Comment # 4 on bug 1190286 from Felix Niederwanger

Hi Iwai,

I now tried to reproduce the hang but am unable to. Rebooted the laptop several
times, rebooted the docking station, plug out, plug in but the issue seems to
be gone.

This morning the laptop froze like at least three times in a row, one time in
the middle of a htop window. I could ping the laptop but not ssh to it.

Let's leave this issue open until tomorrow, but if it does not reoccur this
might be just a one-time thing that's not worth chasing.

For the record, the i915 errors are still present

> # dmesg | grep i9
> [    3.580508] i915 0000:00:02.0: vgaarb: deactivate vga console
> [    3.582892] i915 0000:00:02.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=io+mem:owns=io+mem
> [    3.583677] i915 0000:00:02.0: [drm] Finished loading DMC firmware i915/kbl_dmc_ver1_04.bin (v1.4)
> [    3.599922] [drm] Initialized i915 1.6.0 20201103 for 0000:00:02.0 on minor 0
> [    3.631395] fbcon: i915 (fb0) is primary device
> [    4.772386] i915 0000:00:02.0: [drm] fb0: i915 frame buffer device
> [   12.011087] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
> [   12.288226] mei_hdcp 0000:00:16.0-b638ab7e-94e2-4ea2-a552-d1c54b627f04: bound 0000:00:02.0 (ops i915_hdcp_component_ops [i915])
> [   29.349099] i915 0000:00:02.0: [drm] Reducing the compressed framebuffer size. This may lead to less power savings than a non-reduced-size. Try to increase stolen memory size if available in BIOS.
> [   34.950457] i915 0000:00:02.0: [drm] *ERROR* mstb 000000004491b89b port 1: DPCD read on addr 0x4b0 for 1 bytes NAKed
> [   34.959839] i915 0000:00:02.0: [drm] *ERROR* mstb 000000004491b89b port 2: DPCD read on addr 0x4b0 for 1 bytes NAKed
> [   34.970051] i915 0000:00:02.0: [drm] *ERROR* mstb 000000004491b89b port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed