Without any prior warning the CPU in my laptop (an Acer V15 Nitro) is now always throttled to 400MHZ, which is very annoying of course.
I've played around with detaching the battery for some time, booting and rebooting with the HDMI cable attached or unattached, I booted into 18.04 (I run 19.10), same thing.
Only thing that made a difference, was to go to sleep mode and then wake the machine up again. For a short moment, the throttling is gone and the cpu does what it should. However, the moment I start a program the freq drops to 400 again and stays there.
The only difference that I noticed is that the cpu fan seems to be making clicking sounds. Every 8-10 seconds it clicks a few times. I am not sure if this is connected.
I tried to run pwmconfig in hopes of finding out if something is wrong with the fan, but it just returned that there are no pwm-capable sensor modules installed. (sensor-detect didn't help either)
Here's what lscpu spits out:
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): 4
On-line CPU(s) list: 0-3
Thread(s) per core: 2
Core(s) per socket: 2
Socket(s): 1
NUMA node(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 78
Model name: Intel(R) Core(TM) i7-6500U CPU @ 2.50GHz
Stepping: 3
CPU MHz: 400.001
CPU max MHz: 3100,0000
CPU min MHz: 400,0000
BogoMIPS: 5199.98
Virtualization: VT-x
L1d cache: 64 KiB
L1i cache: 64 KiB
L2 cache: 512 KiB
L3 cache: 4 MiB
NUMA node0 CPU(s): 0-3
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_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmpe
rf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt
tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb invpcid_single pti ssbd ibrs ib
pb stibp tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid mpx rdseed a
dx smap clflushopt intel_pt xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_ep
p md_clear flush_l1d
I'd be very grateful for any ideas or tips to solve this problem.
Edit: Sensor info. At these temps the CPU was throttled already.
pch_skylake-virtual-0
Adapter: Virtual device
temp1: +47.5°C
BAT0-acpi-0
Adapter: ACPI interface
in0: +12.60 V
curr1: +1.15 A
ath10k_hwmon-pci-0300
Adapter: PCI adapter
temp1: +39.0°C
coretemp-isa-0000
Adapter: ISA adapter
Package id 0: +47.0°C (high = +100.0°C, crit = +100.0°C)
Core 0: +47.0°C (high = +100.0°C, crit = +100.0°C)
Core 1: +44.0°C (high = +100.0°C, crit = +100.0°C)
acpitz-acpi-0
Adapter: ACPI interface
temp1: +47.0°C (crit = +99.0°C)
temp2: +41.0°C (crit = +92.0°C)
Adapter: PCI adapter temp1: +39.0°C
coretemp-isa-0000 Adapter: ISA adapter Package id 0: +41.0°C (high = +100.0°C, crit = +100.0°C) Core 0: +41.0°C (high = +100.0°C, crit = +100.0°C) Core 1: +38.0°C (high = +100.0°C, crit = +100.0°C)
Adapter: ACPI interface temp1: +40.0°C (crit = +99.0°C) temp2: +39.0°C (crit = +92.0°C) `
– Viktor Gruber Jan 24 '20 at 09:26