Ubuntu
ubuntu-drivers-common package

PRIME on demand mode uses the wrong GPU

Bug #1900137 reported by Alberto Milone on 2020-10-16

This bug affects 1 person

Affects		Status	Importance	Assigned to	Milestone
	ubuntu-drivers-common (Ubuntu)	Fix Released	High	Alberto Milone

Bug Description

If you selected "nvidia" (performance) mode in the past, selecting on-demand mode will not remove the xorg configuration file, and the NVIDIA GPU will remain the primary GPU (whereas the integrated GPU should be the primary one).

DISPLAY=:1 __NV_PRIME_RENDER_OFFLOAD=0 __GLX_VENDOR_LIBRARY_NAME="" glxinfo | grep renderer

OpenGL renderer string: Quadro T2000 with Max-Q Design/PCIe/SSE2

Alberto Milone (albertomilone) on 2020-10-16

Changed in ubuntu-drivers-common (Ubuntu):
importance:	Undecided → High

Revision history for this message

Alex Tu (alextu) wrote on 2020-10-19:

oemlogs-u-Precision-5550-20201019113812+0800.apport.gz Edit (3.5 MiB, application/octet-stream)

A verification result on a laptop with Nvidia GPU that supports runtime pm.
It looks good.

01:00.0 3D controller [0302]: NVIDIA Corporation TU117GLM [Quadro T2000 Mobile / Max-Q] [10de:1fb8] (rev a1)

the ubuntu-drivers-common was from:
- https://launchpad.net/~alextu/+archive/ubuntu/nvidia-drivers-testing/+sourcepub/11671516/+listing-archive-extra
- https://git.launchpad.net/~alextu/+git/ubuntu-drivers-common/commit/?id=32cc96ebb3aa82af5798ac426947c2e33400699f

nvidia-prime : 0.8.15
nvidia-driver-450 : 450.80.02-0ubuntu1

verified steps:

- ubuntu@u-Precision-5550:~$ DISPLAY=:0 __NV_PRIME_RENDER_OFFLOAD=1 __GLX_VENDOR_LIBRARY_NAME=nvidia glxinfo | pastebinit
https://paste.ubuntu.com/p/MXwVdc9Jn4/

- ubuntu@u-Precision-5550:~$ DISPLAY=:0 __NV_PRIME_RENDER_OFFLOAD=0 __GLX_VENDOR_LIBRARY_NAME="" glxinfo | pastebinit
https://paste.ubuntu.com/p/N4pSt3c4H6/

Revision history for this message

Launchpad Janitor (janitor) wrote on 2020-10-19:

This bug was fixed in the package ubuntu-drivers-common - 1:0.8.6.1

---------------
ubuntu-drivers-common (1:0.8.6.1) groovy; urgency=medium

  * UbuntuDrivers/detect.py:
    - Assume the NVIDIA packages to be non-free (LP: #1899630).
  * gpu-manager.{c|py}:
    - Handle the xorg conf file in all supported PRIME
      scenarios (LP: #1900137).
  * tests/test_ubuntu_drivers.py,
    tests/gpu-manager.py:
    - Expect a xorg conf file to be created in on-demand
      mode (11-nvidia-offload.conf) in the test suite.
    - Fix test cases now that nvidia is marked as non-free.