This bug was fixed in the package nvidia-prime - 0.8.8.2
---------------
nvidia-prime (0.8.8.2) bionic; urgency=medium
* prime-switch:
- Give udev the time to add the drm device. Fixes a race
condition that causes problems when using lightdm and
sddm (LP: #1797147).
-- Alberto Milone <alberto.mil...@canonical.com> Wed, 10 Oct 2018
17:59:03 +0200
--
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to nvidia-prime in Ubuntu.
https://bugs.launchpad.net/bugs/1797147
Title:
Backport PRIME switching fixes to Ubuntu 18.04
Status in nvidia-prime package in Ubuntu:
Fix Released
Status in ubuntu-drivers-common package in Ubuntu:
Fix Released
Status in nvidia-prime source package in Bionic:
Fix Released
Status in ubuntu-drivers-common source package in Bionic:
Fix Released
Bug description:
SRU Request:
[Impact]
A recent update (LP: #1778011) in 18.04 has restored the PRIME switching
mechanism in Gdm 3 only, while still leaving out support for other login
managers (such as Lightdm, and SDDM).
In addition to this, we should restore the default pci power control
profile for the dGPU when re-enabling performance mode, as we do in
Ubuntu 18.10.
[Test Case]
1) Make sure that you are using a login manager such as Lightdm or SDDM.
2) Enable the bionic-proposed repository, and install the new "ubuntu-
drivers-common", and the new nvidia-prime.
3) Make sure the nvidia packages are installed and working, and enable power
saving mode:
sudo prime-select intel
4) Log out, log back in, and check that the nvidia kernel module is not
loaded:
lsmod | grep nvidia
5) Select performance mode:
sudo prime-select nvidia
6) Log out, and log back in
7) Check if the nvidia driver loaded:
lsmod | grep nvidia
[Regression Potential]
Low, as switching already fails in 18.04, since X is started before udev adds
back the dGPU.
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https://bugs.launchpad.net/ubuntu/+source/nvidia-prime/+bug/1797147/+subscriptions
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