I run a 64bit windows 7 machine. I bought two pluggable usb video adapters, and hooked them up to two Dell 210PH 23 inch monitors. I also connect one 23 inch monitor via my computer.
I have latest drivers installed. Every time I book up and plug in one plugable adapter, the monitor works fine. However, whenever I try to put in the second plugable adapter, both plugable-monitors freeze up. Can you help me get the 3 monitors up and running?
5.5.27797 (I may have this number wrong, but I think that’ s right. I downloaded it a couple weeks ago. It was the latest version that was stable, but not the beta).
When I plug one plugable monitor in, either directly into the computer or via my separate powered usb hub, the one plugable monitor works fine.
However, when I plug the second plugable monitor in, all the monitors flickr, the second monitor has the background image appear, and then it freezes with horizontal lines making the image fuzzy. The first plugable monitor freezes as well.
I’ve only gotten the three monitors to work together once. I couldn’t let the computer sleep (otherwise, the monitors froze), so my only solution was to keep the computer awake using a refresh extension on Google Chrome (normal “awake all the time” in Windows 7 didn’t work). However, I needed to take my laptop once with me on the road, and haven’t had success since.
The behavior you’re seeing is obviously not normal. We’ll get this figured out.
First, I’d like to confirm or rule out that one of the two USB graphics adapter units might be bad.
Can you mark one of the adapters some way (a piece of tape, or note its serial number), and then confirm that the problem happens in the same way, when you plug in the other USB graphics adapter first? (if the problem happens with either order, then we can suspect something about the overall configuration, rather than a particular unit)
Another quick question: can you describe a bit more about your overall USB configuration? Are you plugging all devices directly into a desktop or laptop? And are there any USB hubs or other USB devices involved?
Thanks for your replies, and for your patience while we get this figured out!
The problem happens in both directions, albeit in different ways. Sometimes one screen goes black, sometimes they both freeze. There doesn’t seem to be any method to the madness :-P.
I’ve tried multiple configurations. I have a laptop with two usb ports (and I need one for my mouse). I’ve tried plugging both monitors into a non-separately powered usb hub, but I’ve also tried plugging into a separately powered usb hub. No luck either way.
The one screen that goes black - is it consistently one adapter? or both have done it at some point in the past?
I think your tests have pretty much ruled out not having enough USB bus power.
Since the problem only seems to happen when 2 adapters are connected, let’s try to rule out a problem with total desktop/framebuffer size. Can you run a quick test where you 1) plug in one adapter, then set its mode down quite low (something like 800x600) 2) plug in the second adapter, also set its mode low.
Did these steps avoid the problem? (unlikely, but will help rule out that problem).
At this point, what I’d like to do is get you a 3rd test adapter, to see if we can identify one of the units as a troublemaker. Can you email your Amazon order # to firstname.lastname@example.org, and let us know if the address from that order is still good.
We’ll get this figured out and solved. Thanks so much for your patience!
Thanks. I did what you suggested above. When I downgraded the second monitor, and then plugged in the third monitor something strange happened - for a brief moment, both plugable monitors worked at the highest resolution. However, almost immediately, but froze in different stages of half pictures/half black streaks. My analog monitor also went crazy too (black streaks), so I had to restart.
Also - one of my units (which I use for the second monitor) goes fuzzy every ten seconds or so for a brief amount of time, even though Ive set the driver to optimized for video. Not sure if this is relevant/helpful.
We’re going to send you that 3rd adapter to help figure this out. Thanks for your patience while it makes its way to you!
Quick note - Having the “optimize for video”, available from the DisplayLink system tray applet, set “on” is what’s causing the fuzziness. This option is off by default, and really should stay off for most users. It’s only useful to turn on temporarily to watch a movie. - and then immediately turn off once the movie is done. When it’s on, text and normal windows, etc. will appear fuzzy for a second every time they move, and only after a delay become clear again.
(it’s effectively an interlaced rendering mode to reduce the load on USB, where all lines don’t arrive until some time later. Looks better for motion video, but worse for everything else).
Very glad to have you up and running. We definitely want to get that bad unit back to try to figure out what was causing this strange behavior – we’ll send you a prepaid shipping label this week. Thanks so much for returning it to us for diagnosis!
Thanks again for your patience while we got you fixed up.
Ah, what a bummer this is still an open mystery. The suspicion now shifts back to a driver conflict with the system’s main graphics controller (do you know what intel/ati/nvidia graphics controller you have, and what driver version for it?)
Yes - let’s remote in to try to get this nailed. Can you email email@example.com and we’ll try to figure out a time that works?
Bernie - thank you. That’s very kind of you. I did find the same problem occurring when I restarted my computer, however I had to get to the airport before I could reinstall the driver. I will try that when I get home. All the best. - Kesav