My system specification:
- AMD Graphics Card
- SAPPHIRE NITRO+ RX 5700XT 8G GDDR6 (no overclocking, Adrenalin's tuning settings are set to "Automatic")
- Desktop
- Operating System
- Windows 10 Pro 64bit (v2004 build 19041.208)
- Driver version installed
- Adrenalin 2020 Edition 20.4.2
- Display Devices
- Samsung Curved C32HG70 (LC32HG70QQIXCI) 2560x1440 @144Hz DP (the same issue happens on HDMI)
- Motherboard + Bios Revision
- Gigabyte Z170-HD3 DDR3 (F21f BIOS, latest)
- CPU/APU
- Intel Core i5-6500 @3.20 GHz (no overclocking)
- Power Supply Unit Make, Model & Wattage
- Chieftec Chieftronic Powerplay Gold GPU-750FC 750W (GPU is connected by 2 separate 6+2 pin cables, the same issue occurs with a single cable connected)
- RAM
- DIMM1: Kingston HyperX KHX1866C10D3/4G
- DIMM2: Kingston HyperX KHX1866C10D3/4G
- DIMM3: Kingston HyperX KHX1866C10D3/4G
- DIMM4: Kingston HyperX KHX1866C10D3/4G
- Total RAM: 16GB
Issue description:
I truly hope AMD team will spot this thread (contacting support directly doesn't work, they say black screens are fixed and it is my issue). So, starting from Adrenalin 20 I have black screens on first Windows boot in 95% cases. If there is no black screen, it will occur if I run Chrome for example (hardware acceleration is disabled, but even if I enable it the same thing will happen). Consequently, I have to reset PC and the 2nd boot takes 2-3 minutes, then everything works whole day. I don't play at this time, it's mostly work (Chrome/Skype/Slack/Zoom/OBS Studio 1440p demo recordings etc.).
I did not have similar issues with Adrenalin 19 but I don't want to revert since those random black screens make me crazy. I'm very happy with 20.4.2 driver, it's definitely a small win but it doesn't help with Windows first boot issue.
I'm very certain it is driver issue. Why? Because in the morning (~7:30am) I have uninstalled driver completelely using DDU. I have turned on PC in 8 hours and it has simply turned on and I'm writing this question. Basic driver is used currently (sorry, it's Ukrainian):
Because of GPU, I have already replaced PSU (I was using pretty good Aerocool VX-750, it's not the cheapest one), so it's definitely not a hardware issue and I truly believe (and hope 
) my GPU doesn't have defects + again, no black screens on the first Windows boot on Adrenalin 19 (e.g 19.12.1).
My mobo is not very fresh so probably it's somehow linked with UEFI (I do have and use it) but it's not that easy to replace it as you may know, since I need to have new CPU + DDR4 RAM too 
Am I the only person experiencing this issue? I was on Windows 10 (1909) but swtiched to 2004 to see whether it makes any difference. But no, black screen on boot is here too.
Will gladly answer any questions
1 Solution
A quick update on the topic, I'm not sure what has helped exactly, but I'll describe all actions I did:
1) Turned off Freesync in monitor settings (was using "Ultimate Engine" setting, switching to "Standard Engine" didn't make big difference;
2) Uninstalled Adrenalin 20.4.2 via DDU in safe mode;
3) Installed Radeon™ Pro Software for Enterprise 20.Q1.2 (it had ended with some error, display driver was installed and AMD Radeon Settings are working too
I turned off PC yesterday and turned it on in 4-5 hours. The first boot was successful, good! Today's morning, I've turned on PC again and it has launched successfully on the first boot too! I didn't try gaming (and seeems this revision is not intended for gaming) but at least I can work on PC.
If the PC will be running fine till Friday, I'll close this question.
I'm running 5700XT since November. I didn't notice so many black screens earlier, they were random and not frequent. I remember that I've even finished Shadow of the Tomb Raider without any crashes, spending 4-5 hours in the game per day. But since quarantine, since I spend whole day near PC + AMD has delivered Adrenalin 20, these black screens became a disaster, especially when you have a videocall with customer (it's ok on the other hand, since you have 2-3 minutes to drink some water ).
I see many positive feedbacks on RX5700XT in the online store where it was bought, many people say everything is ok. It is everything about other hardware which interacts with GPU I think (motherboard first of all). On YouTube, you will also find many "solutions" but almost each consists of "disable this, enable this etc.", only few people resolved it by replacing PSU or cable, for example. All we want just to plug in GPU and work/play, of course.
Thanks to 5700XT, my PC have experienced real evolution, so I truly believe AMD willl fix everything soon.
I had to ruin PC case, it was my first experience with 5700...
Decided to replace the case and PC cooler to achive better temps
Switched to another PSU
Finally, added more RAM (current setup)
Because of so many efforts and expenses, I won't give up yet. But after DP cable replacement, the only thing which is left if that won't work - hoping that AMD will make drivers better soon
You are completely right. I have saved probably $100 buying RX5700XT and have spent a bit more than $200 trying to make AMD thing work without big success!
P.S. Connected my second old 23" monitor (LG D2342P) via HDMI. PC was off for over 4 hours and it is working for over 1 hour without any black screens! I don't plan keeping it though, one monitor is enough for me.
P.P.S. I wish AMD displaying black screen above instead of just black screen...
It still works good on cold boot with 2 monitors connected. What I've noticed is that coolers are turning on more frequently (e.g. each 10 mins at ~1300RPM) but that's expected.
Also, when 1 monitor was connected VRAM was at ~300MHz mark and it was increasing when you watch video/play game/run videocall. Here is old screenshot:
Now it's at 1750MHz almost all the time:
I'll try it later when 2nd monitor will be disconnected but probably setting VRAM to 1750MHz manually will solve the problem with 1 monitor. We were looking at GPU clock all the time.
Also, it may be indeed DP-cable related issue.
UPD May 5th: Running just great, without single crash since morning. I don't need 2nd monitor for everyday usage but it's helpful during online work on quarantine. Patiently waiting for the next driver update + I'll raise another ticket to AMD asking why it works with 2 monitors. I've got impression that 5700XT simply needs heavy loads 
Tomorrow, I'll try enabling Freesync (Ultimate Engine) to see whether it makes any difference and causes black screens
I've read about such solution earlier, but I don't have such option unfortunately:
Most likely, that's because my motherboard is not so fresh. Fast boot is disabled on BIOS level but it did not make any difference.
---------------
Благодарю, но у меня такой опции нет. А вот с двумя экранами работает все, я еще заметил кое-что, опишу отдельным постом.
I have finally reproduced good old black screen again! 
But on one monitor only, fortunately I did not have to reset PC during a videocall.
So, I have enabled Ultimate Engine for Freesync in monitor settings in the morning. It worked pretty fine for around 2 hours, then I had a meeting + 1140p recording at a time and after ~10 minutes I've encountered black screen on monitor with Freesync enabled. My 2nd old LG monitor doesn't support Freesync and I could still talk with another person, I could still work on LG monitor.
I have disabled Freesync in Samsung's monitor settings and within few seconds it started to work. I had another 3 meetings without any issues later on.
There is definitely some Freesync issue in 20.4.2 driver or just not the best compatibility with my monitor. I'll try "Standard Engine" monitor Freesync setting tomorrow.
In general, my system was very stable these days. I've managed to play some DOOM on Sunday, no crashes. No crashes on cold boot anymore, I don't even need to turn 2nd monitor on when starting PC, it's loading in any case. Main monitor is running in "Standard Engine" Freesync mode, I didn't have black screens.
But around 15 minutes ago, when lots of Chrome tabs were opened BSOD has occurred. Here are details:
VIDEO_TDR_FAILURE (116)
Attempt to reset the display driver and recover from timeout failed.
Arguments:
Arg1: ffffc503613772c0, Optional pointer to internal TDR recovery context (TDR_RECOVERY_CONTEXT).
Arg2: fffff80791750818, The pointer into responsible device driver module (e.g. owner tag).
Arg3: ffffffffc0000001, Optional error code (NTSTATUS) of the last failed operation.
Arg4: 0000000000000003, Optional internal context dependent data.
Debugging Details:
------------------
Unable to load image \SystemRoot\System32\DriverStore\FileRepository\u0354308.inf_amd64_48534036afa0f0d8\B354265\atikmpag.sys, Win32 error 0n2
*** WARNING: Unable to verify timestamp for atikmpag.sys
*** WARNING: Unable to verify checksum for win32k.sys
BUGCHECK_CODE: 116
BUGCHECK_P1: ffffc503613772c0
BUGCHECK_P2: fffff80791750818
BUGCHECK_P3: ffffffffc0000001
BUGCHECK_P4: 3
PROCESS_NAME: System
SYMBOL_NAME: atikmpag+10818
MODULE_NAME: atikmpag
IMAGE_NAME: atikmpag.sys
FAILURE_BUCKET_ID: 0x116_IMAGE_atikmpag.sys
FAILURE_ID_HASH: {e300aa8c-6915-3f37-7957-d2e4fc30a6fd}
Followup: MachineOwner
---------I didn't encounter it for weeks, now it's here. Hope it's just one-time thing and I won't see it again. Probably, that's even somehow linked with Windows 10 2004 build, I think they already got a report from me
