Public bug reported:
[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.
[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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux-oem-5.17 (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux-oem-6.0 (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Jammy)
Importance: Undecided
Status: Invalid
** Affects: linux-oem-5.17 (Ubuntu Jammy)
Importance: Undecided
Status: New
** Affects: linux-oem-6.0 (Ubuntu Jammy)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Kinetic)
Importance: Undecided
Status: Invalid
** Affects: linux-oem-5.17 (Ubuntu Kinetic)
Importance: Undecided
Status: New
** Affects: linux-oem-6.0 (Ubuntu Kinetic)
Importance: Undecided
Status: New
** Also affects: linux-oem-5.17 (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Jammy)
Importance: Undecided
Status: New
** Also affects: linux-oem-5.17 (Ubuntu Jammy)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Kinetic)
Importance: Undecided
Status: New
** Also affects: linux-oem-5.17 (Ubuntu Kinetic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Jammy)
Status: New => Invalid
** Changed in: linux (Ubuntu Kinetic)
Status: New => Invalid
** Also affects: linux-oem-6.0 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1991366
Title:
Fix Thunderbolt device hotplug fail when connect via thunderbolt dock
Status in linux package in Ubuntu:
Invalid
Status in linux-oem-5.17 package in Ubuntu:
New
Status in linux-oem-6.0 package in Ubuntu:
New
Status in linux source package in Jammy:
Invalid
Status in linux-oem-5.17 source package in Jammy:
New
Status in linux-oem-6.0 source package in Jammy:
New
Status in linux source package in Kinetic:
Invalid
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.
[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.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1991366/+subscriptions
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