USB4 DP tunneling fix for 6.0.y/5.15.y

"Limonciello, Mario" <Mario.Limonciello@xxxxxxx> · Thu, 10 Nov 2022 15:36:30 +0000

[Public]

Hi,

USB4 DP tunneling has a bug in 6.0.y and 5.15.y that was fixed in 6.1.
Basically if the Pre-OS connection manager has set up USB4 DP tunnels they're ignored by the OS so you'll have a "working" display in firmware and once the Linux kernel boots up you use lose the display.
Hot plugging works around the issue.

For 6.0.y can you please take this commit to fix it:
b60e31bf18a7 ("thunderbolt: Add DP OUT resource when DP tunnel is discovered")

For 5.15.y can you please take these two commits to fix it:
43bddb26e20a ("thunderbolt: Tear down existing tunnels when resuming from hibernate")
b60e31bf18a7 ("thunderbolt: Add DP OUT resource when DP tunnel is discovered")

Thanks,