linux-kernel - Re: irq/51-DLL075B:01 in D state without touchpad usage, interrupts increase

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Date: Thu, 22 Feb 2024 17:16:31 +0200
From: Jarkko Nikula <jarkko.nikula@...ux.intel.com>
To: Paul Menzel <pmenzel@...gen.mpg.de>
Cc: linux-i2c@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: irq/51-DLL075B:01 in D state without touchpad usage, interrupts
 increase

Hi

On 2/20/24 18:15, Paul Menzel wrote:
> Dear Linux folks,
> 
> 
> On a Dell XPS 13 9360 with Debian sid/unstable and Linux 6.8-rc4+ (and 
> probably before), I sometimes notice the fan spinning up, and trying to 
> figure out why, I noticed that `top` showed `irq/51-DLL075B:01` in state 
> D (uninterruptible sleep (usually IO)). That is without using the 
> touchpad. I am using an external USB keyboard and an external USB mouse.
> 
> 
>      $ sudo dmesg | grep -e "DMI:" -e "Linux version" -e microcode
>          [    0.000000] Linux version 6.8.0-rc4+ 
> (build@...emianrhapsody.molgen.mpg.de) (gcc (Debian 13.2.0-13) 13.2.0, 
> GNU ld (GNU Binutils for Debian) 2.42) #25 SMP PREEMPT_DYNAMIC Sat Feb 
> 17 05:39:03 CET 2024
>      [    0.000000] DMI: Dell Inc. XPS 13 9360/0596KF, BIOS 2.21.0 
> 06/02/2022
>      [    0.367292] microcode: Current revision: 0x000000f4
>      [    0.367293] microcode: Updated early from: 0x000000f0
> 
>      $ sudo dmesg | grep DLL075B
>      [    0.967975] input: DLL075B:01 06CB:76AF Mouse as 
> /devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-2/i2c-DLL075B:01/0018:06CB:76AF.0001/input/input2
>      [    0.968302] input: DLL075B:01 06CB:76AF Touchpad as 
> /devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-2/i2c-DLL075B:01/0018:06CB:76AF.0001/input/input3
>      [    0.968569] hid-generic 0018:06CB:76AF.0001: input,hidraw0: I2C 
> HID v1.00 Mouse [DLL075B:01 06CB:76AF] on i2c-DLL075B:01
>      [   19.753775] input: DLL075B:01 06CB:76AF Mouse as 
> /devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-2/i2c-DLL075B:01/0018:06CB:76AF.0001/input/input17
>      [   19.753950] input: DLL075B:01 06CB:76AF Touchpad as 
> /devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-2/i2c-DLL075B:01/0018:06CB:76AF.0001/input/input18
>      [   19.754654] hid-multitouch 0018:06CB:76AF.0001: input,hidraw0: 
> I2C HID v1.00 Mouse [DLL075B:01 06CB:76AF] on i2c-DLL075B:01
> 
>  From `top`:
> 
>      206 root     -51   0       0      0      0 D   1,7   0,0   8:45.46 
> irq/51-DLL075B:01
> 
>      $ ps aux | grep 'irq/51'
>      root         206  0.2  0.0      0     0 ?        D    Feb17  12:11 
> [irq/51-DLL075B:01]
> 
> The interrupts increase though by around 610 per second (without using 
> the device):
> 
>      $ for i in $(seq 1 10); do LANG= date; sudo grep -e '17:' -e '51:' 
> /proc/interrupts; sleep 1; done
>      Tue Feb 20 17:04:23 CET 2024
>        17: 1631256120          0          0    6452384  IR-IO-APIC 
> 17-fasteoi   idma64.1, i2c_designware.1
>        51:   25255617     109943          0          0  IR-IO-APIC 
> 51-fasteoi   DLL075B:01
>      Tue Feb 20 17:04:27 CET 2024
>        17: 1631295844          0          0    6452384  IR-IO-APIC 
> 17-fasteoi   idma64.1, i2c_designware.1
>        51:   25256229     109943          0          0  IR-IO-APIC 
> 51-fasteoi   DLL075B:01
>      Tue Feb 20 17:04:28 CET 2024
>        17: 1631335618          0          0    6452384  IR-IO-APIC 
> 17-fasteoi   idma64.1, i2c_designware.1
>        51:   25256843     109943          0          0  IR-IO-APIC 
> 51-fasteoi   DLL075B:01
>      Tue Feb 20 17:04:29 CET 2024
>        17: 1631375224          0          0    6452384  IR-IO-APIC 
> 17-fasteoi   idma64.1, i2c_designware.1
>        51:   25257454     109943          0          0  IR-IO-APIC 
> 51-fasteoi   DLL075B:01
>      Tue Feb 20 17:04:30 CET 2024
>        17: 1631415636          0          0    6452384  IR-IO-APIC 
> 17-fasteoi   idma64.1, i2c_designware.1
>        51:   25258076     109943          0          0  IR-IO-APIC 
> 51-fasteoi   DLL075B:01
>      Tue Feb 20 17:04:31 CET 2024
>        17: 1631455174          0          0    6452384  IR-IO-APIC 
> 17-fasteoi   idma64.1, i2c_designware.1
>        51:   25258687     109943          0          0  IR-IO-APIC 
> 51-fasteoi   DLL075B:01
>      Tue Feb 20 17:04:32 CET 2024
>        17: 1631494990          0          0    6452384  IR-IO-APIC 
> 17-fasteoi   idma64.1, i2c_designware.1
>        51:   25259300     109943          0          0  IR-IO-APIC 
> 51-fasteoi   DLL075B:01
>      Tue Feb 20 17:04:33 CET 2024
>        17: 1631534944          0          0    6452384  IR-IO-APIC 
> 17-fasteoi   idma64.1, i2c_designware.1
>        51:   25259915     109943          0          0  IR-IO-APIC 
> 51-fasteoi   DLL075B:01
>      Tue Feb 20 17:04:34 CET 2024
>        17: 1631574647          0          0    6452384  IR-IO-APIC 
> 17-fasteoi   idma64.1, i2c_designware.1
>        51:   25260527     109943          0          0  IR-IO-APIC 
> 51-fasteoi   DLL075B:01
>      Tue Feb 20 17:04:35 CET 2024
>        17: 1631613552          0          0    6452384  IR-IO-APIC 
> 17-fasteoi   idma64.1, i2c_designware.1
>        51:   25261130     109943          0          0  IR-IO-APIC 
> 51-fasteoi   DLL075B:01
> 
> The D state increases the load average.
> 
> Is that the expected behavior?
> 
No this is not. Touchpad appears to be firing interrupt line 51 
continuously and then drivers/hid/i2c-hid/i2c-hid-core.c: i2c_hid_irq() 
is trying to read input from touchpad over I2C bus.

Not sure is this HW failure or system FW error (there are bad ACPI 
tables out there misconfiguring things etc).