** Also affects: linux (Ubuntu Kinetic)
Importance: Undecided
Status: New
** Also affects: linux-oem-5.17 (Ubuntu Kinetic)
Importance: Undecided
Status: New
** Also affects: linux-oem-6.0 (Ubuntu Kinetic)
Importance: Undecided
Status: New
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Packages, which is subscribed to linux-oem-5.17 in Ubuntu.
https://bugs.launchpad.net/bugs/1991366
Title:
Fix Thunderbolt device hotplug fail when connect via thunderbolt dock
Status in HWE Next:
New
Status in linux package in Ubuntu:
Triaged
Status in linux-oem-5.17 package in Ubuntu:
Invalid
Status in linux-oem-6.0 package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Fix Committed
Status in linux-oem-5.17 source package in Jammy:
Fix Released
Status in linux-oem-6.0 source package in Jammy:
Fix Released
Status in linux source package in Kinetic:
New
Status in linux-oem-5.17 source package in Kinetic:
New
Status in linux-oem-6.0 source package in Kinetic:
New
Bug description:
[SRU Justification]
[Impact]
Some Dell laptops where booting with Thunderbolt/USB4 devices connected the
BIOS leaves some of
the PCIe devices unconfigured. The kernel message shows "No bus number
available for hot-added bridge". The connected devices can't be found.
[Fix]
Current linux PCI distribute the "spare" resources between hotplug ports on
hot-add but have not done that upon the initial scan. The patches make the
initial root bus scan path to do the same. The additional patches are just a
small cleanups that can be applied separately too.
[Test]
1. Power on the machine with Thunderbolt/USB4 devices connected.
2. Check the kernel message to see if "No bus number available for hot-added
bridge" shows up or not.
3. Check if the Thunderbolt/USB4 devices works or not.
[Where problems could occur]
The patches only apply the same procedures on initial root bus scan which was
not done. If the BIOS configures the PCI correctly, everything is OK. It only
takes effect for the BIOS w/ unconfigured PCIe devices.
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