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 Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1497520 Title: Slow performance after resuming from/on battery (CPUs do not scale above 800MHz) with intel_pstate To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1497520/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
