I’m trying to debug via a serial console a suspend problem I’m having with kernel 5.15 (not with 5.14.x) on F35
with 5.14 suspend shuts the box off as usual.
with 5.15 suspend hangs the box hard; no ping. only a hard reset gets it to live again
the serial console is running.
I can login to the box I want to debug and see the boot messages.
But what I can’t see/log is all what the kernel does after I type
I’m still not sure about the serial console settings, but the cause of unable to suspend with 5.15.y seems to be the Wifi/BT driver (Intel(R) Wi-Fi 6 AX201 160MHz, REV=0x354)
AFAIK, there isn’t even a 5.16-rc1 from kernel.org (might released tonight though), while for rawhide there is a *-rc0.
Anyway that kernels (might) contain(s) a lot of bugs in that early state…
the problem I’m having seems to be a regression from 5.14 and might hit more people when Fedora 35 jumps to kernel 5.15, so it should be investigated/fixed before.
therefore I/one need to provide some nice debug log’s so the developer could know where to look at. My vague bet is: it’s around PCIe …
AFAIK, best to get debug log’s is via serial console so I need to get that correct working before