Yes. It would appear that the fix/config change was not rolled into 5.4.0-33-generic. RT_GROUP_SCHED is still enabled in generic build but not lowlatency kernel build.
twiggy@twiggy:/ $ zgrep CONFIG_RT_GROUP_SCHED /boot/config-5.4.0-33-generic CONFIG_RT_GROUP_SCHED=y
twiggy@twiggy:/ $ zgrep CONFIG_RT_GROUP_SCHED /boot/config-5.4.0-33-lowlatency # CONFIG_RT_GROUP_SCHED is not set
I have no idea why... so still using lowlatency build here for now. ymmv!
Yes. It would appear that the fix/config change was not rolled into 5.4.0-33-generic. RT_GROUP_SCHED is still enabled in generic build but not lowlatency kernel build.
twiggy@twiggy:/ $ zgrep CONFIG_ RT_GROUP_ SCHED /boot/config- 5.4.0-33- generic RT_GROUP_ SCHED=y
CONFIG_
twiggy@twiggy:/ $ zgrep CONFIG_ RT_GROUP_ SCHED /boot/config- 5.4.0-33- lowlatency RT_GROUP_ SCHED is not set
# CONFIG_
I have no idea why... so still using lowlatency build here for now. ymmv!