** Changed in: linux (Ubuntu Bionic)
Status: Triaged => In Progress
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https://bugs.launchpad.net/bugs/1778658
Title:
Nvidia fails after switching its mode
Status in HWE Next:
Triaged
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Bionic:
In Progress
Bug description:
[Impact]
Switch Nvidia mode requires rebooting the system. It's because of losing some
of its status while switching mode if runtime PM is enabled. It's a generic
issue that would happen on some other devices, too. This patch restores
devices' config space on runtime resume.
[Test]
Test and verify it on machines with Nvidia discrete graphics.
[Fix]
Fix by saving and restoring config space over a runtime suspend cycle even if
the device is not bound.
[Regression Potential]
Low. It saves and restores states during suspending and resuming.
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