I have finished analyzing the data from HWinfo. There were absolutely no deviations from the expected references. However, I believe I have finally stumbled upon the root of the issue.
To be precise, I noticed in Device Manager that both the PCIe controller and an 'unknown device' were missing. This occurred following a DDU uninstallation of the drivers, but since everything seemed to be functioning perfectly fine, I assumed no action was required. After all, what is a couple of small yellow exclamation marks? I see them constantly.
Neither incantations nor magic could force the installation of this PCIe component or the unknown device. I performed yet another clean installation of the latest Nvidia drivers along with GeForce Experience. Everything proceeded without incident, yet the drivers still failed to appear in Device Manager. Even after updating Winsi, the system failed to locate the drivers, even after attempting to search for and uninstall them manually.
I attempted to use the drivers provided by the motherboard manufacturer, but they simply reported that they could not be installed for a specific device—the usual "unknown/unable to find" nonsense.
I set out to investigate the identity of that unknown entity, and lo and behold, I found it! They are the Nvidia drivers for USB and USB-C. It appears Nvidia neglected to include these specific drivers in their standard installation package.
We are talking about the "Fresco Logic xHCI (USB3) Controller" and the "Nvidia USB Type-C Port Policy Controller." I downloaded the former manually, but even that proved futile, as there is no recognized device for them to attach to.
In the meantime, my monitor began shutting off again, displaying that infuriating "HDMI Power Saving" message. While Winsi continues to run in the background, the screen remains black and refuses to wake up. The only remedy is a hard reboot.
And so, to conclude how I eventually resolved this mess:
I installed Driver Booster 7, which updated several drivers to newer revisions, though it did nothing to address the two primary issues. I then tried the same approach with Driver Easy. I spent time scouring the internet, searching through the endless void of "PCIe missing, failed, unknown, solved, download..." until I finally encountered
Driver Updater. Upon scanning, it immediately identified the missing PCIe and the second 'unknown' device. It asked if I wished to install them; I said yes, of course, and—presto!—the yellow exclamation marks vanished. 😁 Or rather, they moved under USB controllers. They are technically installed now, but given the nature of the OS and the HW, they cannot actually be utilized, so it makes no difference. I have no intention of deleting them.
The Nvidia audio drivers were also installed; I don't need them since I use Realtek, but I shall leave them be. One wouldn't want to delete something only to realize later it was necessary for some obscure reason. 🙄
There you have it. Perhaps this experience will prove useful to someone else struggling with an Nvidia card. BTW, for the last two days, the computer (or rather, the monitor) hasn't shut down once. It has been running 24/7 under constant, intense gaming loads. In other words, I am actively provoking it to fail.
Here is how they were renamed and finally appeared in Device Manager:
(image)[/IMG]