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Bisect is pointing >> to this commit and reverting this on top of -next (along with reverting >> "serial: 8250: Revert "drop lockdep annotation from >> serial8250_clear_IER()") fixes the issue. So far I have not dug in any >> further. Unfortunately, I don't have any logs to see if there is some >> crash or something happening but I will see if there is any more info I >> can get. > > I have been looking into reproducing this using other 8250/ARM boards > (BeagleBone Black and Phytec WEGA). Unfortunately it is just showing me > all kinds of other brokenness (in mainline) and essentially making it > impossible to confirm that I am seeing what you are seeing, since > suspend/resume is randomly dying without my 8250-nbcon patch. > > Before I start spending weeks investigating/fixing most likely totally > unrelated PM or BSP issues, is it possible that I could receive one of > the boards you mentioned so that I can reproduce and debug the actual > problem you are reporting? If this is possible, feel free to take this > conversation offline so that we can discuss delivery details. Thanks! These boards are really old now and so I don't really have any that we can ship. It would be great to get this change merged as I see that it is needed for RT support. I could see if I can resurrect a Tegra124 Jetson TK1 and test again on that to see if we can get some logs. Thierry, do you have a Tegra124 Jetson TK1 handy to test this change on? Jon -- nvpublic