Arch Linux

gjvnq

Member

Registered: 2016-11-09

Posts: 4

i7-4700MQ CPU 2.40GHz running at 798MHz (Yes, below 1 GHz!)

My Lenovo Y410P laptop sometimes run increadibly slow for a few seconds to a few minutes.

Originally I thought it has something too do with the shitty nvidia drivers. Today however, I managed to figure out that the CPU is being severely under-clocked.

Should I go get my laptop physically cleaned and replace the thermal compounds?

Temperatures with just Chrome open with few tabs:

acpitz-acpi-0
Adapter: ACPI interface
temp1:         +0.0°C  (crit = +127.0°C)

coretemp-isa-0000
Adapter: ISA adapter
Package id 0:  +65.0°C  (high = +84.0°C, crit = +100.0°C)
Core 0:        +63.0°C  (high = +84.0°C, crit = +100.0°C)
Core 1:        +64.0°C  (high = +84.0°C, crit = +100.0°C)
Core 2:        +61.0°C  (high = +84.0°C, crit = +100.0°C)
Core 3:        +65.0°C  (high = +84.0°C, crit = +100.0°C)

Output of lscpu when things are going ok:

Architecture:                    x86_64
CPU op-mode(s):                  32-bit, 64-bit
Byte Order:                      Little Endian
Address sizes:                   39 bits physical, 48 bits virtual
CPU(s):                          8
On-line CPU(s) list:             0-7
Thread(s) per core:              2
Core(s) per socket:              4
Socket(s):                       1
NUMA node(s):                    1
Vendor ID:                       GenuineIntel
CPU family:                      6
Model:                           60
Model name:                      Intel(R) Core(TM) i7-4700MQ CPU @ 2.40GHz
Stepping:                        3
CPU MHz:                         1028.922
CPU max MHz:                     3400.0000
CPU min MHz:                     800.0000
BogoMIPS:                        4789.34
Virtualization:                  VT-x
L1d cache:                       128 KiB
L1i cache:                       128 KiB
L2 cache:                        1 MiB
L3 cache:                        6 MiB
NUMA node0 CPU(s):               0-7
Vulnerability Itlb multihit:     KVM: Mitigation: Split huge pages
Vulnerability L1tf:              Mitigation; PTE Inversion; VMX conditional cache flushes, SMT vulnerable
Vulnerability Mds:               Mitigation; Clear CPU buffers; SMT vulnerable
Vulnerability Meltdown:          Mitigation; PTI
Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl and seccomp
Vulnerability Spectre v1:        Mitigation; usercopy/swapgs barriers and __user pointer sanitization
Vulnerability Spectre v2:        Mitigation; Full generic retpoline, IBPB conditional, IBRS_FW, STIBP conditional
                                 , RSB filling
Vulnerability Tsx async abort:   Not affected
Flags:                           fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush 
                                 dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_ts
                                 c arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni
                                  pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid 
                                 sse4_1 sse4_2 movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm 
                                 abm cpuid_fault epb invpcid_single pti ssbd ibrs ibpb stibp tpr_shadow vnmi flex
                                 priority ept vpid ept_ad fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid xs
                                 aveopt dtherm ida arat pln pts md_clear flush_l1d

d_fajardo

Member

Registered: 2017-07-28

Posts: 1,568

Re: i7-4700MQ CPU 2.40GHz running at 798MHz (Yes, below 1 GHz!)

https://wiki.archlinux.org/index.php/CP … cy_scaling
If your cpu governor is in powesave, then it's normal to be under-clock when the cpu is not much needed. Try setting the cpu governor to performance to see if it changes.
Also you can install i7z to have another reading on temperature or if it matches the acpi one.