after a windows update yesterday 2 displayport ports of my rx 5700xt stopped working. Only one works. I already tested cables and it is not the problem.
the monitor runs out of signal
Uninstall the last Windows Update(s) and see if your DPs starts working again. If it does, I suggest you hide that update using the Microsoft app I attached and at the same time open a AMD SERVICE REQUEST to let them know that a Windows Update cause your GPU card DP to not function correctly.
If it doesn't resolve the problem then you need to continue troubleshooting the issue. I would try and install the latest AMD Driver for your GPU card and see if that helps any by using DDU in Safe mode with the internet disconnected.
Here is AMD Service Request link: https://www.amd.com/en/support/contact-email-form
Latest RX5700XT AMD Driver: https://www.amd.com/en/support/graphics/amd-radeon-5700-series/amd-radeon-rx-5700-series/amd-radeon-...