I'm posting here because pstate is giving me problems as well, but in the opposite direction. Upon bootup and for several hours thereafter, scaling works correctly. But after a period of time something happens (which is of course not mentioned in any log) and scaling_max_freq is set to scaling_min_freq and cannot be changed at all.
root@ossy:/etc# cd /sys/devices/system/cpu/cpu0/cpufreq root@ossy:/sys/devices/system/cpu/cpu0/cpufreq# ls affected_cpus cpuinfo_transition_latency scaling_driver scaling_setspeed cpuinfo_cur_freq related_cpus scaling_governor cpuinfo_max_freq scaling_available_governors scaling_max_freq cpuinfo_min_freq scaling_cur_freq scaling_min_freq root@ossy:/sys/devices/system/cpu/cpu0/cpufreq# cat scaling_max_freq 1600000 root@ossy:/sys/devices/system/cpu/cpu0/cpufreq# cat cpuinfo_max_freq 3700000 root@ossy:/sys/devices/system/cpu/cpu0/cpufreq# cat cpuinfo_max_freq > scaling_max_freq root@ossy:/sys/devices/system/cpu/cpu0/cpufreq# cat scaling_max_freq 1600000 root@ossy:/sys/devices/system/cpu/cpu0/cpufreq# echo performance > scaling_governor root@ossy:/sys/devices/system/cpu/cpu0/cpufreq# cat scaling_governor performance root@ossy:/sys/devices/system/cpu/cpu0/cpufreq# cat cpuinfo_max_freq > scaling_max_freq root@ossy:/sys/devices/system/cpu/cpu0/cpufreq# cat scaling_max_freq 1600000 This happens whether or not I have Enhanced SpeedStep enabled in my BIOS. (This is also not a BIOS limit problem.) Disabling pstate entirely allows me to run at 3.3GHz all the time. Since powerclamp is loaded and thermald is running I'm still protected from overheating situations. Since this is a desktop I don't really care about the power usage but I can see where this would be a bigger problem for laptops. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1188647 Title: Please change intel_pstate default to disable Status in linux package in Ubuntu: Fix Released Bug description: 3.9 introduced a new default governor on SandyBridge CPUs called INTEL_PSTATE which, when built in and enabled (the default), removes all other governors (like our usual default, ondemand). 3.10 extended this to Ivybridge generation CPUs. In theory, this isn't an awful thing, as the new Intel pstate governor should be higher performance and give better power savings. In theory. In practice, it drives my CPUs to max frequency nearly constantly, spins my fans like mad and, somehow, does all of this while also eating enough CPU time in kernel threads to make my machine choppy, unresponsive, and unable to do simple things like play videos when I get off work. Therefore, I propose that we, for now, toggle intel_pstate to disable by default (I am using intel_pstate=disable on my command line right now, with great success), so it's still built in, and people can play with it, but it's off by default. ProblemType: Bug DistroRelease: Ubuntu 13.10 Package: linux-image-3.9.0-4-generic 3.9.0-4.9 ProcVersionSignature: Ubuntu 3.9.0-4.9-generic 3.9.4 Uname: Linux 3.9.0-4-generic x86_64 ApportVersion: 2.10.2-0ubuntu1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: adconrad 2574 F.... pulseaudio CurrentDmesg: [ 30.633035] init: plymouth-stop pre-start process (2079) terminated with status 1 [ 36.086916] br0: port 1(eth0) entered forwarding state Date: Fri Jun 7 08:48:56 2013 HibernationDevice: RESUME=UUID=73040efa-baec-458a-8307-3bca07b26c3c InstallationDate: Installed on 2012-12-09 (179 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20121209) MachineType: LENOVO 4173LPB MarkForUpload: True ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.9.0-4-generic root=UUID=2222aad5-ef31-4428-973f-71740fc7cb6a ro intel_pstate=disable quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.9.0-4-generic N/A linux-backports-modules-3.9.0-4-generic N/A linux-firmware 1.109 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 09/13/2012 dmi.bios.vendor: LENOVO dmi.bios.version: 8CET55WW (1.35 ) dmi.board.asset.tag: Not Available dmi.board.name: 4173LPB dmi.board.vendor: LENOVO dmi.board.version: Not Available dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.modalias: dmi:bvnLENOVO:bvr8CET55WW(1.35):bd09/13/2012:svnLENOVO:pn4173LPB:pvrThinkPadT420s:rvnLENOVO:rn4173LPB:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 4173LPB dmi.product.version: ThinkPad T420s dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1188647/+subscriptions -- 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
