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[Otto Kekäläinen <otto@xxxxxxxx>]

There is also a question about this at
https://answers.launchpad.net/ubuntu/+source/xserver-xorg-video-
intel/+question/108987

Common to all bug reports I read is that:
- The symptom is that the mouse pointer is invisible, but the mouse still works: you can hover on stuff and click.
- The problem appears after the X mode changes (eg. while returning from blank screen, returning from suspend, changing resolutions, other fiddling with xrandr, sometimes even directly from boot).
- In some reports there are step-by-step how to reproduce while in some the cursor disappears randomly. At least is is sure that for average bug reporters it is hard to spot the pattern why/when the mouse pointer disappears.
- There are several workarounds that makes the X mode reload and thus brings the mouse back:
-- switching back and fourth to a console (Ctrl+Alt+F1, Ctrl+Alt+F7)
-- opening Gnome terminal and writing something (some other apps too, but writing in any app won't work)
- It seems that this bug is expressed on both Intel, ATI and Nvidia cards. 
- The desktop environment seems always to be Gnome. Bug #457046 might be related - there the cursor disappears because of a race condition in Gnome which makes the cursor drawn under the window.
- Different Ubuntu releases and kernel versions are affected, however in some bug reports upgrading to a new release/kernel made the problem go away. The patch in bug #614176 comment #22 seems interesting.
- Bug #595282 hints it might be a problem in how X detects the display or some interaction between xorg-server and kernel that messes the mouse pointer.
- According to bug #475917 removing the file ~/.config/monitors.xml prevents expression of the bug.


Disclaimer: kernel drivers, Xorg, xrandr, Gnome display management etc is not my expertise, so I don't know where the problem actually is. I however hope this investigation helps somebody and decreases the number of new bugs of the same issue.

If it turns out that this is now fixed in newer kernels, please backport
the fix to 10.04 LTS to increase it's stability.

-- 
Mouse cursor disappears after restarting screen (xrandr / resume)
https://bugs.launchpad.net/bugs/492782
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