Arch Linux

s4nji

Member

Registered: 2015-07-17

Posts: 32

CPU fan at maximum speed in inspiron 3521 when idle (or almost)

Hi,
I own a dell inspiron 3521 laptop which has this configuration :

cpu:                                                            
                       Intel(R) Core(TM) i7-3537U CPU @ 2.00GHz, 2900 MHz
                       Intel(R) Core(TM) i7-3537U CPU @ 2.00GHz, 2880 MHz
                       Intel(R) Core(TM) i7-3537U CPU @ 2.00GHz, 2900 MHz
                       Intel(R) Core(TM) i7-3537U CPU @ 2.00GHz, 2897 MHz
keyboard:
                       Elan Microelectronics 2.4G RX
  /dev/input/event0    AT Translated Set 2 keyboard
mouse:
                       USB OPTICAL MOUSE
  /dev/input/mice      SynPS/2 Synaptics TouchPad
graphics card:
                       Intel 3rd Gen Core processor Graphics Controller
                       ATI Mars [Radeon HD 8500/8700M Series]
sound:
                       Intel 7 Series/C210 Series Chipset Family High Definition Audio Controller
storage:
                       Intel 7 Series Chipset Family 6-port SATA Controller [AHCI mode]
network:
  enp7s0               Realtek RTL8101E/RTL8102E PCI Express Fast Ethernet controller
  wlp8s0               Atheros AR9485 Wireless Network Adapter
network interface:
  wlp8s0               Ethernet network interface
  lo                   Loopback network interface
  enp7s0               Ethernet network interface
disk:
  /dev/sda             TOSHIBA MQ01ABD1
partition:
  /dev/sda1            Partition
  /dev/sda2            Partition
  /dev/sda3            Partition
  /dev/sda4            Partition
  /dev/sda5            Partition
  /dev/sda6            Partition
  /dev/sda7            Partition
cdrom:
  /dev/sr0             MATSHITA DVD+-RW UJ8C2
usb controller:
                       Intel 7 Series/C210 Series Chipset Family USB xHCI Host Controller
                       Intel 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #2
                       Intel 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #1
bios:
                       BIOS
bridge:
                       Intel 3rd Gen Core processor DRAM Controller
                       Intel Xeon E3-1200 v2/3rd Gen Core processor PCI Express Root Port
                       Intel 7 Series/C210 Series Chipset Family PCI Express Root Port 1
                       Intel 7 Series/C210 Series Chipset Family PCI Express Root Port 2
                       Intel HM76 Express Chipset LPC Controller
hub:
                       Linux 4.1.2-2-ARCH xhci-hcd xHCI Host Controller
                       Linux 4.1.2-2-ARCH xhci-hcd xHCI Host Controller
                       Linux 4.1.2-2-ARCH ehci_hcd EHCI Host Controller
                       Hub
                       Linux 4.1.2-2-ARCH ehci_hcd EHCI Host Controller
                       Hub
memory:
                       Main Memory
bluetooth:
                       Atheros Bluetooth USB Host Controller
unknown:
                       FPU
                       DMA controller
                       PIC
                       Timer
                       Keyboard controller
                       Intel 7 Series/C210 Series Chipset Family MEI Controller #1
                       Intel 7 Series/C210 Series Chipset Family SMBus Controller
                       Realtek USB2.0-CRW
  /dev/input/event15   Realtek Laptop_Integrated_Webcam_HD
  /dev/input/js0       Microsoft Unclassified device

Unlike Windows 7, most of the time (like 90 %) the fan is at its max speed even if no program is launched in Arch.

sensors gives :

radeon-pci-0100
Adapter: PCI adapter
temp1:            N/A  (crit = +120.0°C, hyst = +90.0°C)

coretemp-isa-0000
Adapter: ISA adapter
Physical id 0:  +50.0°C  (high = +87.0°C, crit = +105.0°C)
Core 0:         +48.0°C  (high = +87.0°C, crit = +105.0°C)
Core 1:         +45.0°C  (high = +87.0°C, crit = +105.0°C)

since the sensors command doesn't return the fan speed (because of some missing modules likely) I ran this command :

└─[$]> repeat 10 cat /sys/class/thermal/thermal_zone*/temp
52000
51000
52000
52000
52000
52000
52000
52000
52000
52000

Any ideas ?

PS 1 : I have not installed the proprietary driver of the Radeon graphic card.
PS 2 : I have installed TLP but did not solve the problem

Last edited by s4nji (2015-08-01 22:39:45)

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vgruk pharmacy

archie0

Member

Registered: 2012-02-26

Posts: 144

Re: CPU fan at maximum speed in inspiron 3521 when idle (or almost)

Hey.

Install 'Powertop' and go to the last tab, and make sure most of the entries are marked as 'Good'. The one that really lowered my temps is "Enable SATA link power management for hostX", and, as far as I know, by default, TLP only enables that one, when the laptop is running on battery power.