Displayport to HDMI cable doesn't output display upon booting to Windows.

[emothxughts]

A few weeks back, I bought a DP to HDMI cable (the 4k option) to connect my GPU (RX 5600 XT) to a monitor that has only an HDMI port and a D-Sub port (buyer's regret here). I am currently using an HDMI to HDMI cable and it works more or less fine, I can play games and bask in their beauty. But said card has only one HDMI port (and 3 DP), and I'd like to use the DPs in case the HDMI port fails.

Problem with the DP-HDMI cable is, it can output display at the BIOS screen, but once the display is off and Windows is loading (and presumably the display drivers too?), the display stays off instead of showing me the login screen. In fact, my monitor then says that it has no display input into it and goes into power saving mode. This also happens with my other card the RX550. In the end I had to stick with the HDMI-HDMI cable.

Admittedly the DP-HDMI cable is a cheap one apparently without an active converter. But yeah, how do I make this cable work in Windows?

Edit: The monitor is LG 24MP400.

 

[TheoneandonlyMrK]

A few weeks back, I bought a DP to HDMI cable (the 4k option) to connect my GPU (RX 5600 XT) to a monitor that has only an HDMI port and a D-Sub port (buyer's regret here). I am currently using an HDMI to HDMI cable and it works more or less fine, I can play games and bask in their beauty. But said card has only one HDMI port (and 3 DP), and I'd like to use the DPs in case the HDMI port fails.

Problem with the DP-HDMI cable is, it can output display at the BIOS screen, but once the display is off and Windows is loading (and presumably the display drivers too?), the display stays off instead of showing me the login screen. In fact, my monitor then says that it has no display input into it and goes into power saving mode. This also happens with my other card the RX550. In the end I had to stick with the HDMI-HDMI cable.

Admittedly the DP-HDMI cable is a cheap one apparently without an active converter. But yeah, how do I make this cable work in Windows?

Edit: The monitor is LG 24MP400.

I don't have a fix.
But every, Every time I tried one it has never worked for me.
3x pc 5x screen.

I don't know why, but now I use a dp to hdmi adapter (powered I think)because of the above

 

[agent_x007]

Safe mode ?
It's possible Windows is simply using settings that are beyond cheap adapters capabilities (ie. DP 1.4 setting, on 1.2 only adapter).

 

[Chomiq]

Disconnect the display. Hard power off on PSU and display, wait few minutes and power on again. Remove any hidden display devices in Device Manager.

 

[DR4G00N]

The passive adapters are only good for 1920x1080 60Hz, you'll need an active adapter for 75Hz.
You got further than I did with a cheap cable, mine didn't work at all.

I ended up with this: https://www.amazon.ca/dp/B08XFYHFCK

There was also a normal DP version but it seems to have disappeared off amazon.

IMO just stick with the HDMI, I've never had an HDMI port fail on any of my devices so I don't think it's something to worry about.

 

[QuietBob]

once the display is off and Windows is loading (and presumably the display drivers too?), the display stays off instead of showing me the login screen. In fact, my monitor then says that it has no display input into it and goes into power saving mode.

Perhaps you need to wait a little longer at this stage for the display to initialize. Give it a couple of minutes? I'm using an active 4K60 DP->HDMI adapter to output 1440p from my secondary PC. I've observed the same symptoms as you. Now I have to wait longer than usual for the display to come on as the system loads.

If that fails, consider purchasing an active adapter with HDCP.

 

[ThrashZone]

Hi,
Odd I'd think you'd more likely miss boot/ bios options rather than login.

I usually scale to larger hdmi displays from a smaller 16x9 monitor everything just look better to me from a distance.

I prefer 1600-900 but tough to find one dp port so in that case I use a 1920-1080 or 24".

 

[emothxughts]

Perhaps you need to wait a little longer at this stage for the display to initialize. Give it a couple of minutes? I'm using an active 4K60 DP->HDMI adapter to output 1440p from my secondary PC. I've observed the same symptoms as you. Now I have to wait longer than usual for the display to come on as the system loads.

I waited for 5 minutes upon Windows loading, still no display. It seems this cheap DP-HDMI cable is a dud. Reminder to self to buy an active DP-HDMI adapter next time.