debcrafters-packages team mailing list archive

[Kai-Chuan Hsieh <2115041@xxxxxxxxxxxxxxxxxx>]

** Description changed:

  [ Impact ]
- 
-  * The AMD and Intel pstate driver will change CPU frequency control
- mechanism against different power mode setting in the PPD. To support
- the mechanism fully it needs to adapt correct thermal management policy
- in the BIOS which is determined by the USTT(User Selectable Thermal
- Table), and it is reflected by the platform profile. The feature will
- change the ThermalManagement setting after reboot when user change the
- power mode setting.
  
   * The thermal management policy may impacts cooling device operation
  like fan, for example, it can keep the fan speed high when user select
  performance in case a throttling happened. Without the change, it won't
  change the fan mode, so that the fan speed might be limited for not
  being so noisy, however, the real outcome depends on the platform design
- (some platforms may not have fan).
+ (some platforms may not have fan). In conclusion, the new AMD platform
+ is less likely being throttled with the change.
  
  The mapping relationship power mode and platform profiles:
  performance <-> performance
  balanced <-> balanced/balanced_performance/cool
  power saver <-> low-power/quiet
  
  [ Test Plan ]
  
   * On AMD Strix Point/Krackan Point platform which has sysfs node
  /sys/firmware/acpi/platform_profile
  
   * Try to modify power mode by $ sudo powerprofilectl set <power-mode>
  
   * Check if /sys/firmware/acpi/platform_profile being updated
  
   * After reboot, check if BIOS update the ThermalManagement setting by $
  fwupdmgr get-bios-setting ThermalManagement
  
  [ Where problems could occur ]
  
   * The platform will list supported platform_profile in
  /sys/firmware/acpi/platform_profile_choices, the DPP power mode should
  map to one of it, otherwise, it can't select the correct thermal policy.
  If the platform set the unexpected string which the mapping is not
  defined in the PPD. The thermal policy can't be switched successfully.
  
  [ Other Info ]
  
   * Upstream commit: https://gitlab.freedesktop.org/upower/power-
  profiles-daemon/-/commit/6b565b0b05a2bc92e3c546a567b394f415937265
  
   * The patch is in 25.04 and 25.10 already.
  
   * To the kernel without platform_profile node [1], the user experience
  is just as before.
  
  [1] https://docs.kernel.org/userspace-api/sysfs-platform_profile.html

-- 
You received this bug notification because you are a member of
Debcrafters packages, which is subscribed to power-profiles-daemon in
Ubuntu.
https://bugs.launchpad.net/bugs/2115041

Title:
  Can't recognize custom ACPI platform profile

Status in OEM Priority Project:
  New
Status in power-profiles-daemon package in Ubuntu:
  In Progress

Bug description:
  [ Impact ]

   * The thermal management policy may impacts cooling device operation
  like fan, for example, it can keep the fan speed high when user select
  performance in case a throttling happened. Without the change, it
  won't change the fan mode, so that the fan speed might be limited for
  not being so noisy, however, the real outcome depends on the platform
  design (some platforms may not have fan). In conclusion, the new AMD
  platform is less likely being throttled with the change.

  The mapping relationship power mode and platform profiles:
  performance <-> performance
  balanced <-> balanced/balanced_performance/cool
  power saver <-> low-power/quiet

  [ Test Plan ]

   * On AMD Strix Point/Krackan Point platform which has sysfs node
  /sys/firmware/acpi/platform_profile

   * Try to modify power mode by $ sudo powerprofilectl set <power-mode>

   * Check if /sys/firmware/acpi/platform_profile being updated

   * After reboot, check if BIOS update the ThermalManagement setting by
  $ fwupdmgr get-bios-setting ThermalManagement

  [ Where problems could occur ]

   * The platform will list supported platform_profile in
  /sys/firmware/acpi/platform_profile_choices, the DPP power mode should
  map to one of it, otherwise, it can't select the correct thermal
  policy. If the platform set the unexpected string which the mapping is
  not defined in the PPD. The thermal policy can't be switched
  successfully.

  [ Other Info ]

   * Upstream commit: https://gitlab.freedesktop.org/upower/power-
  profiles-daemon/-/commit/6b565b0b05a2bc92e3c546a567b394f415937265

   * The patch is in 25.04 and 25.10 already.

   * To the kernel without platform_profile node [1], the user
  experience is just as before.

  [1] https://docs.kernel.org/userspace-api/sysfs-platform_profile.html

To manage notifications about this bug go to:
https://bugs.launchpad.net/oem-priority/+bug/2115041/+subscriptions