** Description changed: ===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 + 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.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1789358 Title: Support Power Management for Thunderbolt Controller To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1789358/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
