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

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Date: Tue, 20 Feb 2024 17:15:13 +0100
From: Paul Menzel <pmenzel@...gen.mpg.de>
To: Jarkko Nikula <jarkko.nikula@...ux.intel.com>
Cc: linux-i2c@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: irq/51-DLL075B:01 in D state without touchpad usage, interrupts
 increase

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?


Kind regards,

Paul
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