Also seen on Archlinux:

Per their comment, my output:

oem@ubuntu:~$ cat /sys/module/i915/parameters/enable_psr
cat: /sys/module/i915/parameters/enable_psr: Permission denied
oem@ubuntu:~$ sudo cat /sys/module/i915/parameters/enable_psr
[sudo] password for oem: 

So returns '0' , but 'cat' usually does not needs 'sudo' . Looks

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  kernel: [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update
  failure on pipe A

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