Public bug reported:
[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.
** Affects: hwe-next
Importance: Undecided
Status: New
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: AceLan Kao (acelankao)
Status: In Progress
** Tags: originate-from-1777105 somerville
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https://bugs.launchpad.net/bugs/1778658
Title:
Nvidia fails after switching its mode
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