I believe this is the same as https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1853044 and possibly https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1856653.
lp:1853044 has test kernels for both 5.3 (https://people.canonical.com/~sforshee/lp1853044/5.3.0-40.32+lp1853044v202002131655/) and 5.4 (https://kernel.ubuntu.com/~arighi/LP-1853044/) containing a patch to fix this. I tried the 5.3 test kernel and powertop is now showing RC6 usage > 90% when my desktop is idle.
If this solves the problem for you, I'll duplicate this to lp:1853044.
I believe this is the same as https:/ /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/1853044 and possibly https:/ /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/1856653.
lp:1853044 has test kernels for both 5.3 (https:/ /people. canonical. com/~sforshee/ lp1853044/ 5.3.0-40. 32+lp1853044v20 2002131655/) and 5.4 (https:/ /kernel. ubuntu. com/~arighi/ LP-1853044/) containing a patch to fix this. I tried the 5.3 test kernel and powertop is now showing RC6 usage > 90% when my desktop is idle.
If this solves the problem for you, I'll duplicate this to lp:1853044.