9070 XT - 2x HDMI high refresh displays (144 and 120 Hz) not working

[Firegod]

If it helps I asked AI and it said:

The AMD Radeon RX 9070 XT GPU supports up to four displays, with a maximum resolution of 7680×4320 for both HDMI 2.1 and DisplayPort 2.1a outputs. When connecting two HDMI 2.1 displays, each should theoretically be able to run at 4K resolution (3840×2160) with refresh rates up to 120Hz.

So if you have your LG C4 connected, that is a 4K display. Can you drop the refresh rate in Windows to 120Hz (don't pick 144Hz), and then connect the LG C2? Then in theory as that is 4K as well it should allow you to set 120Hz.

 

[Firegod]

I was thinking of picking a 9070XT for the 2x HDMI so that's me out then.

I think this all comes down to resolutions and refresh rates for multiple monitor setups. And using correctly certified cables is important.

 

[King Mustard]

If it helps I asked AI and it said:

The AMD Radeon RX 9070 XT GPU supports up to four displays, with a maximum resolution of 7680×4320 for both HDMI 2.1 and DisplayPort 2.1a outputs. When connecting two HDMI 2.1 displays, each should theoretically be able to run at 4K resolution (3840×2160) with refresh rates up to 120Hz.

So if you have your LG C4 connected, that is a 4K display. Can you drop the refresh rate in Windows to 120Hz (don't pick 144Hz), and then connect the LG C2? Then in theory as that is 4K as well it should allow you to set 120Hz.

Same issue unfortunately - display driver crashes and does not recover (even with Win + Ctrl + Shift + B).

I have some certified cables coming from kenable. Hopefully they help.

If it does end up that the GPU can only do 2x 120 Hz displays on the header when my five-year-old RTX 3080 can drive higher (and with less issues), it is far from a good look for AMD.

 

[fs123]

If the dp2.1 sockets can handle 4K 120Hz then no need to use both hdmi sockets.

 

[King Mustard]

Use an active hdmi-to-dp adapter? If the dp2.1 sockets can handle 4K 120Hz then no need to use both hdmi sockets.

I would prefer two straight HDMI connections.

The adapter, for example, can be sensitive to static in the room and make the display flicker at times.

Plus, I imagine not using an adapter is almost always better than using one.

Either way, the display using the adapter (or even straight HDMI) will not exceed 60 Hz (even though it was perfectly fine on the RTX 3080).

I have two new certified HDMI cables on the way, to see if it helps.

 

[Bidley]

My money is on driver issues. It's only been out a couple of days, so further revisions may sort this.

 

[King Mustard]

My money is on driver issues. It's only been out a couple of days, so further revisions may sort this.

That is a fair point.

 

[AMD_Vik]

@AMD_Vik Sapphire Pulse.

I appreciate it.

Thanks for bringing this up. I'll file this through and see what we can learn. Could you please search your system for 'atikmdag_dce.log' and send that over to me along with any relevant minidmp files over at C:\Windows\Minidumps\ or at C:\Windows\LiveKernelReports\WATCHDOG\ in the mean time.

 

[King Mustard]

Thanks for bringing this up. I'll file this through and see what we can learn. Could you please search your system for 'atikmdag_dce.log' and send that over to me along with any relevant minidmp files over at C:\Windows\Minidumps\ or at C:\Windows\LiveKernelReports\WATCHDOG\ in the mean time.

What is the best way to get them to you?

 

[AMD_Vik]

What is the best way to get them to you?

DM me perhaps, use something like https://send.vis.ee/

 

[King Mustard]

DM me perhaps, use something like https://send.vis.ee/

All done

 

[GoogalyMoogaly]

My money is on driver issues. It's only been out a couple of days, so further revisions may sort this.

It's been the same with my 7900XT for quite some time (over a year I think).
I'm hoping any resolution here will also fix it for my 7900XT.

 

[BS Dave]

It's been the same with my 7900XT for quite some time (over a year I think).
I'm hoping any resolution here will also fix it for my 7900XT.

So it did work before? Or hasn't since you've had the card?

 

[GoogalyMoogaly]

So it did work before? Or hasn't since you've had the card?

No, not since I've had it.
To be honest I haven't tried recently so I guess it might've been fixed, but would seem odd if they've fixed the issue and then had the same thing with the 9000 series.
I don't know how much it's to do with AMD as I don't believe the reference models had dual HDMI ports.