I don't know if this occurred in a release prior to Trusty so I
downloaded 12.04.3 LTS (Precise Pangolin) - the distro linked to in your
post - and ran it from a USB stick. The short answer is that the
problem also exists in Precise. Slightly longer answer - the CPU is
recognised/named correctly but it only runs at 2.4 Ghz and there is no
CPU scaling. I could not get "cpupower frequency-info" to run (as per
original bug report) but running "cpufreq-info" in a terminal returns:
cpufrequtils 007: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to cpuf...@vger.kernel.org, please.
analyzing CPU 0:
driver: acpi-cpufreq
CPUs which run at the same hardware frequency: 0 1
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 10.0 us.
hardware limits: 2.40 GHz - 2.40 GHz
available frequency steps: 2.40 GHz, 2.40 GHz
available cpufreq governors: conservative, ondemand, userspace, powersave,
performance
current policy: frequency should be within 2.40 GHz and 2.40 GHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 2.40 GHz.
cpufreq stats: 2.40 GHz:78.72%, 2.40 GHz:21.28% (1610)
analyzing CPU 1:
driver: acpi-cpufreq
CPUs which run at the same hardware frequency: 0 1
CPUs which need to have their frequency coordinated by software: 1
maximum transition latency: 10.0 us.
hardware limits: 2.40 GHz - 2.40 GHz
available frequency steps: 2.40 GHz, 2.40 GHz
available cpufreq governors: conservative, ondemand, userspace, powersave,
performance
current policy: frequency should be within 2.40 GHz and 2.40 GHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 2.40 GHz.
cpufreq stats: 2.40 GHz:95.56%, 2.40 GHz:4.44% (259)
I also installed CPU Frequency Scaling Indicator, as per my original bug
report, and it behaves the same - showing only 2.4 Ghz and 2.4 Ghz
(turbo mode) as available frequencies, and if I manually change to
Powersave or Performance it makes no difference to the speed the CPU
runs at. Precise (mis)behaves exactly the same as Trusty.
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https://bugs.launchpad.net/bugs/1396291
Title:
Maximum CPU frequency incorrect and there is no CPU scaling
Status in “linux” package in Ubuntu:
Incomplete
Bug description:
I have an Acer Aspire 5720 and it is set up to dual boot Vista and
ubuntu 14.04 LTS. From new the laptop came with an Intel T7300 2.00
Ghz CPU and 1 GB DDR2 RAM. A few weeks ago I upgraded to 4 GB RAM,
which works perfectly, and a few days ago I upgraded to an Intel T9300
2.5 Ghz CPU.
The BIOS (up to date), Vista and ubuntu all recognise the CPU
correctly as:
"Intel(R) Core(TM)2 Duo CPU T9300 @ 2.50 GHz".
Vista allows the CPU to run correctly at up to 2.5 Ghz and will step
the CPU speed lower when not needed, depending on which power settings
are chosen.
The problem is that ubuntu will only allow the CPU to run at a fixed
frequency of 2.4 Ghz, which is incorrect as it's a 2.5Ghz CPU, and
there is no stepping to lower the CPU frequency when max frequency is
not needed.
"cpupower frequency-info" in a terminal returns:
analyzing CPU 0:
driver: acpi-cpufreq
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 10.0 us.
hardware limits: 2.40 GHz - 2.40 GHz
available frequency steps: 2.40 GHz, 2.40 GHz
available cpufreq governors: conservative, ondemand, userspace, powersave,
performance
current policy: frequency should be within 2.40 GHz and 2.40 GHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 2.40 GHz.
cpufreq stats: 2.40 GHz:10.47%, 2.40 GHz:89.53% (12799)
boost state support:
Supported: yes
Active: yes
I have tried using ondemand, performance and powersave - nothing makes
any difference. I have also installed CPU Frequency Scaling Indicator
(which shows only 2.4 Ghz and 2.4 Ghz (turbo mode) as available
frequencies) and I have also tried TLP but nothing makes any
difference.
According to this website:
http://www.phoronix.com/scan.php?page=article&item=mobile_penryn&num=3
the T9300 CPU should have the following frequency steps:
2.50 GHz, 2.00 GHz, 1.60 GHz, 1.20 GHz and 800 MHz.
I have spent days trawling the internet for a solution but to no avail.
Hence filing this bug report in the hope a solution might be found.
---
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: i386
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq',
'/dev/snd/timer'] failed with exit code 1:
CurrentDesktop: Unity
DistroRelease: Ubuntu 14.04
HibernationDevice: RESUME=UUID=0c4e3b98-0d40-4db3-9f4d-d1c53eb96355
InstallationDate: Installed on 2014-04-23 (216 days ago)
InstallationMedia: It
MachineType: Acer Aspire 5720
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-40-generic
root=UUID=9675b492-c55a-4c72-991b-263a27d74d5e ro quiet splash
processor.ignore_ppc=1 vt.handoff=7
ProcVersionSignature: Ubuntu 3.13.0-40.69-generic 3.13.11.10
RelatedPackageVersions:
linux-restricted-modules-3.13.0-40-generic N/A
linux-backports-modules-3.13.0-40-generic N/A
linux-firmware 1.127.8
Tags: trusty
Uname: Linux 3.13.0-40-generic i686
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 11/10/2008
dmi.bios.vendor: Acer
dmi.bios.version: V1.45
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: eMachine
dmi.board.vendor: Acer
dmi.board.version: V1.45
dmi.chassis.type: 1
dmi.chassis.vendor: Acer
dmi.chassis.version: V1.45
dmi.modalias:
dmi:bvnAcer:bvrV1.45:bd11/10/2008:svnAcer:pnAspire5720:pvrV1.45:rvnAcer:rneMachine:rvrV1.45:cvnAcer:ct1:cvrV1.45:
dmi.product.name: Aspire 5720
dmi.product.version: V1.45
dmi.sys.vendor: Acer
---
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: i386
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq',
'/dev/snd/timer'] failed with exit code 1:
CurrentDesktop: Unity
DistroRelease: Ubuntu 14.04
HibernationDevice: RESUME=UUID=0c4e3b98-0d40-4db3-9f4d-d1c53eb96355
InstallationDate: Installed on 2014-04-23 (216 days ago)
InstallationMedia: It
MachineType: Acer Aspire 5720
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-40-generic
root=UUID=9675b492-c55a-4c72-991b-263a27d74d5e ro quiet splash
processor.ignore_ppc=1 vt.handoff=7
ProcVersionSignature: Ubuntu 3.13.0-40.69-generic 3.13.11.10
RelatedPackageVersions:
linux-restricted-modules-3.13.0-40-generic N/A
linux-backports-modules-3.13.0-40-generic N/A
linux-firmware 1.127.8
Tags: trusty
Uname: Linux 3.13.0-40-generic i686
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 11/10/2008
dmi.bios.vendor: Acer
dmi.bios.version: V1.45
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: eMachine
dmi.board.vendor: Acer
dmi.board.version: V1.45
dmi.chassis.type: 1
dmi.chassis.vendor: Acer
dmi.chassis.version: V1.45
dmi.modalias:
dmi:bvnAcer:bvrV1.45:bd11/10/2008:svnAcer:pnAspire5720:pvrV1.45:rvnAcer:rneMachine:rvrV1.45:cvnAcer:ct1:cvrV1.45:
dmi.product.name: Aspire 5720
dmi.product.version: V1.45
dmi.sys.vendor: Acer
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