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[SOLVED MAYBE] Fan speed on laptop
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shimitar
Apprentice
Apprentice


Joined: 23 Nov 2003
Posts: 291
Location: Italy, Torino

PostPosted: Mon May 04, 2020 11:32 am    Post subject: [SOLVED MAYBE] Fan speed on laptop Reply with quote

Hi all!
i have an Asus UX303U laptop. It's based on an Intel Core 7, it's a Skylake CPU with a cmbined Intel + NVIDIA card (i don't use it, intel is fine for me, no nouveau or nvidia drivers installed).
I have been using it for three years without too many issues.

Recently i moved to kernel 5.4 (i was still on 4.19 before), i also did an upgrade to profile 17.1 and enabled the thermald daemon and stuff.

A few days ago i noticed the laptop was very noisy, the fans where going at full all the time. Well, it happens, they get clogged... So i openend the laptop, removed the fans and carefully cleaned them (incidentally i discovered the battery had puffed up, so i removed it and i am in the process of acquiring a new one. I always run on AC anyway).

Well, after closing up the laptop i discovered that.. it's worse! The reason is that now the clean fans move much more air and so the noise is just worse.

So i did some more investigating. I looked into the fan control wiki page and the lm_sensors stuff.... Seems like no matther what i do my fans are always at full speed, even if the CPU temperature is down to 36°C, still full speed. CPU goes up to 66°C under load? Stil full speed.

It's not only very annoying, but i am pretty sure it was NOT like this a couple of week ago.

I tried many things, with no avail.
1. Disable thermald
2. Disable laptop-mode-tools
3. update cpu microcode
4. change governor (seems that on my cpu only "performance" works, it has built-in governor in hardware i discovered)
5. rebuild kernel, enable more SPI/W1 ecc stuff

No matter what, i cannot find any way to control the fan speed nor understand why it does not scale down anymore.

LM_sensors says: (i am building a new kernel at this time, this is why it's at 66°C)
Code:

coretemp-isa-0000
Adapter: ISA adapter
Package id 0:  +66.0 C  (high = +100.0 C, crit = +100.0 C)
Core 0:        +66.0 C  (high = +100.0 C, crit = +100.0 C)
Core 1:        +64.0 C  (high = +100.0 C, crit = +100.0 C)

BAT0-acpi-0
Adapter: ACPI interface
in0:              N/A 

iwlwifi_1-virtual-0
Adapter: Virtual device
temp1:        +38.0 C 

pch_skylake-virtual-0
Adapter: Virtual device
temp1:        +55.0 C 

acpitz-acpi-0
Adapter: ACPI interface
temp1:        +66.0 C  (crit = +103.0 C)


ls-pci says:
Code:

00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Host Bridge/DRAM Registers (rev 08)
00:02.0 VGA compatible controller: Intel Corporation Skylake GT2 [HD Graphics 520] (rev 07)
00:04.0 Signal processing controller: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem (rev 08)
00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller (rev 21)
00:14.2 Signal processing controller: Intel Corporation Sunrise Point-LP Thermal subsystem (rev 21)
00:16.0 Communication controller: Intel Corporation Sunrise Point-LP CSME HECI #1 (rev 21)
00:17.0 SATA controller: Intel Corporation Sunrise Point-LP SATA Controller [AHCI mode] (rev 21)
00:1c.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #1 (rev f1)
00:1c.5 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #6 (rev f1)
00:1f.0 ISA bridge: Intel Corporation Sunrise Point-LP LPC Controller (rev 21)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)
00:1f.3 Audio device: Intel Corporation Sunrise Point-LP HD Audio (rev 21)
00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
01:00.0 3D controller: NVIDIA Corporation GM108M [GeForce 940M] (rev a2)
02:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59)


Does anybody have any suggestion?
Short of trying 4.19 kernel back, which i don't want to...
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Willy Gardiol
willy@gardiol.org


Last edited by shimitar on Fri May 08, 2020 7:30 pm; edited 1 time in total
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dr_wulsen
Tux's lil' helper
Tux's lil' helper


Joined: 21 Aug 2013
Posts: 132
Location: Austria

PostPosted: Fri May 08, 2020 5:35 pm    Post subject: Reply with quote

Could this be a BIOS/UEFI setting?
I've never bothered letting the OS control my fans, on my desktop I wouldn't even know how to control them manually through the OS.
Instead I've set them to a custom mode in my UEFI (not all support that, sure) - but maybe you have an option there that will have influence on those squealing blades?

If you disable thermald for tests and giggles, does the behaviour change?
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shimitar
Apprentice
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Joined: 23 Nov 2003
Posts: 291
Location: Italy, Torino

PostPosted: Fri May 08, 2020 7:30 pm    Post subject: Reply with quote

Not 100% sure yet... but i think it was the NVIDIA onboard.

After i installed the NVIDIA proprietary drivers the fans started behaving again. I had to remove nouveau, install the NVIDIA driver and phisically power off the laptop. Just reboot did not do the trick.

To be honest i don't know why. I don't even use the NVIDIA adapter, only the integrated Intel i915 one. But it seems that not running the NVIDIA driver caused the laptop fans to go at full speed always.
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