Graphics Cards

[d3ca]

Hi, got an issure with the newly installed RX6800. My 4K screen (DP) constantly wakes after standby, but the screen remains black so it displays "no signal" and go to standby again. This happens 2-3 times in a minute.
Waking by mouse works fine.

There is also a TV connected to HDMI.

Checked the "atikmdag_dce.log" and its filled with thousands of entrys. (32000 rows!) Not sure about the meaning of every entry, but I often see:

[+00:824:267] [Conn_Hotplug] [DP-2] - Disconnected

[+00:027:759] [Conn_Hotplug] [DP-2] - Connected

While HDMI is always connected:

[+00:026:237] [Conn_Hotplug] [HDMI-1] - Connected

Here is the full log: https://drive.google.com/file/d/1_g2PjssWSKAPiiuUqHwotIg33W91v5W_/view?usp=sharing

Got no issues while the screen is on, everything works normal.
Of cause I tried changing the ports and unconnect the TV.

Any suggestions?

• AMD Graphics Card Make & Model
  • Radeon RX6800
• Operating System
  • Windows 10 64bit 20H2 Build
• Driver version installed
  • Radeon Software Adrenaline 20.12.1
• Display Make and model and connection/adapter in use, resolution, and refresh rate.
  • LG 27UD68 3840x2160 @60Hz DP
  • Sony KD-55XF9005 3840x2160 @60Hz HMDI
• CPU/APU Make and model number
  • Ryzen 7 5800X
• Motherboard Make & Model + Bios Revision
  • Asus X570 Prime Pro BIOS 3001
• Power Supply Unit Make & Model + Wattage
  • BeQuiet! Straight Power 11 750W Platinum
• System Memory Make & Model + Frequency
  • Crucial Ballistix 3600Mhz CL16 2x16GB

[Thanny · Accepted solution]

Best guess would be a loose or flaky DP cable.  Try another cable before anything else.

[pokester]

Many USB peripherals plugged in can mess with sleep. So unplug anything not your keyboard or mouse and see if this behavior continues. 

You also might try disabling Hibernation/Fast Startup to see if that helps.

[d3ca]

Seems like the DP cable is damaged. Tested another HDMI Cable and the problem was gone.
Ordered a new one. :)

Didn't think of it could be the cable, because it worked well until new GPU...