My production desktop’s dual monitor setup gets a little wonky from time to time. For some odd reason, the right-hand (primary) monitor will start blinking on and off. It’s annoying, but not overwhelming. When it happens, an apparently flaky video driver forces fix revisits. Basically, I keep trying stuff until something works. By no coincidence, that’s a decent operational definition for troubleshooting.

Items Checked When Flaky Video Driver Forces Fix Revisits

It usually goes something like this:

1. Use the Winkey-Ctrl-Shift-B key combo to reset the graphics driver. It does work, sometimes…
2. Check GeForce Experience to see if a newer driver is available; if so, install it.
3. If using the Nvidia gaming driver, switch to Studio driver, or vice-versa.
4. Uninstall, then reinstall the Nvidia driver. I also recommend using the freeware DDU tool to remove all traces of the old before installing the new.
5. Visit the Nvidia Driver Downloads page, and start trying older drivers, going back one version at a time… The recent entries in that list for my GeForce RTX 3070 Ti appear as the lead-in graphic for this story.

Today’s Fix Occurred Mid-way in Sequence

I got to Step 4 today before the blinking stopped. That’s a bit further than I usually have to go, but that’s Windows for you. I’m just glad I can concentrate on what’s showing on both displays, rather than how one or the other is (mis)behaving.

Some Windows errors or gotchas can be set aside and ignored for a while. Others — especially when they interfere with normal system operation — demand immediate attention. While today’s gotcha was one of the latter, it was familiar. Thus, I knew what to do, and how to do it, with minimum need for diagnosis and root cause analysis.

I just marched through the foregoing list and found my solution in under 10 minutes. I can only wish that all problems were so easily fixed. And that’s the way things are unfolding today, here in Windows World. Stay tuned: there’ll be more!

Note Added August 13

Yesterday, I installed a new NVIDIA Studio Driver (version 516.94). The problem has not re-appeared since I applied my uninstall/reinstall “fix” earlier this week. That jumps me up from Step 4 (original fix) to Step 2 (current fix). And so it goes…

It’s always the little things that jump up to bite you (or me, anyway). In today’s case, it was my blithe assumption that Intel Integrated Connectivity (aka CNVi) wouldn’t prevent the AX201NGW M.2 Wi-Fi card from working on my AMD B550/Ryzen 3 5800X build. Yeah, right! But when I replaced it with a no-name (REKONG) Media Tech MT7921K module (depicted in the lead-in graphic), Device Manager picked up that non-Intel hardware immediately. After a bit of driver fiddling, this US$29 (tax included) nonCNVi M.2 Wi-Fi Device delivers LAN access as it should. It does have interesting limitations, though . . .

Fiddling Means NonCNVi M.2 Wi-Fi Device Delivers LAN Access

At first, after plugging in the device, I saw only non-working BlueTooth and Network Adapter devices in Device Manager. This informed me that Windows couldn’t find the required drivers on its own. But a quick search on “Windows 11 drivers for MT7921K” quickly turned up what I needed. They’re available from Lenovo, as it turns out, with a separate .exe for each of Bluetooth and Wi-Fi.

As the owner/operator of half-a-dozen (or more) Lenovo laptops, I’m quite familiar with their self-installing drivers. After downloading and installing them, here’s what I see in Device Manager:

With the right drivers installed, the BT components and the Wi-Fi interface all show up. Good!

Just a Few More Things

Wi-Fi behavior on desktops can be interesting. The interface has a tendency to turn itself off upon reboot, I’ve learned. I’m also trying to figure out why I can access the LAN (via the nearby Asus AX6000 router), but I can’t yet get Internet access through this interface. I have a wired GbE connection that works fine, but had hoped to switch over to wireless. So now, I’m researching those two issues in hopes of finding solutions soon.

A little more time put intro troubleshooting the M.2 Wi-Fi card tells me lots of interesting stuff:

• The lack of an external antenna means the device doesn’t see that many wi-fi interfaces as it scans the airwaves. Thus, for example, it doesn’t see the Spectrum-supplied router in my bedroom closet (all of my laptops in the same office see it quite well).
• The fastest throughput I can get on the device is between 250 and 300 Mbps (observed through a connection to Fast.com).
• The 2.4 and 5 MHz connections to the “office router” are flaky in interesting ways: sometimes, I can access one or the other to get on the LAN, but don’t get Internet access. At other times one channel or the other will be inaccessible. Again, I attribute this to lack of an external antenna. My son has a PCIe 802.11ax adapter card with triple external antennae in his bedroom, and he gets up to 900 Mbps from the bedroom closet router, and up to 500 Mbps from my office router.

No External Antenna Is NOT a Plus

I’m increasingly inclined to observe that an M.2 Wi-Fi card makes sense only where close proximity to a WAP is available. It’s probably not a good idea for machines that do lots of heavy upload/download stuff, either. That’s kind of what I wanted to learn more about, so I’m not disappointed by this experience. I feel like I understand the capabilities and limitations of these devices much better now. I will keep my GbE wired connection going forward, too: the M.2-based Wi-Fi is not fast enough for my needs. If I’m ever *forced* to go wireless, I now understand that a PCIe device is my fastest option.

Talk about great timing. I just finished a marathon work engagement on Thursday, and was playing catchup yesterday. As I was beavering away at a mountain of email and phone calls, I noticed my right-hand monitor acting up. It started going into what I call “blink mode.” That means it would go black every 30-60 seconds, after which it would return to what looked like normal operation. As you can see from the lead-in screencap, the right hand monitor is labeled “2.” Fortunately, monitor 2 blink mode gets easy fix (this time, anyway).

Here’s How Monitor 2 Blink Mode Gets Easy Fix

From long experience I know that when Windows monitors/displays start acting up, there are two common causes. Most common is a misbehaving graphics driver. Second most common is some kind of hardware fault, out of which the cable running from PC to display is most likely.

“Hmmmmm” I found myself thinking “Didn’t I ignore a recent Nvidia Studio Driver update because I was too busy to mess with it?” And indeed, when I ran GeForce Experience, it updated itself right away. Next thing I noticed was a new release of the aforementioned driver (Version 511.65) was out with a February 1 release date.

Consequently, I grabbed and installed that driver right away. Luckily for me, it fixed the problem. The monitor hasn’t blinked once since the update (at least, not that I noticed). It’s a good thing that the obvious fix sometimes works. It’s a better thing that it worked this time. Better still, this problem didn’t manifest until AFTER my recent work marathon ended. It would have been problematic troubleshooting an issue in the middle of a deposition, with the clock ticking away.

What If The Driver Update Didn’t Fix the Problem?

I keep cable spares around as a matter of routine. Thus, my next attempt would have been to swap out the DisplayPort cable from monitor to GPU. If that hadn’t worked, I would have swapped the monitor from one of my test PCs (I have a spare, but I’m using it to check dual-screen behavior on Windows 11 Dev Channel). I’m pretty sure the GPU is OK, because Monitor 1 has remained rock steady throughout this situation. That said, I could always switch the second monitor to HDMI, on the chance that the GPU port itself was having issues.

That’s the way things go here in Windows World. I’m glad the simplest, most obvious fix did the trick. You would be too, if it happened to you.