CML - LSPCON mode change timed out after multiple DPMS cycles

A number of employees at my company have been reporting an issue with i915 that appears to still be present on the latest upstream Linux kernel (as of writing this, v5.15-rc7), where after a number of DPMS on/off cycles with an external HDMI display the LSPCON appears to stop responding and die. This issue has been observed on a ThinkPad P1 3rd Gen, and if there's any questions about firmware issues here I should be able to get Lenovo involved.

I've attached a dmesg, note that the dmesg does appear to be truncated - however it still appears to show the LSPCON failure so I don't think it should be an issue. ounsal-dmesg. As well, the CPU here is a i7-10850H so the GPU should be CML.

If you need any more info let me know, and I'll be happy to help.