Connect 2 4K monitors on the dock and the resolution of the TBT monitor changed after hotplug'd on MTL platform
Kernel: drm-tip 6.7.0-rc3-7bd342323d5b+
Connect one HDMI/DP monitor(4k) and one TBT monitor(4k) to the dock(Dell WD22TBT4), and then connect the dock to the machine, the resolution for the TBT monitor becomes FHD.
I did below steps while capturing the dmesg log
- boot up with drm-tip kernel
- connect TBT monitor on the dock
- connect the dock to the machine
- confirmed the TBT monitor is on 4k@60Hz
- connect HDMI monitor
- confirmed both monitors are on 4k@60Hz
- unplug the cable of the dock
- re-plug in the dock cable
- the resolution of the TBT monitor becomes FHD(1920x1080) and the refresh rate of the HDMI monitor becomes 30Hz
- the refresh rate of the HDMI monitor can be adjusted to 60Hz from the display menu
- but there is no higher resolution could be selected for the TBT monitor