[Bug 2142298] [NEW] [FFe] Add ability to change UMA carveout BIOS setting

Mario Limonciello 2142298 at bugs.launchpad.net
Fri Feb 20 13:25:12 UTC 2026


Public bug reported:

A new feature coming to kernel 7.0 is the ability to change the amount
of UMA carveout on AMD systems that is programmed in the BIOS.

https://docs.kernel.org/next/gpu/amdgpu/driver-misc.html#uma-carveout

This feature requires a privileged process to write the value.  To wrap
up the interface with policy kit it is being brought into fwupd.

https://github.com/fwupd/fwupd/pull/9925

I'm still working on the code review upstream, but I'm expecting we can
merge this upstream and bring it to the stable branch that Ubuntu 26.04
tracks.

** Affects: fwupd (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2142298

Title:
  [FFe] Add ability to change UMA carveout BIOS setting

Status in fwupd package in Ubuntu:
  New

Bug description:
  A new feature coming to kernel 7.0 is the ability to change the amount
  of UMA carveout on AMD systems that is programmed in the BIOS.

  https://docs.kernel.org/next/gpu/amdgpu/driver-misc.html#uma-carveout

  This feature requires a privileged process to write the value.  To
  wrap up the interface with policy kit it is being brought into fwupd.

  https://github.com/fwupd/fwupd/pull/9925

  I'm still working on the code review upstream, but I'm expecting we
  can merge this upstream and bring it to the stable branch that Ubuntu
  26.04 tracks.

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