intel grafic i915 driver no power saving states rc6

powertop:
Take care, maybe you have to scroll down, it is in the middle row below the cpu-cores
For some strange reason also the packet (summery?) shows in all states 0%, although I can observe the individual CPU cores are in different power states.

Edit:
I observed that with Ubuntu Mate 18.04 with new (!) installations. My old installation (kernel 4.15 seems not to be updated to newer version) is not suffered. I have tested also Linux Mint 19.3. Initially (kernel 5.0 if I remember right works) but after update to 5.3 not anymore. So I can exclude hardware as an issue.

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I am off from my testobject for a few days - will at this later.

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 am pretty sure, that these mentioned bugs are same issue. Thanks.
I found this enable_rc6 has been removed due to stability issues.
Do you think Ubuntu will backport the fix?

Kernel 5.3.0.18 is not affected, but the following versions.

> Do you think Ubuntu will backport the fix?

Yes, looks like the backport to 5.3 is in progress: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1853044/comments/32