[Bug 282775] New: Mouse Cursor Bounces Rapidly Between Multiple Displays, Pretty Much Locks Up things in X

[Gary Krueger]

https://bugs.kde.org/show_bug.cgi?id=282775

           Summary: Mouse Cursor Bounces Rapidly Between Multiple
                    Displays, Pretty Much Locks Up things in X
           Product: kde
           Version: unspecified
          Platform: Fedora RPMs
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: dualhead
        AssignedTo: unassigned-bugs at kde.org
        ReportedBy: kde at cirrosoft.com


Version:           unspecified (using KDE 4.6.5) 
OS:                Linux

The mouse cursor bounces rapidly between multiple displays.  And, I'm locked
out of doing almost everything in X.

Running PNY nVidia Quadro NVS 400 PCI 64MB DDR SDRAM.  Running 3 displays
without Xinerama (each display has independent workspaces).

To recover:
- telinit 3
- top
- kill Xorg with signal 9
- telinit 5

I would ordinarily assume that it is an Xorg problem, but the problem doesn't
happen at the login screen (which has wallpaper on all 3 screens).

To hopefully reduce the recurrence of this problem, have set:
Pointer acceleration down from 2 to 1.5.
Pointer threshold up from 4 pixels to 8 pixels.

Reproducible: Always

Steps to Reproduce:
Very easily repeatable by moving mouse very rapidly across boundary between two
displays.  It then rapidly bounces on its own across the boundary.

If I move rapidly between 3 displays, it will sometimes bounce in the vicinity
of both boundaries at the same time.

Actual Results:  
After entering the undesired state, cannot do anything through any of the
displays or inputs, except:
- Move the mouse up and down the boundary, if I try real hard.
- Change display resolution (AltCtrl+ and AltCtrl-).
- Turn on and off caps lock and num lock keys.

Nothing else works:  (not even CtrlBackspace or AltCtrlDelete)

If I connect remotely, I discover that Xorg is chewing up nearly 100% CPU
cycles, and it is growing at a couple of MB per second.


Expected Results:  
It shouldn't hang.  And the mouse shouldn't get trapped.  And the Xorg process
shouldn't grow rapidly, using up CPU cycles.

Using Aya theme.
Using Oxygen widget style.
Using B II decorations.
Display 1: 3hx5w workspaces
Display 2: 4hx4w workspaces
Display 3: 3hx5w workspaces
Fedora 14
No active screen edge actions.  Explicitly disabled for upper left corner.
Disabled "Maximize windows by dragging them to the top of the screen"
Disabled "Tile windows by dragging them to the side of the screen"
Not using Compiz.
All displays set to 1280x1024.  One display can do a higher resolution, but
chose this lower resolution to keep them consistent to eliminate resolution
mismatches as a cause.
Right handed mouse.
Single click to open files and folders.

It is data loss, because I have to restart the X server.  And the other windows
are starved for CPU cycles, so they stop accomplishing anything.  And then, I
have to "kill -9".  So, it pretty much forgets what I was doing.

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