https://bugs.freedesktop.org/show_bug.cgi?id=105190
arkadiusz.hiler@intel.com arkadiusz.hiler@intel.com changed:
What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |NOTABUG Status|NEW |RESOLVED
--- Comment #8 from arkadiusz.hiler@intel.com arkadiusz.hiler@intel.com --- Looks like it's caused by Fedora's customization. They picked up kernel lockdown series https://lwn.net/Articles/723653/
If the system is booted using secure boot it puts the kernel in lockdown mode, which includes disabling all the DebugFSes.
To enable it you have to lift the lockdown:
# sysctl kernel.sysrq=1 <Alt-PrtSc-x> on a physical keyboard; writing to /proc/sysrq-trigger does not work [ 137.276888] sysrq: SysRq : Disabling Secure Boot restrictions [ 137.276963] Lifting lockdown