I can reproduce what appears to be the same issue on a different HP AMD laptop.
Hardware and software: * HP ZBook Power 16 inch G11 A Mobile Workstation PC * Product number: 9A818AV * AMD Ryzen 9 PRO 8945HS with Radeon 780M Graphics * BIOS: W85 Ver. 01.10.05 * Embedded-controller firmware: 8.82 * Ubuntu 24.04.4 LTS * Current kernel: Ubuntu 7.0.0-28-generic * Also observed with Ubuntu 6.17.0-35-generic * amd-pstate active / amd-pstate-epp The issue occurs when the AC adapter state changes while the laptop is fully suspended. Confirmed reproduction: 1. Suspend while connected to AC. 2. Wait until the laptop has fully entered suspend. 3. Disconnect AC while it is suspended. 4. Resume on battery. 5. All 16 logical CPUs may remain fixed at approximately 544 MHz, even under full CPU load. The reverse sequence has also been observed: 1. Suspend while running on battery. 2. Connect AC while fully suspended. 3. Resume while connected to AC. 4. The CPUs may again remain fixed at approximately 544 MHz. Changing powerprofilesctl between balanced and performance does not help. When affected, Linux still reports: * scaling_max_freq: approximately 5.263 GHz * cpuinfo_max_freq: approximately 5.263 GHz * CPU boost: enabled * amd-pstate status: active Briefly changing the AC adapter state again after resume immediately restores normal frequency scaling. Under the same 16-thread load, the CPU then reaches approximately 4.39 GHz. Ubuntu downstream report: Launchpad Bug #2162127 I have attached a combined log containing the CPU state before and after the recovery AC event, the cpufreq limits, and the relevant udev power- supply events. The complete before/after evidence is attached to Ubuntu Launchpad Bug #2162127. Key results from the attachment: * Before the recovery AC event, all 16 logical CPUs remain at approximately 544 MHz under full load. * After briefly changing the AC adapter state, the same test reaches approximately 4.39 GHz. * `scaling_max_freq` and `cpuinfo_max_freq` remain approximately 5.263 GHz in both states. * AMD P-State remains active, CPU boost remains enabled, and the power and platform profiles remain balanced. * The recovery event is detected normally as `POWER_SUPPLY_ONLINE=1`; after disconnecting AC again, the system returns to `POWER_SUPPLY_ONLINE=0` and battery discharging, while normal CPU performance remains restored. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2088733 Title: low CPU frequency after wake up AMD Ryzen To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/2088733/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
