| 2011-07-03 18:50:38 |
Eeqmcsq |
bug |
|
|
added bug |
| 2011-07-13 17:39:55 |
Brad Figg |
affects |
linux-meta (Ubuntu) |
linux (Ubuntu) |
|
| 2011-07-18 23:59:05 |
Brad Figg |
linux (Ubuntu): status |
New |
Incomplete |
|
| 2011-07-19 09:43:57 |
Eeqmcsq |
linux (Ubuntu): status |
Incomplete |
Confirmed |
|
| 2012-03-24 20:14:38 |
penalvch |
linux (Ubuntu): status |
Confirmed |
Incomplete |
|
| 2012-04-01 01:51:54 |
Eeqmcsq |
tags |
|
apport-collected oneiric |
|
| 2012-04-01 01:51:56 |
Eeqmcsq |
description |
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. |
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.
---
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. |
|
| 2012-04-01 01:51:58 |
Eeqmcsq |
attachment added |
|
AcpiTables.txt https://bugs.launchpad.net/bugs/805205/+attachment/2979737/+files/AcpiTables.txt |
|
| 2012-04-01 01:52:00 |
Eeqmcsq |
attachment added |
|
AlsaDevices.txt https://bugs.launchpad.net/bugs/805205/+attachment/2979738/+files/AlsaDevices.txt |
|
| 2012-04-01 01:52:03 |
Eeqmcsq |
attachment added |
|
AplayDevices.txt https://bugs.launchpad.net/bugs/805205/+attachment/2979739/+files/AplayDevices.txt |
|
| 2012-04-01 01:52:05 |
Eeqmcsq |
attachment added |
|
BootDmesg.txt https://bugs.launchpad.net/bugs/805205/+attachment/2979740/+files/BootDmesg.txt |
|
| 2012-04-01 01:52:07 |
Eeqmcsq |
attachment added |
|
Card0.Amixer.values.txt https://bugs.launchpad.net/bugs/805205/+attachment/2979741/+files/Card0.Amixer.values.txt |
|
| 2012-04-01 01:52:09 |
Eeqmcsq |
attachment added |
|
Card0.Codecs.codec.0.txt https://bugs.launchpad.net/bugs/805205/+attachment/2979742/+files/Card0.Codecs.codec.0.txt |
|
| 2012-04-01 01:52:11 |
Eeqmcsq |
attachment added |
|
CurrentDmesg.txt https://bugs.launchpad.net/bugs/805205/+attachment/2979743/+files/CurrentDmesg.txt |
|
| 2012-04-01 01:52:13 |
Eeqmcsq |
attachment added |
|
Lspci.txt https://bugs.launchpad.net/bugs/805205/+attachment/2979744/+files/Lspci.txt |
|
| 2012-04-01 01:52:14 |
Eeqmcsq |
attachment added |
|
PciMultimedia.txt https://bugs.launchpad.net/bugs/805205/+attachment/2979745/+files/PciMultimedia.txt |
|
| 2012-04-01 01:52:17 |
Eeqmcsq |
attachment added |
|
ProcCpuinfo.txt https://bugs.launchpad.net/bugs/805205/+attachment/2979746/+files/ProcCpuinfo.txt |
|
| 2012-04-01 01:52:18 |
Eeqmcsq |
attachment added |
|
ProcInterrupts.txt https://bugs.launchpad.net/bugs/805205/+attachment/2979747/+files/ProcInterrupts.txt |
|
| 2012-04-01 01:52:20 |
Eeqmcsq |
attachment added |
|
ProcModules.txt https://bugs.launchpad.net/bugs/805205/+attachment/2979748/+files/ProcModules.txt |
|
| 2012-04-01 01:52:22 |
Eeqmcsq |
attachment added |
|
PulseSinks.txt https://bugs.launchpad.net/bugs/805205/+attachment/2979749/+files/PulseSinks.txt |
|
| 2012-04-01 01:52:24 |
Eeqmcsq |
attachment added |
|
PulseSources.txt https://bugs.launchpad.net/bugs/805205/+attachment/2979750/+files/PulseSources.txt |
|
| 2012-04-01 01:52:26 |
Eeqmcsq |
attachment added |
|
UdevDb.txt https://bugs.launchpad.net/bugs/805205/+attachment/2979751/+files/UdevDb.txt |
|
| 2012-04-01 01:52:28 |
Eeqmcsq |
attachment added |
|
UdevLog.txt https://bugs.launchpad.net/bugs/805205/+attachment/2979752/+files/UdevLog.txt |
|
| 2012-04-01 01:52:32 |
Eeqmcsq |
attachment added |
|
WifiSyslog.txt https://bugs.launchpad.net/bugs/805205/+attachment/2979753/+files/WifiSyslog.txt |
|
| 2012-04-01 06:42:55 |
Eeqmcsq |
attachment added |
|
kern.log https://bugs.launchpad.net/ubuntu/+source/linux/+bug/805205/+attachment/2980401/+files/kern.log |
|
| 2012-04-29 15:05:33 |
penalvch |
tags |
apport-collected oneiric |
apport-collected kernel-bug-exists-upstream lucid oneiric |
|
| 2012-04-29 15:06:08 |
penalvch |
description |
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.
---
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. |
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
- 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.
---
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. |
|
| 2012-04-29 15:11:34 |
penalvch |
linux (Ubuntu): status |
Incomplete |
Triaged |
|
| 2012-04-29 15:11:45 |
penalvch |
bug task added |
|
linux |
|
| 2012-04-29 15:12:28 |
penalvch |
linux: status |
New |
Incomplete |
|
| 2012-04-29 20:55:20 |
Eeqmcsq |
bug watch added |
|
http://bugzilla.kernel.org/show_bug.cgi?id=43179 |
|
| 2012-04-29 21:23:05 |
penalvch |
linux: importance |
Undecided |
Unknown |
|
| 2012-04-29 21:23:05 |
penalvch |
linux: status |
Incomplete |
Unknown |
|
| 2012-04-29 21:23:05 |
penalvch |
linux: remote watch |
|
Linux Kernel Bug Tracker #43179 |
|
| 2012-04-29 21:26:25 |
Bug Watch Updater |
linux: status |
Unknown |
Confirmed |
|
| 2012-04-29 21:26:25 |
Bug Watch Updater |
linux: importance |
Unknown |
High |
|
| 2013-01-31 06:49:15 |
penalvch |
tags |
apport-collected kernel-bug-exists-upstream lucid oneiric |
apport-collected bios-outdated kernel-bug-exists-upstream-v3.4-rc4 lucid needs-upstream-testing oneiric |
|
| 2013-01-31 06:52:53 |
penalvch |
linux (Ubuntu): importance |
Undecided |
Low |
|
| 2013-01-31 06:52:53 |
penalvch |
linux (Ubuntu): status |
Triaged |
Incomplete |
|
| 2013-01-31 22:29:08 |
Bug Watch Updater |
linux: status |
Confirmed |
Incomplete |
|
| 2013-02-10 12:54:50 |
penalvch |
linux (Ubuntu): status |
Incomplete |
Invalid |
|
| 2013-02-10 12:55:21 |
penalvch |
bug task deleted |
linux |
|
|
