[Bug 203191] The fan speed reports to 65535, despite the fan is stopped

[Bug 203191] The fan speed reports to 65535, despite the fan is stopped

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=203191

--- Comment #7 from Matthias Schiffer (mschiffer@universe-factory.net) ---
The T470 (without the 's' suffix) is affected as well. Still reproducible with
the latest BIOS 1.65 and Linux 5.11.6.

I believe the issue is not directly related to suspend/resume, as I don't use
suspend. Instead, the fan control can break any time the fan is supposed to
spin up, which may be when waking up from suspend, or simply because of
increased CPU workload.

Whenever the systems gets into the broken state:

- the fan is not spinning at all
- hwmon and /proc/acpi/ibm/fan report 65535 RPM
- manual control via /proc/acpi/ibm/fan is ignored (Note: I normally don't use
this interface, but rely on the builtin fan control)
- only a full poweroff will fix the issue. When attempting to reboot without a
poweroff, the BIOS will refuse to boot with a "Fan error" message.

As far as I remember, the issue originally started when Lenovo fixed a BIOS
issue that caused the fan to hang at 100% after suspend occasionally a few
years ago.

I'd be happy to provide any information that may help fix this issue, as I'm
seeing it pretty much daily.

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[Bug 203191] The fan speed reports to 65535, despite the fan is stopped

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https://bugzilla.kernel.org/show_bug.cgi?id=203191

Bhack (s.fabri10@gmail.com) changed:

           What    |Removed                     |Added
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                 CC|                            |s.fabri10@gmail.com

--- Comment #11 from Bhack (s.fabri10@gmail.com) ---
I can still confirm this bus with Linux 5.19.6

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[Bug 203191] The fan speed reports to 65535, despite the fan is stopped

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https://bugzilla.kernel.org/show_bug.cgi?id=203191

--- Comment #12 from Stefano Fabri (s.fabri@deeperception.eu) ---
Kernel 6.0.3

- cat /sys/devices/platform/thinkpad_hwmon/hwmon/hwmon7/fan2_input is always
fixed at: 65535

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[Bug 203191] The fan speed reports to 65535, despite the fan is stopped

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https://bugzilla.kernel.org/show_bug.cgi?id=203191

--- Comment #13 from Hans de Goede (jwrdegoede@fedoraproject.org) ---
(In reply to Stefano Fabri from comment #12)
> Kernel 6.0.3
> 
> - cat /sys/devices/platform/thinkpad_hwmon/hwmon/hwmon7/fan2_input is always
> fixed at: 65535

There now sometimes being a fan2_input stuck at 65535 is a different issue
which actually is a kernel bug. This is fixed by this patch, which I will send
to Linux real soon:

https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/commit/?h=fixes&id=a10d50983f7befe85acf95ea7dbf6ba9187c2d70

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[Bug 203191] The fan speed reports to 65535, despite the fan is stopped

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https://bugzilla.kernel.org/show_bug.cgi?id=203191

Walter (walter@derwalter.com) changed:

           What    |Removed                     |Added
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                 CC|                            |walter@derwalter.com

--- Comment #14 from Walter (walter@derwalter.com) ---
Just wanted to know it this will come or not,
my ThinkPad X201, running on 5.19.0-35-generic
still produces the bug, after sleep only heat,
fan1 shows 65535rmp but isn't moving.

only resolution: shutdown, remove battery and
power cord, wait, boot.


dualboot windows shows no problem with the fan and sleep mode.

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[Bug 203191] The fan speed reports to 65535, despite the fan is stopped

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https://bugzilla.kernel.org/show_bug.cgi?id=203191

Charalampos Mitrodimas (charmitro@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |charmitro@gmail.com

--- Comment #15 from Charalampos Mitrodimas (charmitro@gmail.com) ---
Confirming on TP-T470s, kernel version 5.15.0-69-generic.

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[Bug 203191] The fan speed reports to 65535, despite the fan is stopped

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https://bugzilla.kernel.org/show_bug.cgi?id=203191

antony.gelberg@gmail.com changed:

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                 CC|                            |antony.gelberg@gmail.com

--- Comment #16 from antony.gelberg@gmail.com ---
Did anyone get anywhere with this? Suffering as well, P14s gen 2, Ubuntu 22.04
LTS, kernel 5.14.0-1048-oem, latest BIOS N34ET57W (1.57).

Not using thinkfan, laptop has always been pretty reliable for the last couple
of years; this is a recent-ish problem for me, having to reboot every few hours
is painful.

Am considering a warranty repair but will be inconvenient to be without laptop
and unsure if it is a hardware problem.

Has anyone noticed anything in the system logs at all? I added a fan speed
indicator in my XFCE panel to check (usually when I'm like hmm, the laptop is
running slowly then I look at the fan speed and it's 65535).

Also, often, I'll hear the fan struggling to start running like brr brr, then
sometimes it runs normally (2000-4000 RPM on average) but most times it's 65535
and a heating CPU.

Also, when I reboot, I get the BIOS Fan Error screen and the laptop powers off.
Then I power it back on and things run normally for x hours.

The bug is in NEEDINFO but what info is needed?

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[Bug 203191] The fan speed reports to 65535, despite the fan is stopped

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Jean Delvare (jdelvare@suse.de) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |ASSIGNED

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[Bug 203191] The fan speed reports to 65535, despite the fan is stopped

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https://bugzilla.kernel.org/show_bug.cgi?id=203191

--- Comment #17 from antony.gelberg@gmail.com ---
Circling back with an update.

More recently, I suddenly got 10 days without the issue occurring. I assumed
that it was better, but today it's back again.

I've upgraded to 6.2.0-37-generic, but the issue still occurs (only two hours
of uptime before rebooting).

So many people commented on this bug a while ago, is there still no insight
into whether this is a potential hardware issue? I'd love to hear what worked
(or not) for you because I can't believe everyone who commented has continued
to suffer the issue for 2-4 years; it makes it "impossible" to work
effectively.

I've opened a support ticket with Lenovo for a warranty repair but I am nervous
they will say there's nothing wrong as the fan does pass the stress test in the
BIOS / diagnostics (although I only ran it once).

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[Bug 203191] The fan speed reports to 65535, despite the fan is stopped

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https://bugzilla.kernel.org/show_bug.cgi?id=203191

--- Comment #18 from antony.gelberg@gmail.com ---
Apologies for the "spam". I noticed I have a `sensors` output before and after
the issue, and there are some other differences.

1. GPU went from reporting a temperature to N/A.
2. ucsi_source_psy_USBC000:002-isa-0000 went from reporting a voltage to zero.

Could this be related? Could it indicate a more widespread failure e.g.
motherboard fault than "just" the fan? Where would be a good place to get
further community insight before shipping it off for repair and waiting for the
possible "there is no hardware fault"?


Before:

$ sensors                               [156/156]
thinkpad-isa-0000                                                               
Adapter: ISA adapter                                                            
fan1:        4815 RPM                                                           
CPU:          +51.0°C                                                           
GPU:          +50.0°C                                                           
temp3:        +33.0°C                                                           
temp4:         +0.0°C                                                           
temp5:        +42.0°C                                                           
temp6:        +51.0°C                                                           
temp7:        +51.0°C                                                           
temp8:            N/A                                                           

coretemp-isa-0000                                                               
Adapter: ISA adapter                                                            
Package id 0:  +54.0°C  (high = +100.0°C, crit = +100.0°C)                      
Core 0:        +54.0°C  (high = +100.0°C, crit = +100.0°C)                      
Core 1:        +52.0°C  (high = +100.0°C, crit = +100.0°C)                      
Core 2:        +51.0°C  (high = +100.0°C, crit = +100.0°C)                      
Core 3:        +48.0°C  (high = +100.0°C, crit = +100.0°C)                      

ucsi_source_psy_USBC000:001-isa-0000                                            
Adapter: ISA adapter                                                            
in0:           0.00 V  (min =  +0.00 V, max =  +0.00 V)                         
curr1:         0.00 A  (max =  +0.00 A)                                         

BAT0-acpi-0                                                                     
Adapter: ACPI interface                                                         
in0:          12.91 V                                                           

iwlwifi_1-virtual-0                                                             
Adapter: Virtual device                                                         
temp1:        +58.0°C                                                           

ucsi_source_psy_USBC000:002-isa-0000                                            
Adapter: ISA adapter                                                            
in0:           5.00 V  (min =  +5.00 V, max = +20.00 V)                         
curr1:         3.00 A  (max =  +3.25 A)                                         

nvme-pci-0400                                                                   
Adapter: PCI adapter                                                            
Composite:    +37.9°C  (low  =  -0.1°C, high = +79.8°C)                         
                       (crit = +82.8°C)                                         

acpitz-acpi-0                                                                   
Adapter: ACPI interface                                                         
temp1:        +51.0°C  (crit = +128.0°C)


After:

$ sensors
thinkpad-isa-0000
Adapter: ISA adapter
fan1:        65535 RPM
CPU:          +47.0°C  
GPU:              N/A  
temp3:        +34.0°C  
temp4:         +0.0°C  
temp5:        +42.0°C  
temp6:        +47.0°C  
temp7:        +47.0°C  
temp8:            N/A  

coretemp-isa-0000
Adapter: ISA adapter
Package id 0:  +47.0°C  (high = +100.0°C, crit = +100.0°C)
Core 0:        +46.0°C  (high = +100.0°C, crit = +100.0°C)
Core 1:        +46.0°C  (high = +100.0°C, crit = +100.0°C)
Core 2:        +46.0°C  (high = +100.0°C, crit = +100.0°C)
Core 3:        +45.0°C  (high = +100.0°C, crit = +100.0°C)

ucsi_source_psy_USBC000:001-isa-0000
Adapter: ISA adapter
in0:           0.00 V  (min =  +0.00 V, max =  +0.00 V)
curr1:         0.00 A  (max =  +0.00 A)

BAT0-acpi-0
Adapter: ACPI interface
in0:          12.08 V  

iwlwifi_1-virtual-0
Adapter: Virtual device
temp1:        +44.0°C  

ucsi_source_psy_USBC000:002-isa-0000
Adapter: ISA adapter
in0:           0.00 V  (min =  +0.00 V, max =  +0.00 V)
curr1:         0.00 A  (max =  +0.00 A)

nvme-pci-0400
Adapter: PCI adapter
Composite:    +32.9°C  (low  =  -0.1°C, high = +79.8°C)
                       (crit = +82.8°C)

acpitz-acpi-0
Adapter: ACPI interface
temp1:        +47.0°C  (crit = +128.0°C)

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[Bug 203191] The fan speed reports to 65535, despite the fan is stopped

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--- Comment #19 from antony.gelberg@gmail.com ---
Okay, final one (oh that Bugzilla would let one edit comments).

About the above, I realized that the discrepancy in
ucsi_source_psy_USBC000:002-isa-0000 is because the PSU was unplugged in the
second sample.

Also the GPU is now reporting temperature again (not sure if this is related to
me reconnecting the PSU).

:shrug:

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[Bug 203191] The fan speed reports to 65535, despite the fan is stopped

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--- Comment #20 from antony.gelberg@gmail.com ---
Following up here. My laptop underwent warranty repair and all seems okay now.
They replaced the fan module and the motherboard as they couldn't tell which
was responsible due to the intermittent nature of the problem.

So I would say that it looks like this should be closed; if the problem still
occurs I will report back.

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