New: External monitor switches to lower refresh rate after resume from suspend

https://bugzilla.kernel.org/show_bug.cgi?id=220486

Bug ID: 220486
Summary: External monitor switches to lower refresh rate after
resume from suspend
Product: Drivers
Version: 2.5
Hardware: Intel
OS: Linux
Status: NEW
Severity: normal
Priority: P3
Component: USB
Assignee: [email protected]
Reporter: [email protected]
Regression: No

Created attachment 308541
--> https://bugzilla.kernel.org/attachment.cgi?id=308541&action=edit
Kernel warning from drivers/usb/typec/class.c

An external monitor is connected to my laptop via USB-C port. Normally it works in 3840x2160@30Hz mode. Sometimes after resuming from suspend, it falls back to 2048x1080@24Hz mode which is the highest available setting. This can be fixed by re-plugging the USB-C cable or reboot.

At the same time I see a kernel warning raised by the USB driver (see attached log).

Kernel version: LTS 6.12.41

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