My setup(running already for 8 months+)
TB Port (USBto HDMI Cable)VievSonic 1920 display MAIN DISPLAY
HDMI TCL 4K TV
BIOS 72 everything was working normal in particular I had the boot options on both screens i.e, F2 F7 and F10 option during startup.
Installing 76 removed my TB firmware but I have since reinstalled it.
The PC now BOOT's up on HDMI first and I get the Fxx options on the TV but not on my main display. The main display stays Dark until it's Time to sign in to windows (win 10 insider 18855).
I would like to know if this behavior is by design or if there is any option to get it showing on both displays at the same time on BOOT.
Changing BIOS display setting from Automatic to individually select primary display port does not alter anything
Everything work as normal after signing in to windows.
I tried to revert back to BIOS 72 using F7 (I always use F7) but got the message incompatible Version? Never tried downgrading BIOS before so maybe this is normal.
I did some additional tests.
Disconnected HDMI and booted with only TB port display attached.
Completely blank screen until windows sign in screen shows up.
Tried the same thing and start hitting F2 during boot and the screen stays completely black never gets to windows login.
Presumably I'm on the BIOS setup screen but it only shows up on the HDMI attached device.
Downloaded 0076.bio again and re-flashed to make sure there was no file issue.
Uninstalled and reinstalled TBT_WIN10_64_126.96.36.1990
Everything installed without problem
But nothing changed.
The Cable I'm using is a Samsung USBC to HDMI cable and it's been in use for at least six months without any issue, The 76 Bios changed things not the hardware.
The attache SSU was run with this cable installed.
I tested with another cable that I previously used to attach the TV (worked perfectly on TV but did not support HDR10) same problem with this cable: From Amazon-
Cable Matters USB C to HDTV Cable Supporting 4K 60Hz in Black 9.8 Feet - Thunderbolt 3 Port Compatible for MacBook Pro, Dell XPS 13/15, HP Spectre x360, Surface Book 2 and More
A bit of Good news is that the 76 bios graphics bits seems to have improved overall picture stability while streaming to TV both with Chrome and Firefox.
BTW I tried a few different Graphics drivers but I think this is an issue before the graphics driver comes into play.
Since downgrade to 72 did not work, is there another version I can downgrade to? On the other hand I'm happy to live with this if the issue will be fixed in the next BIOS upgrade.
Did one more test.
Put Main display on HDMI and TV on TB port and the issue moves with the port in use.
No Startup option on TB attached display only on HDMI.
Also Uninstalled and reinstalled TBT_WIN10_64_188.8.131.520
Using this setup...No Difference
Reconnected back to old setup.
Thank you for that info. I rather not fiddle around with downgrading since everything is working fine. Do you think that downgrading and reflashing 0076 will restore normal operation if so I might give it a Go.
If a re-flash of 0076 after downgrade will bring me back tho where I am now the I rather wait for the next BIOS upgrade.
I did one more test(to much time on my hands)
Uninstalled TBT_WIN10_64_184.108.40.2060 and then tested to run TBT-FW-Update-33 and then I get the message No TBT installed. Happy with that.
Now I run Intel driver support assistand(no TB software installed) and guess what "All your drivers are up to date" !!!!!
I'm obviously missing the TBT drivers.
Have reinstalled the two drivers but must say I'm a bit confused here,
Can also confirm there is something wrong with bios 0076.
Running a NUC7i5BNK and just updated to 0076 today. After a restart the screen is no longer recognized. I have a Dell 27" 4k monitor that has been working fine for 12+ months and several bios updates. Was at 0072 prior to this and it worked fine (did that update a few weeks ago).
The monitor is being driven via the NUC's usb-C/thunderbolt port and connected with a USB-C to DVI cable (cable matters 4k rated cable). Keep in mind Intel reps, this cable has worked fine previous to 0076 update and fully passed 4k signal from the NUC to the monitor. Prior to the update as the poster above stated, you would see the Intel post screen and have the ability to get into the bios/etc.
On my setup with nothing displays. Its as if 0076 bios has killed off the USB-C/thunderbolt video connection. The computer has attempted to start but nothing displays. I have to manually press the power off button, connect an HDMI cable from the NUC to my dell monitor input and disconnect the USB-C cable from the NUC before restarting. System works then, however I am not getting a sufficient 4k HDR signal thru the HDMI (hence the reason I was using the usb-c to displayport cable before).
I have tried all methods mentioned above of 'restoring the BIOS' with no luck. When doing what it suggest above, I can get to the screen with the flash drive installed and press F4, but then the screen goes black and computer relights. No dice.
Also tried from the intel post screen and pressing F7, but get the same 'incompatible bios version/ aborted' message which won't let me downgrade.
Intel has really messed this one up and needs a resolution ASAP please!
The Thunderbolt upgrade that you link to I have done umpteen times. Also it shows version 33 installed.
I now see more posts appearing so presumably you will have to produce a fix for this issue.
I have used the upgrade instructions You link to from the day that the update was released, I have probably installed this (successfully) about 10 times. But I found a new twist to the saga.
Every time I've done the installation I've Rebooted the computer to test. And the result is as you know
But the last time I installed the 33 upgrade I did not reboot but instead went directly to installed TB devices and be and behold it showed one device installed!
Reboot computer and the TB device is gone again.
By the way I restored the previous insider build that I had Fully working on BIOS 0072 and as expected the problem is still there with the new BIOS, it has Nothing to do with the operating System and all to do with the 0076 BIOS upgrade.
I can confirm the same thing that 'DPers1' has stated:
I can get the thunderbolt to work by reinstalling the tunderbolt software and then upgrading the firmware to 33. It will work initially (video over the thunderbolt port), but upon a restart it will no longer work. Once rebooted on HDMI the thunderbolt is not recognized. Rerunning the thunderbolt software and firmware (sometimes just the firmware) will get it functioning again. Only until the computer reboots.
Also - you cannot downgrade to 0072. I have tried every option shown for this and despite the 0076 release notes stating you can downgrade, you cannot.
Intel needs to fix this
I too have the same issue. When I flashed the 0076 BIOS update the USB-C/Thunderbold port stopped working.
Nothing on the screen until the mainboard hands the boot process over to software OS. In my case this is Linux. I do not see the grub boot screen. The graphics begin when Ubuntu begins to boot.
I have a USB/Thunderbolt to Display port cable. Everything worked with BIOS 0072.
Using an HDMI cable to HDMI on the monitor the NUC boots as it should giving the F2 F7 and F10 options.