(In reply to Mario Limonciello (AMD) from comment #101) > Those of you that can still reproduce this, does reverting > https://github.com/torvalds/linux/commit/ > 4dbd11796f3a8eb95647507befc41995458a4023 change anything? That commit is > correct so we wouldn't revert it in mainline, but it might give a hint that > there are multiple timing problems. > > Please give it a solid shake out (at least 10 cycles that you unplug power > adapter during suspend) before reporting back.
An update that might warrant some investigation. I updated to the latest HP BIOS, which is: Version: V82 Ver. 01.09.02 Release Date: 08/04/2025 I thought I'd see if the new BIOS fixed anything, but I was able to get stuck in the low power mode pretty easily so I figured nothing changed on this front. However, I found steps where I can consistently get into low power mode and get out of it without a reboot. Here are the components in play: HP Elitebook 845 G10 - 7840U HP 65W USB C charger Dell WD19TB Thunderbolt Dock Here are the steps: 1) Laptop in use plugged into WD19TB (normal performance) 2) Unplug USB-C cable from dock 3) Close lid of laptop 4) Plug in HP 65W charger 5) Wait a few seconds 6) Unplug HP charger 7) Open Laptop - See that the CPU is stuck in low power mode 8) Plug laptop into Dell dock - CPU is no longer stuck in low power mode Now if I return to step 3 and follow the steps, in step 7 the CPU will be in low power mode consistently. It seems plugging into the dock resets the low power mode. I'm not sure if any of this info helps. I'd be happy to run the scripts to capture logs tomorrow, but I thought this data might be useful -- 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/2088733 Title: low CPU frequency after wake up AMD Ryzen Status in Linux: Invalid Status in linux package in Ubuntu: Confirmed Bug description: After wake up I can see at least once a week issue with CPU frequency not going up. When running: $ watch lscpu -e=CPU,MHZ standard output looks like: CPU MHZ 0 400.0000 1 1383.2480 2 400.0000 3 400.0000 4 400.0000 5 2699.7561 6 1288.0500 7 400.0000 8 400.0000 9 400.0000 10 400.0000 11 400.0000 12 3244.0720 13 400.0000 14 400.0000 15 1295.9050 while when the issue occurs, I can't see 600 Mhz or higher values in the same graph. Which also means that response time of computer is much lower and everything feels lazy. Restart fixes the issue or plug power cable off and in again. My CPU is AMD Ryzen™ 7 PRO 7840HS w/ Radeon™ 780M Graphics × 16 My kernel version: 6.8.0-48-generic #48-Ubuntu SMP PREEMPT_DYNAMIC Fri Sep 27 14:04:52 UTC 2024 OS version: Ubuntu 24.04.1 LTS My laptop: HP ZBook Firefly 14 inch G10 A Mobile Workstation PC I know about one more person with same machine type with the issue and there is also this question on askubuntu which says there is third person with this issue. https://askubuntu.com/questions/1531956/cpu-too-slow-after-waking-up- in-ubuntu-24-04-1 This bug looks pretty similar however should be fixed already, so creating new one https://bugs.launchpad.net/ubuntu/+source/linux-hwe-5.19/+bug/2007718 To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/2088733/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
