Ubuntu
linux package

  1. Bug #1988346
  2. Comment #24

Comment 24 for bug 1988346

Revision history for this message
Niall Murphy (nmurphy) wrote :

The previous Kernel I used was 5.4.0-81-generic on ubuntu 20.04.
Grepping through /var/log there is no mention of cm32181 before the upgrade data (August 19th).

After the upgrade to 5.15.0-47-generic and Ubuntu 22.04 the "cm32181 i2c-CPLM3218:00: PM: failed to suspend: error -121" appears.
These errors continue with 5.15.0-48-generic

If I run
```bash
while true; do cat /sys/devices/pci0000:00/INT33C3:00/i2c-0/i2c-CPLM3218:00/iio:device0/in_illuminance_input; sleep 0.1; done
```
it returns 0, then if i shine a torch at the top left corner of the screen it registers different numbers, the max I saw was 500.

If I suspend the laptop, the suspend will fail.
After the failed suspend I can still run the above cat command and get a brightness readout.

Is there any other debugging I can do to help figure out what is wrong?
Perhaps I just need to tell the suspend system to ignore i2c?