linux-kernel - Re: 2.6.17 -> 2.6.18 regression: cpufreq broken since 2.6.18-rc1 on pentium4

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Date:	Sun, 30 Jul 2006 20:44:43 +0200
From:	bert hubert <bert.hubert@...herlabs.nl>
To:	Alexey Starikovskiy <alexey_y_starikovskiy@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, zwane@....linux.org.uk,
	davej@...hat.com, venkatesh.pallipadi@...el.com, tony@...mide.com,
	akpm@...l.org, cpufreq@...ts.linux.org.uk
Subject: Re: 2.6.17 -> 2.6.18 regression: cpufreq broken since 2.6.18-rc1 on	pentium4

On Sun, Jul 30, 2006 at 10:07:18PM +0400, Alexey Starikovskiy wrote:
> Do I understand your logs right and acpi-cpufreq is already loaded and 
> works on your processor?

Yes, I can load it, but I'm unable to figure out what it is supposed to do,
or if it is doing anything.

> Do you have any info in /sys/devices/system/cpu/cpu0/cpufreq ?

No, not with just acpi-cpufreq loaded. With the help of Zwane, I've
discovered that if I unload acpi-cpufreq, I *can* load p4-clockmod, and then
the directory you mention appears, and I can configure governors, and life
is good. This all on 2.6.18-rc3.

Do I understand correctly that acpi-cpufreq is supposed to offer comparable
features?

Perhaps acpi-cpufreq *has* loaded, but did not find the proper hooks, but
has now registered itself, thus blocking p4-clockmod? When everything is
in-kernel, acpi-cpufreq might register itself first, which would lead to the
same thing.

For completeness, lspci. This is a desktop system, but I need some kind of
governer for quiet running.

$ lspci
0000:00:00.0 Host bridge: Intel Corporation 915G/P/GV/GL/PL/910GL Processor to I/O Controller (rev 04)
0000:00:01.0 PCI bridge: Intel Corporation 915G/P/GV/GL/PL/910GL PCI Express Root Port (rev 04)
0000:00:02.0 VGA compatible controller: Intel Corporation 82915G/GV/910GL Express Chipset Family Graphics Controller (rev 04)
0000:00:1b.0 0403: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) High Definition Audio Controller (rev 03)
0000:00:1c.0 PCI bridge: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) PCI Express Port 1 (rev 03)
0000:00:1c.1 PCI bridge: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) PCI Express Port 2 (rev 03)
0000:00:1c.2 PCI bridge: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) PCI Express Port 3 (rev 03)
0000:00:1c.3 PCI bridge: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) PCI Express Port 4 (rev 03)
0000:00:1d.0 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #1 (rev 03)
0000:00:1d.1 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #2 (rev 03)
0000:00:1d.2 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #3 (rev 03)
0000:00:1d.3 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #4 (rev 03)
0000:00:1d.7 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB2 EHCI Controller (rev 03)
0000:00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev d3)
0000:00:1f.0 ISA bridge: Intel Corporation 82801FB/FR (ICH6/ICH6R) LPC Interface Bridge (rev 03)
0000:00:1f.1 IDE interface: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) IDE Controller (rev 03)
0000:00:1f.2 IDE interface: Intel Corporation 82801FB/FW (ICH6/ICH6W) SATA Controller (rev 03)0000:00:1f.3 SMBus: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) SMBus Controller (rev 03)
0000:06:00.0 Network controller: Techsan Electronics Co Ltd B2C2 FlexCopII DVB chip / Technisat SkyStar2 DVB card (rev 02)
0000:06:08.0 Ethernet controller: Intel Corporation 82562ET/EZ/GT/GZ - PRO/100 VE (LOM) Ethernet Controller (rev 01)

Thanks!

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