Power limits from this platform: abuser@labuser-XPS-13-7390-2-in-1:/$ grep -r . sys/bus/pci/devices/0000\:00\:04.0/power_limits/* sys/bus/pci/devices/0000:00:04.0/power_limits/power_limit_0_max_uw:9000000 sys/bus/pci/devices/0000:00:04.0/power_limits/power_limit_0_min_uw:2500000 sys/bus/pci/devices/0000:00:04.0/power_limits/power_limit_0_step_uw:100000 sys/bus/pci/devices/0000:00:04.0/power_limits/power_limit_0_tmax_us:28000000 sys/bus/pci/devices/0000:00:04.0/power_limits/power_limit_0_tmin_us:24000000 sys/bus/pci/devices/0000:00:04.0/power_limits/power_limit_1_max_uw:15000000 sys/bus/pci/devices/0000:00:04.0/power_limits/power_limit_1_min_uw:6000000 sys/bus/pci/devices/0000:00:04.0/power_limits/power_limit_1_step_uw:100000 sys/bus/pci/devices/0000:00:04.0/power_limits/power_limit_1_tmax_us:28000000 sys/bus/pci/devices/0000:00:04.0/power_limits/power_limit_1_tmin_us:24000000
You can see 9000000 as max power limit 0. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1874933/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
