Created attachment 120876 [details]
dmesg showing warning
Kernel log shows that a WARN_ON is triggered when the monitor is switched off
Can you see if this commit helps any?
That seems to fix the issue.
This has been fixed by the commit pointed by Ben. Please reopen if you still get the issue. Thanks for reporting this.
*** This bug has been marked as a duplicate of bug 92307 ***
*** Bug 94373 has been marked as a duplicate of this bug. ***