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ACPI and CPUFreq Utils Issues
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mezolithico
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PostPosted: Fri May 09, 2008 8:54 pm    Post subject: ACPI and CPUFreq Utils Issues Reply with quote
I'm having issues with cpu frequency scaling when I plug in my laptop. When my laptop is running on batteries, CPUFreq Utils will let me change the cpu governors. When it plug it in, the governor changes to performance, and won't let me change it. CPUFreq Utils will let me select another governor, but the cpu freq never changes. The default governor in the kernel is set to ondemand. I try to manually change the frequency but nothing seems to work.

uname -a:

Linux natasha 2.6.24-gentoo-r4 #2 SMP Wed May 7 03:07:05 PDT 2008 i686 AMD Turion(tm) 64 X2 Mobile Technology TL-50 AuthenticAMD GNU/Linux
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d2_racing
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PostPosted: Sat May 10, 2008 5:27 pm    Post subject: Reply with quote
Can you post your lspci plz ?
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mezolithico
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PostPosted: Mon May 12, 2008 3:50 pm    Post subject: Reply with quote
00:00.0 Host bridge: ATI Technologies Inc RS480 Host Bridge (rev 10)
00:01.0 PCI bridge: ATI Technologies Inc RS480 PCI Bridge
00:05.0 PCI bridge: ATI Technologies Inc RS480 PCI Bridge
00:06.0 PCI bridge: ATI Technologies Inc RS480 PCI Bridge
00:12.0 SATA controller: ATI Technologies Inc SB600 Non-Raid-5 SATA
00:13.0 USB Controller: ATI Technologies Inc SB600 USB (OHCI0)
00:13.1 USB Controller: ATI Technologies Inc SB600 USB (OHCI1)
00:13.2 USB Controller: ATI Technologies Inc SB600 USB (OHCI2)
00:13.3 USB Controller: ATI Technologies Inc SB600 USB (OHCI3)
00:13.4 USB Controller: ATI Technologies Inc SB600 USB (OHCI4)
00:13.5 USB Controller: ATI Technologies Inc SB600 USB Controller (EHCI)
00:14.0 SMBus: ATI Technologies Inc SB600 SMBus (rev 13)
00:14.1 IDE interface: ATI Technologies Inc SB600 IDE
00:14.2 Audio device: ATI Technologies Inc SB600 Azalia
00:14.3 ISA bridge: ATI Technologies Inc SB600 PCI to LPC Bridge
00:14.4 PCI bridge: ATI Technologies Inc SB600 PCI to PCI Bridge
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control
01:05.0 VGA compatible controller: ATI Technologies Inc RS485 [Radeon Xpress 1100 IGP]
05:00.0 Network controller: Broadcom Corporation BCM94311MCG wlan mini-PCI (rev 01)
08:00.0 Ethernet controller: Broadcom Corporation BCM4401-B0 100Base-TX (rev 02)
08:01.0 Generic system peripheral [0805]: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 19)
08:01.1 System peripheral: Ricoh Co Ltd Unknown device 0843 (rev 01)
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Earthwings
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PostPosted: Mon May 12, 2008 4:51 pm    Post subject: Reply with quote
Please post the output of
Code:
LC_ALL=C cpufreq-info
once when running on AC and once on batteries.
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mezolithico
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PostPosted: Mon May 12, 2008 8:16 pm    Post subject: Reply with quote
On batteries:

cpufrequtils 002: cpufreq-info (C) Dominik Brodowski 2004-2006
Report errors and bugs to linux@brodo.de, please.
analyzing CPU 0:
driver: powernow-k8
CPUs which need to switch frequency at the same time: 0 1
hardware limits: 800 MHz - 1.60 GHz
available frequency steps: 1.60 GHz, 800 MHz
available cpufreq governors: conservative, userspace, powersave, ondemand, performance
current policy: frequency should be within 800 MHz and 1.60 GHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 800 MHz.
analyzing CPU 1:
driver: powernow-k8
CPUs which need to switch frequency at the same time: 0 1
hardware limits: 800 MHz - 1.60 GHz
available frequency steps: 1.60 GHz, 800 MHz
available cpufreq governors: conservative, userspace, powersave, ondemand, performance
current policy: frequency should be within 800 MHz and 1.60 GHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 800 MHz.


On AC:

cpufrequtils 002: cpufreq-info (C) Dominik Brodowski 2004-2006
Report errors and bugs to linux@brodo.de, please.
analyzing CPU 0:
driver: powernow-k8
CPUs which need to switch frequency at the same time: 0 1
hardware limits: 800 MHz - 1.60 GHz
available frequency steps: 1.60 GHz, 800 MHz
available cpufreq governors: conservative, userspace, powersave, ondemand, performance
current policy: frequency should be within 1.60 GHz and 1.60 GHz.
The governor "powersave" may decide which speed to use
within this range.
current CPU frequency is 1.60 GHz.
analyzing CPU 1:
driver: powernow-k8
CPUs which need to switch frequency at the same time: 0 1
hardware limits: 800 MHz - 1.60 GHz
available frequency steps: 1.60 GHz, 800 MHz
available cpufreq governors: conservative, userspace, powersave, ondemand, performance
current policy: frequency should be within 1.60 GHz and 1.60 GHz.
The governor "powersave" may decide which speed to use
within this range.
current CPU frequency is 1.60 GHz.
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Earthwings
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PostPosted: Mon May 12, 2008 8:56 pm    Post subject: Reply with quote
What happens if you try to lower the minimum frequency in AC mode?
Code:
cpufreq-set -d 800MHz

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mezolithico
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PostPosted: Thu May 15, 2008 10:13 am    Post subject: Reply with quote
I run:
Code:
cpufreq-set -d 800MHz

but it doesn't change anything.
I was able to run
Code:
cpufreq-set -u 800MHz

and that actually brought the frequency down. I could then set the governors. I set it to ondemand, and when it got the demand it bumped the governor back up to performance and gets stuck there again.
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Cheesebaron
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PostPosted: Thu May 15, 2008 11:54 am    Post subject: Reply with quote
I think you should try to reproduce the problem with other kernel versions to see if it persists.
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