[Bug 8033] New: CPU loses cpufreq link after offline/online transition

[Bug 8033] New: CPU loses cpufreq link after offline/online transition

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=8033

           Summary: CPU loses cpufreq link after offline/online transition
    Kernel Version: 2.6.20
            Status: NEW
          Severity: normal
             Owner: cpufreq@www.linux.org.uk
         Submitter: bernhard.bender@web.de


Most recent kernel where this bug did *NOT* occur: unknown
Distribution: openSuSE10.2 (probably irrelevant)
A previous descussion of this problem is here:
https://bugzilla.novell.com/show_bug.cgi?id=246525

Hardware Environment: hp compaq nx6325 (AMD Turion64 X2
Software Environment:

Problem Description:
After taking CPU1 offline and online again, the
/sys/devices/system/cpu/cpu1/cpufreq link is missing.
This also happens after suspend2disk and resume.

While the CPU will work normally, kpowersave will report it as disabled.

Steps to reproduce:
as root user:
# echo 0 >/sys/devices/system/cpu/cpu1/online
# echo 1 >/sys/devices/system/cpu/cpu1/online
# l /sys/devices/system/cpu/*
-rw-r--r-- 1 root root 4096 2007-02-16 23:12
/sys/devices/system/cpu/sched_mc_power_savings

/sys/devices/system/cpu/cpu0:
total 0
drwxr-xr-x 5 root root    0 2007-02-16 23:12 ./
drwxr-xr-x 4 root root    0 2007-02-16 23:12 ../
drwxr-xr-x 5 root root    0 2007-02-17 00:08 cache/
drwxr-xr-x 3 root root    0 2007-02-16 23:12 cpufreq/
-r-------- 1 root root 4096 2007-02-16 23:12 crash_notes
drwxr-xr-x 2 root root    0 2007-02-17 00:08 topology/

/sys/devices/system/cpu/cpu1:
total 0
drwxr-xr-x 4 root root    0 2007-02-16 23:13 ./
drwxr-xr-x 4 root root    0 2007-02-16 23:12 ../
drwxr-xr-x 5 root root    0 2007-02-16 23:13 cache/
-r-------- 1 root root 4096 2007-02-16 23:12 crash_notes
-rw------- 1 root root    0 2007-02-16 23:13 online
drwxr-xr-x 2 root root    0 2007-02-16 23:13 topology/
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