You have been subscribed to a public bug: 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. ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: bot-comment cpu frequency -- Maximum CPU frequency incorrect and there is no CPU scaling https://bugs.launchpad.net/bugs/1396291 You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
