Hello,

I try to install touch panel on AFL-08A-N26/R/2G-R11 PC Panel. The installation program does not detect any PenMount module. This panel is ecquipped with Fintek F81866 Super IO. The support suggested on setting up irq sharing.

Dmesg during startup shows:
[ 0.921855] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[ 0.943440] 00:05: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
[ 0.965172] 00:06: ttyS2 at I/O 0x3e8 (irq = 10, base_baud = 115200) is a 16550A
[ 0.992712] 00:07: ttyS3 at I/O 0x2e8 (irq = 10, base_baud = 115200) is a 16550A
[ 1.020114] 00:08: ttyS1 at I/O 0x250 (irq = 10, base_baud = 115200) is a 16550A

3 serial ports uses the same irq.
How can I be sure that irq sharing is working fine? How can I check it?

Regards,
Robert

I believe you can check using this:
Look at the far-right column for comma separated values, IIRC these are using a shared IRQ when more than one is present. For example on my machine this entry:

Being shared by

In my case:

CPU0 CPU1 CPU2 CPU3
0: 157 0 0 0 IO-APIC 2-edge timer
4: 3 4 4 1 IO-APIC 4-edge
7: 45 0 0 0 IO-APIC 7-edge
8: 7 8 7 5 IO-APIC 8-edge rtc0
9: 0 0 0 0 IO-APIC 9-fasteoi acpi
10: 8 8 7 7 IO-APIC 10-edge
14: 0 0 0 0 IO-APIC 14-edge pata_legacy.0
15: 0 0 0 0 IO-APIC 15-edge pata_legacy.1
16: 0 0 0 0 IO-APIC 16-fasteoi uhci_hcd:usb5
18: 12 13 12 8 IO-APIC 18-fasteoi ath9k, uhci_hcd:usb4
19: 1553 1591 1632 1618 IO-APIC 19-fasteoi ata_piix, i801_smbus, uhci_hcd:usb3
23: 1 0 0 1 IO-APIC 23-fasteoi ehci_hcd:usb1, uhci_hcd:usb2
27: 1215 1264 1300 1276 PCI-MSI 524288-edge eth0
29: 34 70 187 112 PCI-MSI 442368-edge snd_hda_intel
NMI: 0 0 0 0 Non-maskable interrupts
LOC: 60911 54063 47512 38119 Local timer interrupts
SPU: 0 0 0 0 Spurious interrupts
PMI: 0 0 0 0 Performance monitoring interrupts
IWI: 0 0 0 0 IRQ work interrupts
RTR: 0 0 0 0 APIC ICR read retries
RES: 1145 1072 1196 959 Rescheduling interrupts
CAL: 667 500 993 1014 Function call interrupts
TLB: 31 27 27 26 TLB shootdowns
TRM: 0 0 0 0 Thermal event interrupts
THR: 0 0 0 0 Threshold APIC interrupts
DFR: 0 0 0 0 Deferred Error APIC interrupts
MCE: 0 0 0 0 Machine check exceptions
MCP: 11 11 11 11 Machine check polls
ERR: 45
MIS: 0
PIN: 0 0 0 0 Posted-interrupt notification event
PIW: 0 0 0 0 Posted-interrupt wakeup event


How to interpret this listing? I'm not sure.

Robert

The numbers in the first column is the IRQ

IRQ 10, as mentioned by your dmesg is;
* "8,8,7,7" is just the total number of interrupts made on each cpu.
* "IO-APIC" is the interrupt controller for that IRQ.
* "edge" is the type of interrupt.

I'm not sure how serial ports should show up in this output however.

Hi,

I did it by compiling and installing new kernel 4.16.7 with nr_uarts=6 set in the options. Then serial ttyS4 become visible and after setting irq sharing in F81866 the PenMount become active under x11.

Regards,
Robert

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