https://bugzilla.kernel.org/show_bug.cgi?id=213031
--- Comment #43 from PGNd (pgnet....@gmail.com) ---
it's my serial port.
dmesg | grep ttyS | grep I/O
[ 1.776602] 00:03: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200)
is a 16550A
setserial -g /dev/ttyS[0123456789] | grep -v unk
/dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4
stty -F /dev/ttyS0
speed 38400 baud; line = 0;
min = 1; time = 0;
-brkint -icrnl -imaxbel iutf8
-isig -icanon -iexten -echo -echoe -echok -echoctl -echoke
less /proc/interrupts
1 CPU0 CPU1 CPU2 CPU3
2 4: 0 0 0 1743 IO-APIC 4-edge
ttyS0
3 8: 0 0 0 0 IO-APIC
8-fasteoi rtc0
4 9: 0 0 0 0 IO-APIC
9-fasteoi acpi
5 18: 0 0 4 0 IO-APIC
18-fasteoi i801_smbus
6 86: 0 0 0 0 IO-APIC
86-fasteoi soc_dts
7 90: 241649 0 0 0 PCI-MSI 311296-edge
ahci[0000:00:13.0]
8 91: 0 368 0 0 PCI-MSI 327680-edge
xhci_hcd
9 92: 0 1 0 0 PCI-MSI
1048576-edge enp2s0
10 93: 0 0 716190 0 PCI-MSI
1048577-edge enp2s0-TxRx-0
11 94: 0 0 0 413704 PCI-MSI
1048578-edge enp2s0-TxRx-1
12 95: 409990 0 0 0 PCI-MSI
1048579-edge enp2s0-TxRx-2
13 96: 0 774810 0 0 PCI-MSI
1048580-edge enp2s0-TxRx-3
14 97: 0 0 1 0 PCI-MSI
1572864-edge enp3s0
15 98: 0 0 0 633608 PCI-MSI
1572865-edge enp3s0-TxRx-0
16 99: 404869 0 0 0 PCI-MSI
1572866-edge enp3s0-TxRx-1
17 100: 0 379214 0 0 PCI-MSI
1572867-edge enp3s0-TxRx-2
18 101: 0 0 757198 0 PCI-MSI
1572868-edge enp3s0-TxRx-3
19 102: 1183 0 0 0 PCI-MSI 32768-edge
i915
20 103: 0 17 0 0 PCI-MSI 425984-edge
mei_txe
21 104: 56 0 0 0 PCI-MSI 442368-edge
snd_hda_intel:card0
22 NMI: 21 22 24 17 Non-maskable
interrupts
23 LOC: 1248777 1112029 964671 719102 Local timer
interrupts
24 SPU: 0 0 0 0 Spurious interrupts
25 PMI: 21 22 24 17 Performance
monitoring interrupts
26 IWI: 1668 713 2961 3071 IRQ work interrupts
27 RTR: 0 0 0 0 APIC ICR read
retries
28 RES: 7295 9933 4263 2207 Rescheduling
interrupts
29 CAL: 36608 59082 62042 45137 Function call
interrupts
30 TLB: 294 77 116 143 TLB shootdowns
31 TRM: 0 0 0 0 Thermal event
interrupts
32 THR: 0 0 0 0 Threshold APIC
interrupts
33 DFR: 0 0 0 0 Deferred Error APIC
interrupts
34 MCE: 0 0 0 0 Machine check
exceptions
35 MCP: 0 0 0 0 Machine check polls
36 ERR: 0
37 MIS: 0
38 PIN: 0 0 0 0 Posted-interrupt
notification event
39 NPI: 0 0 0 0 Nested
posted-interrupt event
40 PIW: 0 0 0 0 Posted-interrupt
wakeup event
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