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Bug#1140892: thunderbolt: Intel Goshen Ridge CL state regression breaks dock tunneling since 6.12.94

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On Mon, Jun 29, 2026 at 12:51:27AM +0200, noantwort@tuta.io wrote:
> Sorry for the trouble, I was wrong.
> 
> I incorrectly diagnosed this as a kernel regression introduced in 6.12.94, problem is in the dock itself.
> 
> The "failed to enable CL states" / "failed to enable TMU" / "PCIe tunnel activation failed" messages were a SYMPTOM of the dock's internal tunnel/routing state being stuck after repeated failed
> re-attach attempts, not the root cause. The actual fix was the cold power-cycle.
> (An earlier workaround, thunderbolt.clx=0, appeared to help, but it was the power-cycle and not the kernel parameter that restored function. clx=0 is not required.)
> 
> The kernel was upgraded 6.12.90-2 -> 6.12.94-1 via a package update. A new kernel only takes effect on reboot, so the dock kept working until the next reboot. The trigger was the reboot after
> the kernel install, not the kernel code. 
> 
> The dock does not reliably re-attach across a warm reboot and needs a coldpower-cycle to reset.
> Also, I reverted to the kernel 6.12.90 and then back to 6.12.94 and it keeps working in both directions.
> (In normal day-to-day use this has occurred three times in a row following a kernel update, yet when I deliberately try to reproduce it, the dock works fine)
> 
> Sorry again

Thanks a lot for reporting back.

I'm leaning towards closing then this bugreport assuming it is solely
an issue with the Dock. But I will wait until having discussed it with
other members in the kernel team.

Regards,
Salvatore

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Thread

Bug#1140892: thunderbolt: Intel Goshen Ridge CL state regression breaks dock tunneling since 6.12.94 dado <noantwort@tuta.io> - 2026-06-28 02:50 +0200
  Processed: Re: Bug#1140892: thunderbolt: Intel Goshen Ridge CL  state regression breaks dock tunneling since 6.12.94 "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-06-28 21:10 +0200
  Bug#1140892: thunderbolt: Intel Goshen Ridge CL state regression breaks dock tunneling since 6.12.94 Salvatore Bonaccorso <carnil@debian.org> - 2026-06-28 21:10 +0200
    Bug#1140892: thunderbolt: Intel Goshen Ridge CL state regression breaks dock tunneling since 6.12.94 noantwort@tuta.io - 2026-06-29 01:10 +0200
      Bug#1140892: thunderbolt: Intel Goshen Ridge CL state regression breaks dock tunneling since 6.12.94 Salvatore Bonaccorso <carnil@debian.org> - 2026-06-29 07:00 +0200
  Processed: Re: Bug#1140892: thunderbolt: Intel Goshen Ridge CL  state regression breaks dock tunneling since 6.12.94 "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-06-29 07:00 +0200
  Bug#1140892: thunderbolt: Intel Goshen Ridge CL state regression breaks dock tunneling since 6.12.94 Emmanuel Arias <eamanu@debian.org> - 2026-07-08 14:20 +0200
    Bug#1140892: thunderbolt: Intel Goshen Ridge CL state regression breaks dock tunneling since 6.12.94 noantwort@tuta.io - 2026-07-09 20:30 +0200
  Bug#1140892: marked as done (thunderbolt: Intel Goshen Ridge CL  state regression breaks dock tunneling since 6.12.94) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-07-22 19:10 +0200

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