Public bug reported:
[Impact]
After CB/WB, Thunderbolt monitor can't be recognized.
The root cause is that the igc driver gets the error from NIC (provided
by K2 dock) while performing NVM read IO. The driver lacks the mechanism
to report the error and further runs the codes afterwards, which causes
the unexpected 40~ sec. sleep and affected the Thunderbolt.
[Fix]
Cherry-pick the following patch from linux-next fixes the issue:
bd2776e39c2a igc: return early when failing to read EECD register
[Test Plan]
1. Install Ubuntu image and boot into the OS
2. Connect TBT monitor to SUT via K2 dock
3. Check if the monitor is working
[Where problems could occur]
May cause regression regarding some cases which were false positive beforehand.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux-oem-6.11 (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Noble)
Importance: Undecided
Status: Invalid
** Affects: linux-oem-6.11 (Ubuntu Noble)
Importance: Undecided
Assignee: En-Wei Wu (rickywu)
Status: New
** Also affects: linux-oem-6.11 (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Noble)
Importance: Undecided
Status: New
** Also affects: linux-oem-6.11 (Ubuntu Noble)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Noble)
Status: New => Invalid
** Changed in: linux-oem-6.11 (Ubuntu Noble)
Assignee: (unassigned) => En-Wei Wu (rickywu)
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https://bugs.launchpad.net/bugs/2094759
Title:
TBT monitor can't be recognized after CB/WB SUT while connected
SD25TB5/WD25TB5 dock
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