Support Power Management for Thunderbolt Controller
Bug #1789358 reported by
Kai-Heng Feng
This bug affects 1 person
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
HWE Next |
Fix Released
|
Undecided
|
Unassigned | ||
linux (Ubuntu) |
Fix Released
|
Undecided
|
Unassigned | ||
Bionic |
Fix Released
|
Undecided
|
Unassigned | ||
Cosmic |
Fix Released
|
Undecided
|
Unassigned |
Bug Description
===SRU Justification===
[Impact]
New TBT controllers may use Native PCIe Enumeration (i.e. just like
other normal PCIe device listed under lspci) instead of ACPI hotplug.
Since TBT controller stops getting unplugged from PCIe bus, it draws
additional power.
[Fix]
Support runtime power management for TBT controllers, so it can be put
to D3 to save powers.
[Test]
I tested and verified this patch series can make Lenovo T480's TBT
controller enters PCI D3 at runtime.
I also verified this series on XPS 9370 which uses ACPI hotplug, no regression observed.
[Regression Potential]
Low. Almost all TBT controllers in the wild still uses ACPI hotplug,
this series won't affect those users.
CVE References
tags: | added: originate-from-1781335 somerville |
Changed in linux (Ubuntu): | |
status: | Incomplete → In Progress |
Changed in hwe-next: | |
status: | New → Triaged |
description: | updated |
Changed in linux (Ubuntu Cosmic): | |
status: | In Progress → Fix Committed |
Changed in linux (Ubuntu Bionic): | |
status: | New → In Progress |
Changed in linux (Ubuntu Bionic): | |
status: | In Progress → Fix Committed |
Changed in hwe-next: | |
status: | Triaged → Fix Released |
tags: | added: cscc |
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This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 1789358
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the Ubuntu Kernel Team.