SRU: https://lists.ubuntu.com/archives/kernel-
team/2021-March/117863.html (oem-5.10/unstable)
** Description changed:
+ [SRU Justification]
+
+ [Impact]
+
+ Systems with Intel Maple Ridge addon card with tbt devices attached may
+ fail to suspend/resume.
+
+ [Fix]
+
+ Commit 319696aa80 ("xhci: Fix repeated xhci wake after suspend due to
+ uncleared internal wake state") currently landed in
+ https://git.kernel.org/pub/scm/linux/kernel/git/mnyman/xhci.git branch
+ for-usb-linus.
+
+ [Test Case]
+
+ When booted from unpatched kernel, starting from oem-5.10 that has
+ received Intel Maple Ridge enablement fixes, XHCI port on Maple Ridge
+ card may wake itself unsolicitedly when performing runtime/deep suspend:
+
+ kernel: [326] pci_pme_active:2422: xhci_hcd 0000:37:00.0: PME# disabled
+ kernel: [326] __pci_set_master:4219: xhci_hcd 0000:37:00.0: enabling bus
mastering
+ kernel: [326] pci_save_state:1553: xhci_hcd 0000:37:00.0: saving config
space at offset 0x0 (reading 0x11388086)
+ ...
+ kernel: [326] pci_pme_active:2422: xhci_hcd 0000:37:00.0: PME# enabled
+
+ The suspend resume process will stuck forever.
+
+ [Where problems could occur]
+
+ Tried on a few more platforms, didn't found possible regression.
+
+ ========== original bug description ==========
+
[Reproduce Steps]
1. install TBT4 card
2. Boot into Ubuntu X68
3. suspend and wake up to confirm S3 function
3. Connect TBT storage
4. suspend
5. system cannot enter S3
[Results]
Expected Result: system enters suspend
Actual Result: 1st attempt fails, screen will be turned off but power & fan
won't. system can only enter s3 afterwards
Upstream bug: https://bugzilla.kernel.org/show_bug.cgi?id=211377
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https://bugs.launchpad.net/bugs/1916467
Title:
[Intel Maple Ridge] system cannot enter S3 the first time while
connecting to TBT4 storage
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