Bug#438904: xserver-xorg: Cursor at top of stacked monitor configuration shows up on both monitors

[Josh Triplett]

Brice Goglin wrote:
> Josh Triplett wrote:
>> I have a two-monitor stacked configuration.  I started a program, causing the
>> busy cursor to appear.  When I moved that cursor to the top of the upper
>> screen, hanging over the top edge, it also appeared at the top of the other
>> monitor.  I can consistently reproduce this.
> 
> And the duplicate cursor goes away as soon as you leave the top of the
> screen? "top of the screen" only means the top-most line?

"top of the screen" here means any position in which the cursor image hangs
off the top edge of the screen.  I can move several pixels down, and as long
as the cursor image still goes off the top of the screen, the phantom cursor
appears on the lower monitor.

> It doesn't occur with the non-"busy" cursor?

Not that I've observed.  However, the normal cursor cannot hang off the top
edge, because it has its hot spot at the top of the cursor image.  That may or
may not relate to the bug.

> What if the put the busy
> cursor at the top of the screen and leave it there until it becomes
> non-busy again, does the duplicate cursor go away? Or do you get two
> non-busy cursors?

It goes away.

> If you move the cursor horizontally on the top of the screen, do both
> duplicates move the same?

Yes.

>> I don't know which package causes this problem; it could represent a driver
>> bug, an X server bug, or a hardware bug.  I also don't know if it applies to
>> unstable.  The box I observed this on runs etch.
> 
> I am voting for the driver, hence reassigning to xserver-xorg-video-ati.

Works for me.

>> ii  xserver-xorg-core       2:1.1.1-21       X.Org X server -- core server
>> ii  xserver-xorg-video-ati  1:6.6.3-2        X.Org X server -- ATI display driv
> 
> It would be nice to upgrade xserver-xorg-video-ati to experimental
> (6.6.193) and/or xserver-xorg-core to testing (1.3.0). The former
> contains some cursor-related cleanups, and it should be easy to backport
> to Etch (just a couple things to change in debian/control, let me know
> if you need help). The latter will require some new libs (at least
> libdrm2) so I'll understand if you don't want to even try backporting it.

Actually, I can just check for this bug on my personal (non-work) laptop
running latest unstable; it has an ATI card as well.

- Josh Triplett

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