It seems that the cpu's fan of my laptop sometimes have a quite strange behavior, cycling from low to high speeds (and making noise) as if it was based on a clock instead of operating normally (fan speed changing accordingly to cpu temp)
Two months ago, fan was going high speed quite immediately after startup, so I opened my laptop and cleaned all the dust. There was some but not so much as I do clean it every spring. It seemed to fix the issue, but now this occurs randomly every 2-3 weeks (I use it everyday), so I reboot my laptop and then it's ok for some time.
Here's a graph of it with what I consider normal operating, with fan speed adjusting to temp : And when cycling without adjusting to temp : And here is my system info :
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System: Host: spinoza Kernel: 4.4.0-130-generic x86_64 (64 bit) Desktop: Cinnamon 3.6.7 Distro: Linux Mint 18.3 Sylvia Machine: System: ASUSTeK (portable) product: UX51VZA v: 1.0 Mobo: ASUSTeK model: UX51VZA v: 1.0 Bios: American Megatrends v: UX51VZA.204 date: 12/03/2012 CPU: Quad core Intel Core i7-3612QM (-HT-MCP-) cache: 6144 KB clock speeds: max: 3100 MHz 1: 1239 MHz 2: 2366 MHz 3: 1292 MHz 4: 1216 MHz 5: 1253 MHz 6: 1220 MHz 7: 1360 MHz 8: 1385 MHz Graphics: Card-1: Intel 3rd Gen Core processor Graphics Controller Card-2: NVIDIA GK107M [GeForce GT 650M] Display Server: X.Org 1.18.4 drivers: intel (unloaded: fbdev,vesa) Resolution: email@example.com GLX Renderer: Mesa DRI Intel Ivybridge Mobile GLX Version: 3.0 Mesa 18.0.5 Audio: Card Intel 7 Series/C210 Series Family High Definition Audio Controller driver: snd_hda_intel Sound: Advanced Linux Sound Architecture v: k4.4.0-130-generic Network: Card-1: Intel Centrino Advanced-N 6235 driver: iwlwifi IF: wlp3s0 state: up mac: <filter> Card-2: Qualcomm Atheros AR8151 v2.0 Gigabit Ethernet driver: atl1c IF: enp4s0 state: down mac: <filter> Drives: HDD Total Size: 256.1GB (17.7% used) ID-1: /dev/sda model: SanDisk_SD5SE212 size: 128.0GB ID-2: /dev/sdb model: SanDisk_SD5SE212 size: 128.0GB Partition: ID-1: / size: 227G used: 35G (17%) fs: ext4 dev: /dev/md0p1 ID-2: swap-1 size: 8.47GB used: 0.00GB (0%) fs: swap dev: /dev/sda3 RAID: Device-1: /dev/md0 - active raid: 0 components: online: sda2 sdb1 Sensors: System Temperatures: cpu: 46.0C mobo: N/A Fan Speeds (in rpm): cpu: 2900 Info: Processes: 233 Uptime: 20 min Memory: 1289.9/7868.7MB Client: Shell (bash) inxi: 2.2.35
dmesg | grep microcode
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[ 0.000000] microcode: CPU0 microcode updated early to revision 0x1f, date = 2018-02-07 [ 0.179054] microcode: CPU1 microcode updated early to revision 0x1f, date = 2018-02-07 [ 0.182619] microcode: CPU2 microcode updated early to revision 0x1f, date = 2018-02-07 [ 0.186275] microcode: CPU3 microcode updated early to revision 0x1f, date = 2018-02-07 [ 1.382064] microcode: CPU0 sig=0x306a9, pf=0x10, revision=0x1f [ 1.382094] microcode: CPU1 sig=0x306a9, pf=0x10, revision=0x1f [ 1.382101] microcode: CPU2 sig=0x306a9, pf=0x10, revision=0x1f [ 1.382126] microcode: CPU3 sig=0x306a9, pf=0x10, revision=0x1f [ 1.382135] microcode: CPU4 sig=0x306a9, pf=0x10, revision=0x1f [ 1.382166] microcode: CPU5 sig=0x306a9, pf=0x10, revision=0x1f [ 1.382174] microcode: CPU6 sig=0x306a9, pf=0x10, revision=0x1f [ 1.382199] microcode: CPU7 sig=0x306a9, pf=0x10, revision=0x1f [ 1.382261] microcode: Microcode Update Driver: v2.01 <firstname.lastname@example.org>, Peter Oruba
Quite strange isn't it ? Any clue welcome !