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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hi Matthew, On 9/2/26 08:26, Matthew Bettencourt wrote: > Hello Guenter, > > Here is the i2cdump for those two 0x71 and 0x73 devices > > # i2cdump -y -f 12 0x73 b >      0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef > 00: ff ff ff ff XX ff 12 ff 12 ff ff ff XX XX XX XX    ....X.?.?...XXXX > 10: XX 0f XX XX XX XX XX XX XX XX XX XX XX XX XX XX    X?XXXXXXXXXXXXXX > 20: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX > 30: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX > 40: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX > 50: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX > 60: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX > 70: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX > 80: 00 e1 f9 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f    .??????????????? > 90: 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f    ???????????????? > a0: 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f    .??????????????? > b0: 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f    ???????????????? > c0: 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f    .??????????????? > d0: 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f    ???????????????? > e0: 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f    .??????????????? > f0: 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f    ???????????????? > # i2cdump -y -f 12 0x71 b >      0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef > 00: ff ff ff ff XX ff 57 ff 57 ff ff ff XX XX XX XX    ....X.W.W...XXXX > 10: XX 0f XX XX XX XX XX XX XX XX XX XX XX XX XX XX    X?XXXXXXXXXXXXXX > 20: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX > 30: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX > 40: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX > 50: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX > 60: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX > 70: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX > 80: 00 0b e0 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f    .??????????????? > 90: 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f    ???????????????? > a0: 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f    .??????????????? > b0: 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f    ???????????????? > c0: 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f    .??????????????? > d0: 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f    ???????????????? > e0: 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f    .??????????????? > f0: 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f    ???????????????? > I2C bus multiplexers only return a single data byte reflecting the currently selected bus. On writes they also accept a single byte, where a set bit indicates which of its channel(s) should be enabled. So i2cdump does not really work. Actually, using i2cdump might have messed it up because the writes involved might change the active bus... sorry, I should have mentioned before. In general it is not safe to use i2cdump on an unknown device. Worst case it can turn the hardware into a brick (seriously - I have seen that happen). You could try "i2cget 12 0x71" and "i2cget 12 0x73". That should return the active channel(s) if those are really I2C bus multiplexers. If they are, only a single bit should be set (again, i2cdump might have messed it up, so you might want to reboot). > # ls -l /sys/bus/i2c/devices/ > total 0 > lrwxrwxrwx. 1 root root 0 Sep  2 10:08 12-0051 -> ../../../devices/pci0000:00/0000:00:14.0/i2c-12/12-0051 > lrwxrwxrwx. 1 root root 0 Sep  2 10:08 12-0053 -> ../../../devices/pci0000:00/0000:00:14.0/i2c-12/12-0053 > lrwxrwxrwx. 1 root root 0 Sep  2 10:08 i2c-0 -> ../../../devices/platform/AMDI0010:00/i2c-0 > lrwxrwxrwx. 1 root root 0 Sep  2 10:08 i2c-1 -> ../../../devices/platform/AMDI0010:01/i2c-1 > lrwxrwxrwx. 1 root root 0 Sep  2 10:08 i2c-10 -> ../../../devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/drm/card1/card1-DP-2/i2c-10 > lrwxrwxrwx. 1 root root 0 Sep  2 10:08 i2c-11 -> ../../../devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/drm/card1/card1-DP-3/i2c-11 > lrwxrwxrwx. 1 root root 0 Sep  2 10:08 i2c-12 -> ../../../devices/pci0000:00/0000:00:14.0/i2c-12 > lrwxrwxrwx. 1 root root 0 Sep  2 10:08 i2c-13 -> ../../../devices/pci0000:00/0000:00:14.0/i2c-13 > lrwxrwxrwx. 1 root root 0 Sep  2 10:08 i2c-14 -> ../../../devices/pci0000:00/0000:00:14.0/i2c-14 > lrwxrwxrwx. 1 root root 0 Sep  2 10:08 i2c-2 -> ../../../devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/i2c-2 > lrwxrwxrwx. 1 root root 0 Sep  2 10:08 i2c-3 -> ../../../devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/i2c-3 > lrwxrwxrwx. 1 root root 0 Sep  2 10:08 i2c-4 -> ../../../devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/i2c-4 > lrwxrwxrwx. 1 root root 0 Sep  2 10:08 i2c-5 -> ../../../devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/i2c-5 > lrwxrwxrwx. 1 root root 0 Sep  2 10:08 i2c-6 -> ../../../devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/i2c-6 > lrwxrwxrwx. 1 root root 0 Sep  2 10:08 i2c-7 -> ../../../devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/i2c-7 > lrwxrwxrwx. 1 root root 0 Sep  2 10:08 i2c-8 -> ../../../devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/i2c-8 > lrwxrwxrwx. 1 root root 0 Sep  2 10:08 i2c-9 -> ../../../devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/drm/card1/card1-DP-1/i2c-9 > lrwxrwxrwx. 1 root root 0 Sep  2 10:08 i2c-MSFT8000:00 -> ../../../devices/platform/AMDI0010:01/i2c-1/i2c-MSFT8000:00 > > > If it is worth while I have access to second AMD machine, PRO B850M-A WIFI/7600x3d/Teamgroup 2x16GB - FLBD532G6000HC30DC01, which I can swap parts from/to. Even though its a completely different system it might worth it to swap parts out and see then what comes up on either system to help identify what might be going on with the i2c bus devices. > It might be worthwhile if that system does not suffer from the same problem. Bus-wise I can see that you seem to have different I2C busses in your system. I have lrwxrwxrwx 1 root root 0 Aug 29 16:26 0-0050 -> ../../../devices/pci0000:00/0000:00:14.0/i2c-0/0-0050 lrwxrwxrwx 1 root root 0 Aug 29 16:26 0-0051 -> ../../../devices/pci0000:00/0000:00:14.0/i2c-0/0-0051 lrwxrwxrwx 1 root root 0 Aug 29 16:26 0-0052 -> ../../../devices/pci0000:00/0000:00:14.0/i2c-0/0-0052 lrwxrwxrwx 1 root root 0 Aug 29 16:26 0-0053 -> ../../../devices/pci0000:00/0000:00:14.0/i2c-0/0-0053 lrwxrwxrwx 1 root root 0 Aug 29 16:26 i2c-0 -> ../../../devices/pci0000:00/0000:00:14.0/i2c-0 lrwxrwxrwx 1 root root 0 Aug 29 16:26 i2c-1 -> ../../../devices/pci0000:00/0000:00:14.0/i2c-1 lrwxrwxrwx 1 root root 0 Aug 29 16:26 i2c-2 -> ../../../devices/pci0000:00/0000:00:14.0/i2c-2 lrwxrwxrwx 1 root root 0 Aug 29 16:26 i2c-3 -> ../../../devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/i2c-3 lrwxrwxrwx 1 root root 0 Aug 29 16:26 i2c-4 -> ../../../devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/i2c-4 lrwxrwxrwx 1 root root 0 Aug 29 16:26 i2c-5 -> ../../../devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/i2c-5 lrwxrwxrwx 1 root root 0 Aug 29 16:26 i2c-6 -> ../../../devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/i2c-6 lrwxrwxrwx 1 root root 0 Aug 29 16:26 i2c-7 -> ../../../devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/drm/card1/card1-DP-1/i2c-7 so I don't have any of the AMDI0010 devices. Maybe that is the built-in GPU ? Thanks, Guenter