https://bugzilla.kernel.org/show_bug.cgi?id=216745
Bug ID: 216745
Summary: Kernel 6.1 breaks Thinkpad T14 Gen 2 AMD connection to
USB-C dock Gen 2 with kernel Null pointer
Product: Drivers
Version: 2.5
Kernel Version: 6.1.0-rc6
Hardware: AMD
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Video(DRI - non Intel)
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Created attachment 303299
--> https://bugzilla.kernel.org/attachment.cgi?id=303299&action=edit
journal output with DRM debug set to 0xf
Full description of the problem:
Connecting T14 Gen 2 AMD to Thinkpad USB C Dock Gen 2 via USB-C on DP Alt mode.
Since kernel 6.1.0-rc4 (and rc 5, rc 6), once the usb c cable is plug in, the
dock and computer detected the connection by blinking on both power buttons (on
laptop and dock), and then the laptop became completely unresponsive, has to be
powered off by long press on power button. Based on the journal output it looks
like something about DRM and AMDGPU, and Kernel null pointer (and oops
message).
Keywords:
DRM, AMDGPU
Most recent kernel version which did not have the bug:
Tried 5.19.17, 6.0.10 and it's working.
A journal output with DRM debug value set to 0xf is attached.
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