Thinkpad T22 - X.org/GDM freeze GPU when docked (Flight 6 +)
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
Ubuntu |
Invalid
|
Medium
|
Unassigned |
Bug Description
It'd be tempting to file this under xserver-
Undocked, the T22 boots fine, framebuffer works, and gdm generally loads, initializes the display, and life is good.
Attached to a Dock II, IBM type 2631, with or without hardware in the dock's PCI slot, the framebuffer works, but the display wedges with a frozen (text console) cursor when gdm runs.
Sometimes gdmplay can be heard working, consoles can be switched blind, and a clean shutdown -r can be performed. In this case, the GPU is left in such a state that the BIOS can't reinit it (leaving nothing but the unblinking cursor image), complains with a dah-dit-dit sequence of error beeps, and otherwise continues to boot with the frozen display.
Other times, the machine appears to wedge hard.
This occurs equally with Flight 6 straight and the updated kernel. 5.10 had no problems.
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To make matters worse, I've used JFS for the root slice, and various issues therewith are blocking instrumentation of the issue. What diagnostic info I've got will be forthcoming as soon as I find my power brick to run the machine without the dock.
Thank you for your report.
Does this still happen with Dapper RC?