Hello Jean!

(In reply to Jean Delvare from comment #16)
> $ /sbin/lspci -nn | grep SMBus

00:13.0 System peripheral [0880]: Intel Corporation Atom processor C2000 SMBus 2.0 [8086:1f15] (rev 02)
00:1f.3 SMBus [0c05]: Intel Corporation Atom processor C2000 PCU SMBus [8086:1f3c] (rev 02)
 
> $ /sbin/lspci -xxx -s <device>
> (for each device listed abov

╭─root@Galactica /home/kostecki  
╰─➤  lspci -xxx -s 00:13.0
00:13.0 System peripheral: Intel Corporation Atom processor C2000 SMBus 2.0 (rev 02)
00: 86 80 15 1f 46 05 10 00 02 00 80 08 00 00 00 00
10: 04 40 f1 ff 0f 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 d9 15 20 08
30: 00 00 00 00 40 00 00 00 00 00 00 00 ff 01 00 00
40: 10 80 92 00 01 80 00 10 20 08 04 00 00 00 00 00
50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
60: 00 00 00 00 10 00 00 00 00 00 00 00 00 00 00 00
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
80: 01 8c 03 00 00 00 00 00 00 00 00 00 05 00 81 01
90: 0c f0 ef fe 00 00 00 00 a6 41 00 00 00 00 00 00
a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
e0: 00 00 00 00 00 00 00 00 00 00 01 00 10 00 10 80
f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

╭─root@Galactica /home/kostecki  
╰─➤  lspci -xxx -s 00:1f.3
00:1f.3 SMBus: Intel Corporation Atom processor C2000 PCU SMBus (rev 02)
00: 86 80 3c 1f 43 01 98 02 02 00 05 0c 00 00 00 00
10: 00 00 50 df 00 00 00 00 00 00 00 00 00 00 00 00
20: 01 e0 00 00 00 00 00 00 00 00 00 00 d9 15 20 08
30: 00 00 00 00 00 00 00 00 00 00 00 00 ff 02 00 00
40: 11 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
60: 03 04 04 00 00 00 08 08 00 00 00 00 00 00 00 00
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
80: 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
f0: 00 00 00 00 00 00 00 00 00 0f 02 01 03 03 03 00


> $ cat /proc/interrupts
 
See attachment.

> Also look for any message related to i2c, SMBus, i801 or the PCI devices
> above in the kernel logs.

╭─root@Galactica /
╰─➤  dmesg|grep -i smbus

[    7.968653] i801_smbus 0000:00:1f.3: enabling device (0140 -> 0143)
[    7.970338] i801_smbus 0000:00:1f.3: SMBus using PCI interrupt
[    7.974068] ismt_smbus 0000:00:13.0: enabling device (0140 -> 0142)
[  974.471917] ismt_smbus 0000:00:13.0: completion wait timed out
[  975.512022] ismt_smbus 0000:00:13.0: completion wait timed out
[  976.552097] ismt_smbus 0000:00:13.0: completion wait timed out
[  977.592124] ismt_smbus 0000:00:13.0: completion wait timed out
[  978.632168] ismt_smbus 0000:00:13.0: completion wait timed out
[  979.682207] ismt_smbus 0000:00:13.0: completion wait timed out
[  980.712251] ismt_smbus 0000:00:13.0: completion wait timed out
[  981.752310] ismt_smbus 0000:00:13.0: completion wait timed out

The timeout messages are only shown, when I do load jc42.
I am also attaching my whole dmesg.

Cheers
Conrad