DP monitor wakes every 30s in Windows standby

[SnkB]

Hello good day!

I have a problem, I believe it's already recurring.
I have an Alienware M15 R6 with the RTX 3070. Intel Core i7 11800H processor, with an LG 29WK600W monitor, connected to the notebook (thunderbolt 4 with DisplayPort function) via USB-C to DisplayPort cable.
It turns out that when locking the system (Win Key + L) the notebook's integrated screen turns off correctly and the monitor goes into standby. However, after 30 seconds I hear a noise of disconnecting and reconnecting the USB and the monitor turns on, it does not display an image (the system is in standby, the notebook's integrated monitor is also off), the monitor returns to "no signal" mode and turn off again. Returning this status every 30 seconds.
I've already made 3 exchanges of usb-c cables for DP and it didn't solve.
Using a USB-C hub with USB-A + HDMI works flawlessly for video and standby.
Using the USB-C to DP cable, the video works perfectly, but the monitor does not go into standby, restarting every 30 seconds.
can anybody help me?

Attached is a video that I even sent to Dell support, demonstrating what happens, so that we have ways to deal with it.

Thanks!

[DeividA_Intel]

Hello SnkB,  

Thank you for posting on the Intel® communities. I am sorry to know that you are having issues with your Intel® UHD Graphics for 11th Gen Intel® Processors  

In order to better assist you, please try the following:  

1. Is this issue recent? If so, when did it start?

2. Are you able to test with a straight connection (HDMI to HDMI, DP to DP)?

3. Just to confirm, this issue also happens with the latest Intel driver version 31.0.101.3222 and 31.0.101.2111?

4. Just to confirm, you mentioned that you have tested 3 different cables "USB-C to DP", is that right?

5. Have you tried different monitors or TVs?

6. Did you get a response from Dell?

Regards,  

Deivid A. 

Intel Customer Support Technician 

[SnkB]

1. Is this problem recent? If yes, when did it start?
Answer: It's been about 2 months

2. Can you test with a direct connection (HDMI to HDMI, DP to DP)?
Answer: I can't, as my machine only has the Thunderbolt 4 connector, which provides DP video.
HDMI to HDMI works correctly, however USB-C to DP, the monitor does not enter standby properly.

3. Just to confirm, does this issue also happen with the latest Intel driver version 31.0.101.3222 and 31.0.101.2111?
Answer: Yes, with both drivers.

4. Just to confirm, you mentioned that you tested 3 different cables "USB-C to DP", right?
Answer: Yes, I even ordered another USB-C to DP adapter from HP to test again.
Even using a USB-C + HDMI + 3 USB's 3.0 hub, it doesn't have the problem. The video works normally and the monitor goes into standby correctly (the HDMI > HDMI connection remains, passing through the USB-C port)

5. Have you tried different monitors or TVs?
Answer: On my 4K LG TV, it works correctly via HDMI > HDMI. The problem only presents when using DP mode.

6. Did you receive a response from Dell?
Answer: They are asking for several tests to rule out a hardware failure. I've done numerous tests, system recovery, clean installation of Windows 11, but nothing works.
They even want to do a remote access to the machine to check the settings.

[DeividA_Intel]

Hello SnkB, 

Thanks for your response. Based on your response and the test performed, looks like this issue is related to the adapters. Your laptop may not support this kind of adapter and Intel does not recommend using any kind of adapter and can not guarantee 3rd party products/adapters will work as expected.

At this point, I recommend you to keep checking with Dell support to confirm that there are no hardware issues with the laptop and that you are using the proper drivers approved by Dell.

Also, you may find some extra information in the following link:

• https://www.intel.com/content/www/us/en/support/articles/000026412/graphics.html

Please keep in mind that this thread will no longer be monitored by Intel.  

Regards,  

Deivid A. 

Intel Customer Support Technician 

[SnkB]

So Thunderbolt 4 has no video output and any machine that has thunderbold 4, will a USB-C to DP adapter work?
In this case, Intel's orientation is only to use HDMI?
I saw that other people here on the forum have the same problem.

[n_scott_pearson]

No, that's not correct. There is typically a processor graphics channel dedicated to each of the Thunderbolt channels provided. In the current processor generation, this is a DisplayPort 1.4 graphics channel (it was DisplayPort 1.2 for the most part in earlier generations). The way that the graphics channel is exposed is almost identical between USB and Thunderbolt, and thus a quality USB-C-to-DP or USB-C-to-HDMI dongle will be able to expose this graphics channel regardless of whether there is a USB or Thunderbolt capability behind it. The difference is the the system with Thunderbolt can always support the full bandwidth of the graphics channel whereas USB, if also supporting other USB devices, may not be able to support its full bandwidth (with DisplayPort 1.2, you would see support dropping from 4K@60Hz to 4K@30Hz, for example). As the newer USB versions - USB 3.2 Gen2 and (especially) USB 4 - come available, the USB-C ports will always be able to support the full bandwidth of the graphics channel. At the same time, with support for DisplayPort 1.4 and beyond coming online, you can see the graphics channel being able to support dual 4K displays and single 8K displays.

So, why does Intel waffle so much when it comes to dongles, hubs and docking stations? Well, first of all, a good percentage of these components are, quite simply, unreliable crap. Secondly, Intel (or AMD, for that matter) simply cannot test every one of these components. The cost of keeping up with the new components appearing practically daily and testing all of these components would be *huge* and would significantly increase the cost of the platform. Bottom line, Intel stance is to not recommend these components - despite the fact that a component is actually needed to even use the ports - and to require that issues be demonstrated either without these components or with components that Intel has validated and included on their (admittedly fairly anemic) compatibility lists.

Hope this helps,

...S