Monitor sometimes won't turn on after resuming from standby

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#3397052 25-Jul-2025 13:46

Ok thats more of a giveaway that you’re having signal interference. Either display cable or power supply to the monitor is being affected by something external.

timmmay

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#3397079 25-Jul-2025 14:54

The new monitor cable is plugged in and everything started fine - it does about 50% of the time anyway. The clothes drier is running and I'm not getting screen issues. So far it's an improvement. I'll report back in a week or so... or if I forget someone will bump the thread in a few years with a similar problem and I'll report back 😉

Thanks for the help, fingers crossed this fixes the problem.

timmmay

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#3397739 28-Jul-2025 15:39

Quick update - with the new cable, resuming from standby has worked 100% of the time, including in situations where the previous cable would have failed. I'm not saying yet it's completely solved the problem but it's at least helped 🙂

gzt

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#3397803 28-Jul-2025 20:20

It did make me wonder if there's another better cable out there, or if the 4K cable instead of the 8k might have been better in some respect, maybe lower strand-count. Instinct tells/told me the 4k might have been the better choice, but I could'nt/can't back that up with anything 🤷

Also been wondering if it's just the plug outer ground gaining tarnish and losing contact over time and becoming suseptible to interference. In which case the same cable new would provide a similar fix. Ime the better cables last reliably anyway so it's not a waste at all.

SpartanVXL

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#3397805 28-Jul-2025 20:28

There are cables sold that don’t meet spec. Plus the infamous pin20 issue with displayport cables not wired right.

It’s gotten better now than 7-10 years ago. With higher bandwidth displays (think 4k 240Hz) monitor need to come with a cable that definitely works.

timmmay

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#3397806 28-Jul-2025 20:33

gzt: It did make me wonder if there's another better cable out there, or if the 4K cable instead of the 8k might have been better in some respect, maybe lower strand-count. Instinct tells/told me the 4k might have been the better choice, but I could'nt/can't back that up with anything 🤷

Also been wondering if it's just the plug outer ground gaining tarnish and losing contact over time and becoming suseptible to interference. In which case the same cable new would provide a similar fix. Ime the better cables last reliably anyway so it's not a waste at all.

I posted something on the last page that suggests the 8K cable is using a newer standard that might have better shielding, according to an AI ;)

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gzt

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#3397870 28-Jul-2025 21:59

timmmay: I posted something on the last page that suggests the 8K cable is using a newer standard that might have better shielding, according to an AI ;)

As good as any guess. A human might guess the 8K is under-exercised in practice.; )

timmmay

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#3412667 8-Sep-2025 20:49

Unfortunately the new cable hasn't resolved the problem. It's improved things, but the past week I've had to power off the computer a few times. A single 2s press on the power button makes the computer shut down cleanly within about 20seconds, I don't have to press and hold the power button to hard reset it.

Does anyone have any other suggestions? I suspect the problem is the Dell monitor not working properly with DisplayPort. Either computer works fine with HDMI, both have problems with DisplayPort.

I wonder if an HDMI switch or KVM type switch would work, since HDMI seems more reliable than DisplayPort. I'd plug both computers into an HDMI switch, hopefully one that can automatically switch inputs plus have a manual override, that switch goes out to the monitor. I already have a uGreen USB switch for switching monitor / keyboard to each monitor, having to push two buttons would be annoying, but auto would be ok. Something like this switch - this is the first decent hit that came up in the Amazon search. Any thoughts or recommendations?

gzt

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#3412686 8-Sep-2025 21:50

It's interesting the new cable improved things. I have to wonder if the 4k would be better.

timmmay

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#3412688 8-Sep-2025 22:02

gzt: It's interesting the new cable improved things. I have to wonder if the 4k would be better.

Based on my brief research looking at cables, probably not as 8K is higher spec. Chat gpt helped me understand the problem better tonight, so long as it wasn't hallucinating, I think I just need to abandon display port altogether.

Apsattv

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#3412762 9-Sep-2025 01:58

Can you try this?

https://www.dell.com/support/kbdoc/en-us/000287285/dell-display-and-peripheral-manager-for-windows

There is also reference here, about an actual monitor firmware update?

https://www.dell.com/community/en/conversations/monitors/u2520d-m3b104-firmware-checksum-error-2/647f96ebf4ccf8a8de9c6575

Dell_U2520D_FWUpdate_M3B104_Windows.zip

https://www.dell.com/support/kbdoc/en-nz/000131809/steps-for-updating-the-firmware-for-your-dell-monitor

Check and see what firmware you are on??? the firmware update might be actual fix to your issue.

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timmmay

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#3412767 9-Sep-2025 07:15

Thanks @Apsattv . I can try that software, though it looks like it's for setup and configuration, I don't hold out high hopes. I'm on the latest firmware, there's been no updates since I purchased the monitor.

ChatGPT says there are often handshaking errors over DisplayPort, and some video cards / monitors are worse than others. Once there's an error either the computer, the monitor, or both need to be power cycled to fix the problem. Turning the computer off and on works, same doesn't work for monitor, and I think I tried unplugging and plugging it back in and that didn't work but it's not very practical anyway.

I'm going to try putting my laptop onto USB video, which I think is DisplayPort over USB but maybe it'll be more reliable. I'll try that later today and report back in a week or so how it goes. Backup plan is HDMI switch.

MadEngineer

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#3412799 9-Sep-2025 08:32

Does your HP hub have DP?

Swap the cables between the devices.

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SpartanVXL

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#3412808 9-Sep-2025 09:07

Do you still have updated drivers for polaris? You can try the nimez/rdn.id custom drivers if there aren’t any modern drivers for your rx550.

https://sourceforge.net/projects/radeon-id-distribution/files/

Edit: can’t recall if you were asked this, have you checked for s0 state in windows?

also try replugging the cable or pressing windows key+ctrl+shift+b to reset the graphics drivers when it goes black.

timmmay

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#3412829 9-Sep-2025 10:07

@MadEngineer If I swap the cables the work laptop has the same problem :(

@SpartanVXL what's an S0 state? I can Google it but I'd be interested in your thoughts and experience. I can try those other things too.

Right now I have the laptop plugged into the monitor directly with USB, still using the dock as a hub for mouse / keyboard, and the desktop on HDMI. I'll see how that works for a few days. It might be easier to avoid DisplayPort altogether.

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