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@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx) (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).
