Unlock dialog does not appear occasionally in Ubuntu

[Tzafrir Cohen]

On Sun, Feb 12, 2012 at 10:53:28AM +0200, Elazar Leibovich wrote:
> This is the second ubuntu installation I'm having this problem with.
> 
> Occasionaly, after the screen is locked, the Unlock dialog does not appear,
> and thus it is impossible to log in. I see the cursor and the desktop
> wallpaper, mouse is fully functional, but I cannot login.
> 
> I resort to `service lightdm restart`, but is there a more elegant
> workaround?

Workaround: enable the keys that were disabled (by default) in the recent X11
security fix:
http://who-t.blogspot.com/2012/01/xkb-breaking-grabs-cve-2012-0064.html

It's a matter of simple xkb configuration. As for the security
implications: well, it's your foot.

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