apport information
** Tags added: apport-collected oneiric
** Description changed:
Summary:
Ubuntu 10.04 hangs when the CPU scaling governor is set to "ondemand",
"conservative", or "userspace" at 1000 MHz and 900 MHz. Other freqs don't hang.
Motherboard: Jetway NF77-N1G6-LF
CPU: VIA Nano processor L2200@1600MHz
Ubuntu installer: Ubuntu 10.04.1 64-bit alternate
Test setup:
- Install Ubuntu 10.04.1 64-bit from an alternate CD or an alternate USB
stick.
- As soon as you reach the login screen, quickly press CTRL+ALT+F6 to go to a
terminal, then quickly type "sudo chmod -x /etc/init.d/ondemand". The quickly
type "sudo reboot" to reboot the computer. This will disable the ondemand
script from changing the cpu governor on the next boot.
- On the next boot, log in normally, then update all packages from the Update
Manager, and reboot if necessary.
- Launch a Terminal window. All test cmds will be executed from this
directory:
$ cd /sys/devices/system/cpu/cpu0/cpufreq
- Open a 2nd Terminal window and execute this so you can watch the CPU freq.
$ watch -n0 "cat /proc/cpuinfo"
Test:
- Check the available and current governor, the available freqs, and the
scaling driver.
$ cat scaling_available_governors
conservative ondemand userspace powersave performance
$ cat scaling_governor
performance
$ cat scaling_available_frequencies
1600000 1400000 1300000 1200000 1100000 1000000 900000 800000
$ cat scaling_driver
acpi-cpufreq
- Try powersave. The CPU drops to 800 MHz. No hang.
$ echo -n powersave | sudo tee scaling_governor
- Try ondemand. Ubuntu hangs after I press enter.
$ echo -n ondemand | sudo tee scaling_governor
- Reboot, then try conservative. Ubuntu hangs a moment after I press enter. I
observed the CPU freq dropping to 1400 MHz, then 1300 MHz, 1200 MHz, 1100 MHz,
then hang.
$ echo -n conservative | sudo tee scaling_governor
- Reboot, then try userspace. No hang at this point. CPU freq is 1600 MHz.
$ echo -n userspace | sudo tee scaling_governor
- Manually change the CPU freq. These changes don't hang. The CPU freq is
correctly changed to the specified freq.
$ echo -n 1400000 | sudo tee scaling_setspeed
$ echo -n 1300000 | sudo tee scaling_setspeed
$ echo -n 1200000 | sudo tee scaling_setspeed
$ echo -n 1100000 | sudo tee scaling_setspeed
- Now try 1000 MHz. This hangs instantly.
$ echo -n 1000000 | sudo tee scaling_setspeed
- Reboot, try 900 MHz. This hangs instantly.
$ echo -n 900000 | sudo tee scaling_setspeed
- Reboot, try 800 MHz. CPU freq changed to 800 Mhz. No hang.
$ echo -n 800000 | sudo tee scaling_setspeed
END OF TEST
Other notes:
- Some other info about my installation.
$ uname -srvmpio
Linux 2.6.32-32-generic #62-Ubuntu SMP Wed Apr 20 21:52:38 UTC 2011 x86_64
unknown unknown GNU/Linux
$ lsb_release -rd
Description: Ubuntu 10.04.2 LTS
Release: 10.04
$ apt-cache policy linux-image-generic
linux-image-generic:
Installed: 2.6.32.32.38
Candidate: 2.6.32.32.38
Version table:
*** 2.6.32.32.38 0
500 http://us.archive.ubuntu.com/ubuntu/ lucid-updates/main Packages
500 http://security.ubuntu.com/ubuntu/ lucid-security/main Packages
100 /var/lib/dpkg/status
2.6.32.21.22 0
500 http://us.archive.ubuntu.com/ubuntu/ lucid/main Packages
- If the CPU is already at 800 MHz, "ondemand" sometimes doesn't hang
instantly. My guess is that the hang occurs when a process in the
background pushes the CPU to 1600 MHz, then ondemand hangs when it tries
to quickly scale the CPU freq back down to 800 MHz.
- - I have a different motherboard that also has a VIA Nano L2200 CPU. The
- board is a VIA VB8001. There is no problem with ondemand on that board
- because "/sys/devices/system/cpu/cpu0/cpufreq" doesn't even exist. I
- have no idea why.
+ - I have a different motherboard that also has a VIA Nano L2200 CPU. The
board is a VIA VB8001. There is no problem with ondemand on that board because
"/sys/devices/system/cpu/cpu0/cpufreq" doesn't even exist. I have no idea why.
+ ---
+ AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
+ ApportVersion: 1.23-0ubuntu4
+ Architecture: amd64
+ ArecordDevices:
+ **** List of CAPTURE Hardware Devices ****
+ card 0: VT82xx [HDA VIA VT82xx], device 0: VT1708B Analog [VT1708B Analog]
+ Subdevices: 2/2
+ Subdevice #0: subdevice #0
+ Subdevice #1: subdevice #1
+ AudioDevicesInUse:
+ USER PID ACCESS COMMAND
+ /dev/snd/controlC0: lee 1434 F.... xfce4-volumed
+ lee 1440 F.... pulseaudio
+ CRDA: Error: [Errno 2] No such file or directory
+ Card0.Amixer.info:
+ Card hw:0 'VT82xx'/'HDA VIA VT82xx at 0xdfff8000 irq 68'
+ Mixer name : 'VIA VT1708B 8-Ch'
+ Components : 'HDA:1106e721,16f307f5,00100100'
+ Controls : 27
+ Simple ctrls : 15
+ DistroRelease: Ubuntu 11.10
+ HibernationDevice: RESUME=UUID=af61867e-a9e1-4201-94ca-bcb9d713183a
+ InstallationMedia: Xubuntu 11.04 "Natty Narwhal" - Release amd64 (20110426.1)
+ IwConfig:
+ lo no wireless extensions.
+
+ eth0 no wireless extensions.
+ Lsusb:
+ Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+ Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
+ Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
+ Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
+ Bus 003 Device 002: ID 045e:0095 Microsoft Corp. IntelliMouse Explorer 4.0
(IntelliPoint)
+ MachineType: VIA Technologies Ltd. VX800
+ Package: linux (not installed)
+ ProcEnviron:
+ PATH=(custom, no user)
+ LANG=en_US.UTF-8
+ SHELL=/bin/bash
+ ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-17-generic
root=UUID=5b5aaf54-85cf-4eb6-848c-8745288f5ce7 ro quiet splash vt.handoff=7
+ ProcVersionSignature: Ubuntu 3.0.0-17.30-generic 3.0.22
+ RelatedPackageVersions:
+ linux-restricted-modules-3.0.0-17-generic N/A
+ linux-backports-modules-3.0.0-17-generic N/A
+ linux-firmware 1.60
+ RfKill:
+
+ Tags: oneiric
+ Uname: Linux 3.0.0-17-generic x86_64
+ UpgradeStatus: Upgraded to oneiric on 2012-04-01 (0 days ago)
+ UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
+ dmi.bios.date: 12/03/2008
+ dmi.bios.vendor: Phoenix Technologies, LTD
+ dmi.bios.version: 6.00 PG
+ dmi.board.name: VX800
+ dmi.board.vendor: VIA Technologies Ltd.
+ dmi.board.version: 1.0
+ dmi.chassis.type: 3
+ dmi.chassis.vendor: VIA Technologies Ltd.
+ dmi.chassis.version: VX800
+ dmi.modalias:
dmi:bvnPhoenixTechnologies,LTD:bvr6.00PG:bd12/03/2008:svnVIATechnologiesLtd.:pnVX800:pvr1.0:rvnVIATechnologiesLtd.:rnVX800:rvr1.0:cvnVIATechnologiesLtd.:ct3:cvrVX800:
+ dmi.product.name: VX800
+ dmi.product.version: 1.0
+ dmi.sys.vendor: VIA Technologies Ltd.
** Attachment added: "AcpiTables.txt"
https://bugs.launchpad.net/bugs/805205/+attachment/2979737/+files/AcpiTables.txt
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https://bugs.launchpad.net/bugs/805205
Title:
VIA Nano hangs on some CPU scaling governors
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