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apport-collect 1874933
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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1874933
Title:
Performance workaround for Dell 7390 2-in-1 Ice Lake
Status in linux package in Ubuntu:
Incomplete
Bug description:
As reported here:
https://www.phoronix.com/forums/forum/linux-graphics-x-org-drivers/intel-linux/1174225-dell-xps-7390-intel-ice-lake-performance-hit-hard-by-a-linux-kernel-regression?view=stream
This primarily impacts "Ubuntu 20.04 LTS (Focal Fossa)." as it switched to
5.4 kernel.
The 5.4 kernel added support for "Processor thermal device", for Ice Lake,
which will expose the power tables (via PPCC).
This system default "max RAPL long term power limit" is 15W. But this
power table is specifying as 9W. So thermald will limit power to 9W.
If dptfxtract is executed, then power limit will be higher than power
up value, but most of the users will use out of the box setup. So this
need a workaround.
This workaround will ignore any power limit less than the power up
power limit.
This is addressed in thermald 2.1 with two commits:
https://github.com/intel/thermal_daemon/commit/f7db434293387c965e8d9141608f855893740e3a
https://github.com/intel/thermal_daemon/commit/c3461690eafb7304bf59a39fb02955a5154b3861
I know 20.04 LTS uses 1.9.1. I can assist in backport if required.
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