For your Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz processor, what is the normal minimum pstate? I ask because I have only seen on battery power resume from suspend issues that are related to Clock Modulation becoming enabled. i.e. I am wondering if 800MHz is a normal minimum frequency or below the normal minimum.
One way, would be to do: cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_min_freq 1600000 1600000 1600000 1600000 1600000 1600000 1600000 1600000 and you can see that on my computer ( Intel(R) Core(TM) i7-2600K CPU @ 3.40GHz ), the minimum pstate is 16. I'm not sure yet if our issues are related, but on my computer, I also am seeing odd stuff on resume from suspend (I didn't used to), but my CPU frequencies are not stuck low, but rather never go below pstate 24, even though the driver is asking for lower. I also get the same lack of restoring the proper governor on all the CPUs except CPU 0 (and note that for an S3 suspend CPU 0 is the one that never goes off line). Example (no load): pstate being asked for: # rdmsr --bitfield 15:8 -d -a 0x199 16 16 16 16 16 16 16 16 pstate that I am getting: # rdmsr --bitfield 15:8 -d -a 0x198 24 24 24 24 24 24 24 24 CPU freqs: # grep MHz /proc/cpuinfo cpu MHz : 2400.054 cpu MHz : 2399.921 cpu MHz : 2399.921 cpu MHz : 2399.921 cpu MHz : 2399.789 cpu MHz : 2399.789 cpu MHz : 2399.921 cpu MHz : 2399.921 -- 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/1497520 Title: Slow performance after resuming from/on battery (CPUs do not scale above 800MHz) with intel_pstate Status in linux package in Ubuntu: Incomplete Bug description: I have noticed slow performance after resuming from STR on battery. I can not trigger this always, but it seems to be related to suspending and resuming while on battery. The CPU scaling governors look like this then: % cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor powersave performance performance performance % cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_driver intel_pstate intel_pstate intel_pstate intel_pstate % cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_max_freq 3200000 3200000 3200000 3200000 When watching the current CPU frequencies, it can be seen that they don't go above 800000 ('watch grep \"cpu MHz\" /proc/cpuinfo'). I cannot see why they are limited to 800000. It looks like https://bugzilla.kernel.org/show_bug.cgi?id=61241, but /sys/devices/system/cpu/intel_pstate/max_perf_pct is at 100. Just writing the same setting for cpu0 again fixes it, and all CPUs will be scaled above 800MHz again: % echo powersave | sudo tee /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: linux-image-3.19.0-28-generic 3.19.0-28.30 ProcVersionSignature: Ubuntu 3.19.0-28.30-generic 3.19.8-ckt5 Uname: Linux 3.19.0-28-generic x86_64 ApportVersion: 2.17.2-0ubuntu1.4 Architecture: amd64 CurrentDesktop: Unity Date: Sat Sep 19 10:39:02 2015 HibernationDevice: RESUME=UUID=d39463f5-889e-42ba-a729-f3f442f0c8dd InstallationDate: Installed on 2012-05-28 (1208 days ago) InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425) MachineType: LENOVO 42992PG ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-28-generic root=/dev/mapper/vg0-rootlv ro quiet splash RelatedPackageVersions: linux-restricted-modules-3.19.0-28-generic N/A linux-backports-modules-3.19.0-28-generic N/A linux-firmware 1.143.3 SourcePackage: linux UpgradeStatus: Upgraded to vivid on 2015-05-14 (127 days ago) dmi.bios.date: 05/14/2015 dmi.bios.vendor: LENOVO dmi.bios.version: 8DET70WW (1.40 ) dmi.board.asset.tag: Not Available dmi.board.name: 42992PG 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:bvr8DET70WW(1.40):bd05/14/2015:svnLENOVO:pn42992PG:pvrThinkPadX220Tablet:rvnLENOVO:rn42992PG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 42992PG dmi.product.version: ThinkPad X220 Tablet dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1497520/+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
