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Sorry no idea. If it can't work in Windows, less hope it will work in Mac. What you mean "not recognized" in windows? an unknown device in device manager or nothing new at all? Are the antenna correctly connected?

this is the patch i chose. based on RehabMan's HDMI patch, adding eDP support, so far so good..

1. change a high-quality HDMI cable ... (don't laugh, do introduce difference) 2. Found thinkpad x1c using eDP rather than LVDS, change HDMI patch 3. carefully follow the wonderful HDMI audio guide now it seems ok..

i carefully choose the one with 2 cut-ins. Actually mine BCM94352z is DW1560 (from a DELL laptop) Have no idea whether the one with one cut-in work or not.

After complete remove VirtualBox and observed 5 days, no more unexpected reboot. Pls mark this thread SOLVED. thanks for your help.

Sorry. Re-generated & attached. thanks.

VirtualBox 100% removed , this issue remains. Since it's a working machine it's hard to have a fresh install, and i have to have necessary applications installed. PR attached. Thanks. Any hints?

Thank you. as always. However, virtualBox is not the root cause - previous clean install w/o virtualbox still has this issue. Just wondering how to track issue like this...

almost everything is working perfectly except when i leave the system idle for enough time (say, 30m or more), there is 50% chance it cause a sudden reboot without closing running apps correctly .. and i have no clue how to track/debug it. Native power management should be ok according to...

yes... exactly, PM981 sold...

as title. typically when i plug HDMI, internal display goes off, and no HDMI video at all. when unplug-HDMI, the LCD remain off. Occasionally, there will be HDMI video+audio correctly, but internal LCD always off. Never success when plug HDMI during boot up, both screen remain off. Thinkpad x1c...

not yet..observed different behavior on 2 type-C ports. continue digging.

i update too. no luck.

no i didn't. actually i switched to a new x1c 5th with i7 and HD620, 10.13.4 works well. Suggest you provide full Problem Report to seek help here.

Sadly say, no. a fresh install of 10.13.4 never success. :(

thanks comment. Given currently this machine is my working machine, i didn't try further effort yet - means HDMI audio not work, Handoff not stable, trackpoint unstable...and fear to try High Sierra. :) would like resume this debug progress shortly and report back here.

you will find BIOS/Post error if met whitelist issue..

yes i replaced the wifi module to a BCM94352z. then everything looks ok, so far.

Without detail investigation, had thought those type-C should connect to TB3 controller, given they have display output capability in Windows - However, those ports also have USB capability, means TB3 control has its own USB implementation or somehow connect back to XHC? So the question becomes...

Understand your suggestion. The @2 port didn’t connect to anything. Actually this laptop has 2 type-C TB and only one HDMI, no other display related port. Lenovo specs says it can connect to 3 displays at same time, means 2 TB+ 1 HDMI. After HDMI was detected on @1, I should remove @2...