It detects a nonexistent second monitor - the cursor goes out of view

255 said:

Ah, I'm not using DVI, I'm using VGA. But plugged in the GPU of course.

What manufacturer produced your card?

I have a Sapphire HD5770 Viper-X, and it does not have a VGA output. It has two DVI connectors, one HDMI, and one DisplayPort.

So how is your monitor connected using VGA??

I'm still not clear on the symptom. You're saying that the program window opens properly on your visible monitor but at the same time the cursors moves to a strange location offscreen??

Do you have the mouse Pointer Options "Snap to" box checked, to automatically move pointer to the default button in a dialog box? This should only apply to dialog boxes of course, not to program windows opening, but I can't imagine why the cursor is moving anywhere when a program window opens?

... the mouse is not moving by its own, but if I move it, it doesn't stop in the edge limit but it goes far off the screen because Windows thinks that on the right there is another monitor...

This is especially annoying when closing a max-sized window quickly because the mouse doesn't hit the X and so you have to slowly carefully point it on the X otherwise it goes on the second ghost screen.

Another "proof" of this second unexistend monitor is going in desktop => right click => screen resolution => clicking "detect": another monitor appears on the right, a bit smaller then the "real" one and it's called: "another non detected monitor".

I have a Sapphire HD5770 Viper-X, and it does not have a VGA output

Mine is ASUS EAH5770 CUcore and as you can see on Google it has a VGA output and a DVI output. I do not have a DVI cable though so I connected it to the VGA output.

255 said:

... the mouse is not moving by its own, but if I move it, it doesn't stop in the edge limit but it goes far off the screen because Windows thinks that on the right there is another monitor...

This is especially annoying when closing a max-sized window quickly because the mouse doesn't hit the X and so you have to slowly carefully point it on the X otherwise it goes on the second ghost screen.

Another "proof" of this second unexistend monitor is going in desktop => right click => screen resolution => clicking "detect": another monitor appears on the right, a bit smaller then the "real" one and it's called: "another non detected monitor".

Strangely, the second and third paragraphs of your post did not show up on the screen! All I originally saw was the first paragraph. It was only when I pushed "quote" to reply that amazingly the second and third paragraphs magically appeared.

And yet now all three paragraphs are visible! Very strange.


Anyway,

(1) On my 2-monitor setup (1 on the left, 2 on the right), if I move the mouse to the left edge of monitor 1 it will stop at the edge and not go any further. It remains fully visible on that left edge of monitor 1.

But if I move the mouse to the right edge of monitor 2 it actually will go "somewhere" offscreen, because the cursor disappears. I don't think it's too far away (definitely not miles) because when I then move the mouse back to the left the cursor reappears almost immediately. So it clearly was not off there some unlimited distance into nowhere.

Nevertheless, the mouse/cursor behavior is different for me on the left edge of monitor 1 vs the right edge of monitor 2, though I would hardly call this a serious defect. If anyone is to blame it's probably the ATI drivers (I'm using 12.3).

(2) Even in my own 2-monitor setup, if I right-click on the desktop and select "screen resolution" and then click "detect", I too show my two monitors as well as a "third" non-detected monitor. It's shown as smaller than my actual monitors, but I really don't know what it means or represents.



I suppose its location to the right of my monitor 2 is why the cursor can go off the right edge of monitor 2. It's probably over there on the "non-detected monitor", whatever that means.

Had an interesting new observation to add to the mix here...

My original dual-monitor configuration had #1 (primary) on the left and #2 (extended) on the right. Total desktop width is 1920+1920=3840.

But pixel location 0 is the left edge of the primary monitor, #1. At least one of my applications (Free Commander) has an INI file with its window location expressed in pixels. So with #1 on the left and #2 on the right, and the Free Commander window located on the right (#2) monitor, the window location pixel value in its INI file is something like 2020.

Ok. I had occasion to reverse my two monitors, because of my wanting to use one (on the left) in either DVI or HDMI connection, while the other one (on the right) can only be used in DVI mode. To make the "toggle" for the DVI/HDMI monitor as painless as possible, I moved all of the desktop objects I used to have on that monitor (when it was primary #1) to the other monitor (on the right). I also then set that monitor on the right to now be primary (#1), and set the monitor on the left to now be extended (#2).

Well, the first time I opened Free Commander after this reversing of monitors to Windows the program window was off the screen... to the RIGHT of monitor #1. And that's because its INI window location value was 2020 (which used to be on my right monitor when it was #2), which is TO THE RIGHT of the right edge of what now was monitor #1, since it is the left edge of monitor #1 which defines pixel location value 0 (with its screen width of 1920). In other words, the Free Commander window was off-screen and invisible, and had to be moved back to the left (onto monitor #1) using the technique described earlier in this thread in order to become visible again. And if it is pulled to the left edge of that right monitor (which is now #1), its INI window location pixel value is 0.

And, if the program window is then dragged onto the left monitor (which is now #2), its INI window pixel location value is NEGATIVE... e.g. -1890.

In other words, all desktop locations are left or right relative to 0 which is defined as the left edge of whatever your primary monitor #1 is. Locations to the right of the left edge of #1 are positive, and locations to the left of the left edge of #1 are negative.

And if you rearrange monitors (e.g. using Catalyst and desktop configuration), program windows whose previous location somewhere on the 2-monitor desktop width as it used to be configured may have been visible, will now be off-screen and invisible, as it was for me with Free Commander.

Again, with monitor #1 on the left and #2 on the right, the left monitor is pixels 0-1919, and the right monitor is pixels 1920-3839. And Windows saves window locations for programs on the basis of that desktop width running from 0-3819.

But if you swap the monitors, and #1 is now on the right with #2 on the left, the desktop width now runs from -1920 to -1 on the left monitor #2, and from 0 to 1919 on the right monitor #1. Any window previously opened onto right monitor #2 when the monitors had their original arrangement of #1-#2 will be off-screen to the right and invisible unless you pull their windows back to the left, onto new monitor #1.


I'm just saying, that rearranging monitors like this is seemingly the only plausible reason for why a program window could ever suddenly become off-screen and invisible.

Also, if you have an HDMI monitor which may not be connected and/or visible at some time, Windows may then move all of its desktop objects over to the other monitor and force that monitor to be primary #1, even if it wasn't primary #1 to begin with. This could effectively force the reversing of monitor arrangements when the HDMI monitor comes back.

If your monitor arrangement has never changed from when Windows was first installed, I can't imagine how either cursor or program windows could ever be off-screen. But if you rearrange your monitors, or have an HDMI monitor connected, I think there is exposure.

dsperber said:

If your monitor arrangement has never changed from when Windows was first installed

Never changed. Especially because I have only one monitor, and in my last Windows installation there were no other monitors not even in my room.

dsperber said:

or have an HDMI monitor connected

Nope.

Is it just me that thinks this is an imaginary problem ? Anyhow, here's how to get that much sought after 2nd phantom monitor effect.

my single display system



click detect and a white box appears



highlight that box and select 'try to connect anyway'



hey presto ! a 2nd imaginary monitor



highlight the 2nd monitor and select 'remove this display'



and you go back to square one.

BTW my mouse cursor also goes off the edge of the screen, but I don't lose any sleep over it.

Interesting.

Of course your HD5770 supports two monitors, even if you don't have a second one physically present and physically connected. I'm sure this dual-monitor card is relevant.

dsperber - the above screens were taken on my 2nd system that has a HD5450 card - DVI, VGA and something else . . and supports 3 monitors. See pic with 2 phantom displays - now that would confuse the OP.



On my main box with the HD5770, I actually have got dual display, and a 2nd monitor is the best upgrade I ever made. The HD5770 has 2 * DVI, but there seems to be many variants.

When I'm working with Cinema 4D, I have the main app on one screen and the XPresso program code on the 2nd.