No POST display via DP

real_aurgathor

I just installed an unused RX580 based card I owned for several years in a Dell Precision, and I do not get the POST display when the monitor is connected via DP. I just see some flickering until the Windows log-in display appears.

However, the POST display is fine via HDMI. Any idea on what may be causing this?

JRB-Ware

real_aurgathor

Drivers.

Bink63

BIOS Video Settings.

Octavean

Bink63 is probably on the money.

Curious about the system specs though and monitor.

real_aurgathor

drivers are loaded after POST
the one and only video setting is "Auto". PC has two x16 slots and the RX580 is in one of those
monitor is a 40" Seiki
PC is a Dell Precision with a v4 Xeon and 48 GB of DDR4 memory ATM

MacLeech

real_aurgathor Do the motherboard, video card, and display ALL have the latest firmware/BIOS installed?

Jbob

So this is a DP vs HDMI thing? Try a different DP cable? I know Nvidia has some firmware updates to older GPUs that are specifically for DP issues. Don't think RX 580s are part of the fixes however.

real_aurgathor

Jbob

It's most certainly not a cable issue. I suspect how the DP related hardware is being used/initialized before the drivers are loaded by windows is what causing it.

For reasons beyond the scope of this message, I decided to go with Nvidia for future GPU purchases, but I got this card a while ago when it was reasonably recent. However, I was unable to install it due it's size in my older PCs.

real_aurgathor

MacLeech

The motherboard definitely has the latest BIOS, but not sure about the video card. Will check on that later, though I don't think it's a video card BIOS issue.

Edit: I looked on the powercolor website and a few saved copies of the same on archive.org -- I don't think there is, or there were ever any BIOS upgrade for the card I have.

Tho only things I found were downloadable copies of the 19.81 Win 10 drivers for 32/64 bit, plus some older (Win 7 / 8 / 8.1 / 10) drivers mentioned on some archived web pages, but I could not download any of those. Not that I really needed any of them, but I was curious if they had any customization, or something beyond the universal drivers released by AMD.

Somewhat-Reticent

Lack of suitable DisplayPort drivers embedded in firmware(s)?
( Sometimes an expected-resolution(s) mismatch … )

real_aurgathor

Somewhat-Reticent

There should not be a need for any DP specific FW in the computer's BIOS. Upon power-up, the video card should detect any thing attached and send any video data there (I think all ports actually if there are more then one monitor attached), and it's up to the video card to properly format the data data for the output used.

The mobo sends the display data to the video card blindly, and lets the video card to do something with it -- either send it to all displays attached, or bitbucket it if there is no display attached.

Historically, the boot display used to be 80x24 text mode, but that's been deprecated and now it's graphic mode in newer BIOSs. I think the lowest supported graphic resolution is 640x480 @60Hz, but that can be upshifted during boot. Not sure if that's just scaling/upsampling done by the video card, or the computer is sending higher resolution data to the card.