linux-kernel - 2.6.28 - 2.6.29-rc6-git5 regression, p4-clockmod/cpufreq probably

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Date:	Mon, 2 Mar 2009 17:04:59 +0200
From:	Denys Fedoryschenko <denys@...p.net.lb>
To:	linux-kernel@...r.kernel.org, "Rafael J. Wysocki" <rjw@...k.pl>,
	cpufreq@...r.kernel.org, davej@...hat.com
Subject: 2.6.28 - 2.6.29-rc6-git5 regression, p4-clockmod/cpufreq probably

Please CC me, i am not on linux-kernel maillist

Hardware: Asus EEE 702, 
CPU: Intel Celeron 900 Mhz

On 2.6.28 p4-clockmod available, and i can manage governor, frequency and etc 
over cpufrequtils.
On 2.6.29-rc6 (git5 tested also) also shown in dmesg as available, but i  
can't change anything.

root # cpufreq-info
cpufrequtils 002: cpufreq-info (C) Dominik Brodowski 2004-2006
Report errors and bugs to linux@...do.de, please.
analyzing CPU 0:
  no or unknown cpufreq driver is active on this CPU

There is no noticeable differences in dmesg.
Both have
[    2.438474] p4-clockmod: P4/Xeon(TM) CPU On-Demand Clock Modulation 
available


Here is end of strace on cpufreq-info
lstat64("/sys/devices/system/cpu/cpu0/", {st_mode=S_IFDIR|0755, 
st_size=0, ...}) = 0
lstat64("/sys/devices/system/cpu/cpu0/", {st_mode=S_IFDIR|0755, 
st_size=0, ...}) = 0
write(1, "analyzing CPU 0:\n"..., 17analyzing CPU 0:
)   = 17
stat64("/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq", 0xbfbce570) 
= -1 ENOENT (No such file or directory)
open("/proc/sys/cpu/0/speed", O_RDONLY) = -1 ENOENT (No such file or 
directory)
stat64("/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq", 0xbfbce570) 
= -1 ENOENT (No such file or directory)
stat64("/sys/devices/system/cpu/cpu0/cpufreq/scaling_driver", 0xbfbce580) = -1 
ENOENT (No such file or directory)
write(1, "  no or unknown cpufreq driver is"..., 53  no or unknown cpufreq 
driver is active on this CPU
) = 53
stat64("/sys/devices/system/cpu/cpu0/cpufreq/affected_cpus", 0xbfbce460) = -1 
ENOENT (No such file or directory)
stat64("/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq", 0xbfbce560) 
= -1 ENOENT (No such file or directory)
stat64("/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies", 
0xbfbce460) = -1 ENOENT (No such file or directory)
stat64("/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors", 
0xbfbce560) = -1 ENOENT (No such file or directory)
stat64("/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor", 0xbfbce570) 
= -1 ENOENT (No such file or directory)

If you need more information, let me know.
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