOW! Technology present. Can scale: frequency and voltage.

cpufreq_powersave probes OK. As does pcc_acpi.

[Patrick McFarland (diablod3)]

This is also happening on my laptop. I confirmed that powernow-k7 properly loads
on 2.6.12-9-k7. yet not on any 2.6.15.

[Ben Collins (ben-collins)]

Can you send dmesg output please?

[Ben Collins (ben-collins)]

*** Bug 26669 has been marked as a duplicate of this bug. ***

[Ben Collins (ben-collins)]

Send me the output of /proc/cpu please. I think you should be using powernow-k6.

[Michael Robinson (michael-livia)]

Created an attachment (id=5329)
Dmesg output from Evo n115 laptop

Afraid it's not that informative. /proc/cpuinfo reports:

processor : 0
vendor_id : AuthenticAMD
cpu family : 6
model : 6
model name : mobile AMD Athlon(tm) 4 Processor
stepping : 2
cpu MHz : 1195.990
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat
pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow
bogomips : 2394.49

When I try powernow-k6, I get the following:

michaelrlt$ sudo modprobe powernow-k6
FATAL: Error inserting powernow_k6
(/lib/modules/2.6.15-7-k7/kernel/arch/i386/kernel/cpu/cpufreq/powernow-k6.ko):
No such device
michaelrlt$ sudo modprobe powernow-k7
FATAL: Error inserting powernow_k7
(/lib/modules/2.6.15-7-k7/kernel/arch/i386/kernel/cpu/cpufreq/powernow-k7.ko):
No such device

I also get a repeat of the message:

[17259392.920000] powernow: PowerNOW! Technology present. Can scale: frequency
and voltage.

when I probe powernow-k7, but not for powernow-k6.

[Ben Collins (ben-collins)]

> when I probe powernow-k7, but not for powernow-k6.

Based on this, it looks like the powernow-k7 driver succeeds, but it's the
cpufreq driver that is causing the failure.

Please do this:

lsmod | grep cpufreq

rmmod all of the modules listed, including powernow-k7

Then do:

modprobe cpufreq debug=3
modprobe powernow-k7

And attach the full dmesg output

Thanks

[Michael Robinson (michael-livia)]

Sorry, cpufreq appears to be compiled in.

michaelrlt$ grep 'vmlinux.*cpufreq' /boot/abi-2.6.15-7-k7
vmlinux __cpufreq_driver_target 0x58dee4ae
vmlinux cpufreq_cpu_get 0xe1eef8a2
vmlinux cpufreq_cpu_put 0x025478da
vmlinux cpufreq_driver_target 0xbaa86595
vmlinux cpufreq_get 0x9305f8e6
vmlinux cpufreq_get_policy 0x12201723
vmlinux cpufreq_gov_performance 0x056fe76a
vmlinux cpufreq_governor 0xc2018172
vmlinux cpufreq_notify_transition 0xe6488b47
vmlinux cpufreq_parse_governor 0x7942705e
vmlinux cpufreq_register_driver 0x7bcb44d3
vmlinux cpufreq_register_governor 0x149a0780
vmlinux cpufreq_register_notifier 0xadaa2657
vmlinux cpufreq_set_policy 0xba76b2be
vmlinux cpufreq_unregister_driver 0xea49dd0f
vmlinux cpufreq_unregister_governor 0xecb7c5a4
vmlinux cpufreq_unregister_notifier 0x3b3016d3
vmlinux cpufreq_update_policy 0x8664f62e

michaelrlt$ lsmod | grep cpufreq
cpufreq_stats 6912 0
cpufreq_powersave 2240 0
cpufreq_ondemand 8104 0
cpufreq_conservative 9256 0
cpufreq_userspace 6816 0
freq_table 5152 1 cpufreq_stats

michaelrlt$ sudo modprobe cpufreq debug=3
FATAL: Module cpufreq not found.
michaelrlt$ sudo modprobe powernow-k7
FATAL: Error inserting powernow_k7
(/lib/modules/2.6.15-7-k7/kernel/arch/i386/kernel/cpu/cpufreq/powernow-k7.ko):
No such device

Only output in dmesg is:

[17267051.648000] powernow: PowerNOW! Technology present. Can scale: frequency
and voltage.

(Obviously enough!)

Is there any way to change the debug parameter for the compiled in module?

[Ben Collins (ben-collins)]

(In reply to comment #7)
> Sorry, cpufreq appears to be compiled in.

Ah, right. Try booting the kernel with cpufreq_debug=3

[Michael Robinson (michael-livia)]

Hmmm. Doesn't seem to change anything, probably because:

michaelrlt$ grep CPU_FREQ.*DEBUG /boot/config-2.6.15-7-k7
# CONFIG_CPU_FREQ_DEBUG is not set

Ooops.

Roll me own kernel time, I suppose. I'll try -8-k7 first, which I notice has
just become available; then I guess it's download kernel-package, and
linux-source-2.6.15 and reuse the config with the DEBUG flag on this time?

[David Schleef (dschleef)]

See also:

http://www.ubuntuforums.org/showthread.php?t=105696

Also happens with -9-k7.

[Ben Collins (ben-collins)]

(In reply to comment #10)
> See also:
>
> http://www.ubuntuforums.org/showthread.php?t=105696
>
> Also happens with -9-k7.

Interesting. It seems that p4, k8 and a couple of others have some sort of SMP
support in them. I'm very surprised that k7 doesn't work when there's only one
CPU available. The powernow-k7 driver is built, so I would expect it to work,
even if only limited.

[Ben Collins (ben-collins)]

Thanks for the pointer. Given that information, I was able to easily modify
powernow-k7 driver to work on UP systems, even in the SMP kernel.

[Ben Collins (ben-collins)]

Fix as of atleast 2.6.15-11.16

[Snark (julien-puydt)]

I'm not convinced it is fixed : I still had the error message about cpu scaling
not being supported when logging in.

Here is some data, if that helps :

$ uname -a
Linux hilbert 2.6.15-11-k7 #1 SMP PREEMPT Wed Jan 4 07:38:50 UTC 2006 i686 GNU/Linux

$ cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 6
model : 10
model name : mobile AMD Athlon(tm) XP-M 2800+
stepping : 0
cpu MHz : 2133.353
cache size : 512 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat
pse36 mmx fxsr sse syscall mp mmxext 3dnowext 3dnow
bogomips : 4268.43

# modprobe powernow-k6
FATAL: Error inserting powernow_k6
(/lib/modules/2.6.15-11-k7/kernel/arch/i386/kernel/cpu/cpufreq/powernow-k6.ko):
No such device

# modprobe powernow-k7
FATAL: Error inserting powernow_k7
(/lib/modules/2.6.15-11-k7/kernel/arch/i386/kernel/cpu/cpufreq/powernow-k7.ko):
No such device

# modprobe powernow-k8
FATAL: Error inserting powernow_k8
(/lib/modules/2.6.15-11-k7/kernel/arch/i386/kernel/cpu/cpufreq/powernow-k8.ko):
No such device

The following can probably be helpful :

$ dmesg | grep owern
[4295258.432000] powernow-k8: Processor cpuid 6a0 not supported

Can I do more ?

[David Schleef (dschleef)]

Yup, not working here either.

[MuratE (murate)]

It is not working for me either.
root@Dexxx~# modprobe -v powernow-k8
insmod /lib/modules/2.6.15-11-k7/kernel/arch/i386/kernel/cpu/cpufreq/powernow-k8.ko
FATAL: Error inserting powernow_k8
(/lib/modules/2.6.15-11-k7/kernel/arch/i386/kernel/cpu/cpufreq/powernow-k8.ko):
No such device
root@Dexxx:~# modprobe -v powernow-k7
insmod /lib/modules/2.6.15-11-k7/kernel/arch/i386/kernel/cpu/cpufreq/powernow-k7.ko
FATAL: Error inserting powernow_k7
(/lib/modules/2.6.15-11-k7/kernel/arch/i386/kernel/cpu/cpufreq/powernow-k7.ko):
No such device
root@Dexxx:~# modprobe -v powernow-k6
insmod /lib/modules/2.6.15-11-k7/kernel/arch/i386/kernel/cpu/cpufreq/powernow-k6.ko
FATAL: Error inserting powernow_k6
(/lib/modules/2.6.15-11-k7/kernel/arch/i386/kernel/cpu/cpufreq/powernow-k6.ko):
No such device

output of /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 6
model : 8
model name : mobile AMD Athlon(tm) XP2000+
stepping : 1
cpu MHz : 1656.402
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat
pse36 mmx fxsr sse syscall mp mmxext 3dnowext 3dnow
bogomips : 3313.94

[David Schleef (dschleef)]

This section of code is where the modprobe is failing on my system:

        /* Does not support multi-cpu systems */
        if (num_online_cpus() != 1 || num_possible_cpus() != 1)
                return -ENODEV;

Since I clearly only have one (online) CPU, I'm assuming that
num_possible_cpus() is not 1. (Or, the macros don't evaluate to a simple
expression.)

[Ben Collins (ben-collins)]

(In reply to comment #17)
> This section of code is where the modprobe is failing on my system:
>
> /* Does not support multi-cpu systems */
> if (num_online_cpus() != 1 || num_possible_cpus() != 1)
> return -ENODEV;
>
> Since I clearly only have one (online) CPU, I'm assuming that
> num_possible_cpus() is not 1. (Or, the macros don't evaluate to a simple
> expression.)

Are you able to compile modules? If so can you compile powernow-k7.ko with the
above section of code commented out?

[David Schleef (dschleef)]

It's the 'num_possible_cpus() != 1' that fails in that line, which seems rather odd since this is a laptop with (you guessed it) exactly 1 CPU.

Anyway, recompiled without this line, and it now fails in drivers/cpufreq/cpufreq.c around line 1500:

                /* check for at least one working CPU */
                for (i=0; i<NR_CPUS; i++)
                        if (cpufreq_cpu_data[i])
                                ret = 0;

None of the cpufreq_cpu_data[] array elements are set. It's unclear to me as to why. I'm trying to enable CONFIG_CPU_FREQ_DEBUG=y in the .config, but the package build system is a bit opaque in this process.

[Martin Ammermüller (martin-ammermueller)]

I can confirm this bug with 6.04 development branch of today. I am using the package linux-image-2.6.15-12-k7. The contents of /proc/cpuinfo:

processor : 0
vendor_id : AuthenticAMD
cpu family : 6
model : 8
model name : mobile AMD Athlon(tm) XP-M 2000+
stepping : 1
cpu MHz : 1659.002
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 mmx fxsr sse syscall mp mmxext 3dnowext 3dnow
bogomips : 3319.31

The error message is:

FATAL: Error inserting powernow_k7 (/lib/modules/2.6.15-12-k7/kernel/arch/i386/kernel/cpu/cpufreq/powernow-k7.ko): No such device

HTH

[Martin Ammermüller (martin-ammermueller)]

sorry, forgot to add this one:

martin@lotophag:~$ dmesg |grep powernow
[4314772.537000] powernow-k8: Processor cpuid 681 not supported

The strange thing is: with kernel version 2.6.12 and breezy, powernow-k7 is loaded (and works).

[Patrick McFarland (diablod3)]

kernel-image-2.6.15-12-386 loads powernow-k7 fine

[Ben Collins (ben-collins)]

Please send this:

ls -lR /sys/devices/system/cpu/cpu0

[Snark (julien-puydt)]

jpuydt@hilbert:~$ ls -lR /sys/devices/system/cpu/cpu0
/sys/devices/system/cpu/cpu0:
total 0
-rw------- 1 root root 4096 2006-01-20 07:37 online

(still with : jpuydt@hilbert:~$ uname -a
Linux hilbert 2.6.15-12-k7 #1 SMP PREEMPT Fri Jan 13 07:10:00 UTC 2006 i686 GNU/Linux)

[Patrick McFarland (diablod3)]

And on my -386 kernel running system.....
[diablo@absolute ~]$ ls -lR /sys/devices/system/cpu/cpu0
/sys/devices/system/cpu/cpu0:
total 0
drwxr-xr-x 3 root root 0 2006-01-22 18:13 cpufreq

/sys/devices/system/cpu/cpu0/cpufreq:
total 0
-r--r--r-- 1 root root 4096 2006-01-22 18:13 affected_cpus
-r-------- 1 root root 4096 2006-01-22 18:13 cpuinfo_cur_freq
-r--r--r-- 1 root root 4096 2006-01-22 18:13 cpuinfo_max_freq
-r--r--r-- 1 root root 4096 2006-01-22 18:13 cpuinfo_min_freq
-r--r--r-- 1 root root 4096 2006-01-22 18:13 scaling_available_frequencies
-r--r--r-- 1 root root 4096 2006-01-22 18:13 scaling_available_governors
-r--r--r-- 1 root root 4096 2006-01-22 18:13 scaling_cur_freq
-r--r--r-- 1 root root 4096 2006-01-22 18:13 scaling_driver
-rw-r--r-- 1 root root 4096 2006-01-22 17:55 scaling_governor
-rw-r--r-- 1 root root 4096 2006-01-22 18:13 scaling_max_freq
-rw-r--r-- 1 root root 4096 2006-01-22 18:13 scaling_min_freq
drwxr-xr-x 2 root root 0 2006-01-22 17:54 stats

/sys/devices/system/cpu/cpu0/cpufreq/stats:
total 0
-r--r--r-- 1 root root 4096 2006-01-22 18:13 time_in_state
-r--r--r-- 1 root root 4096 2006-01-22 18:13 total_trans
-r--r--r-- 1 root root 4096 2006-01-22 18:13 trans_table

[diablo@absolute ~]$ uname -a
Linux absolute 2.6.15-13-386 #1 PREEMPT Thu Jan 19 16:24:40 UTC 2006 i686 GNU/Linux

[Patrick McFarland (diablod3)]

Er, apparently I fail at formatting. Doh.

[Guillermo Gutiérrez (capitanterrex)]

Recompiling the 2.6.15-k7 kernel manually using make-kpkg and provided dapper .config but unmarking SMP support solved this problem for me. [HP Pavilion ze4334EA, AMD Athlon xp 2200+ (1.8GHz)]

Please do not compile future non-smp kernels with smp support.

[Ben Collins (ben-collins)]

Everyone reporting "works with non-smp" can just stop. I already know this.

And -k7 is an SMP kernel. It's meant to be multi-purpose, since it has code that disables SMP functionality (locking, etc) at boot.

However, powernow-k7 is the only cpu frequency driver that doesn't work when compiled for SMP. All the other cpu frequency scaling drivers work fine.

So the thing that I am working on is to make powernow-k7 work with SMP. Disabling SMP is not an option.

[Francis Provencher (francis-tzone)]

A patch was submitted to the kernel mailing list for this problem:
http://seclists.org/lists/linux-kernel/2006/Jan/1180.html

It is also included in Andrew Morton's version:
http://lwn.net/Articles/166495/

[Ben Collins (ben-collins)]

On Mon, 2006-01-30 at 11:26 +0000, Francis Provencher wrote:
> A patch was submitted to the kernel mailing list for this problem:
> http://seclists.org/lists/linux-kernel/2006/Jan/1180.html
>
> It is also included in Andrew Morton's version:
> http://lwn.net/Articles/166495/

You should pay more attention to things :) That's my patch. The one that
isn't working. The real fix is in my tree now.

--
Ben Collins
Kernel Developer - Ubuntu Linux

[Martin Ammermüller (martin-ammermueller)]

With kernel-package version 2.6.15-15-k7 scaling the frequency is working now. But AFAICS only /sys/devices/system/cpu/cpu0/cpufreq/ gets updated properly, but not /proc/cpuinfo:
------
$ sudo cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq
663600
$ cat /proc/cpuinfo |grep MHz
cpu MHz : 1659.002
-----------

What's strange, too: the frequency as reported in /proc/cpuinfo is now 3.998 Hz lower :-)