Bug#706457: looks like notifications are causing the issue

[Praveen A]

When new mail arrives thunderbird/icedove gives a notification and
that is causing the hang. Yesterday I did not notice the hang as I did
not have thunderbird running. Today I saw a new mail notification on
the locked screen but I was not able to unlock it as it had hanged.

--
പ്രവീണ്‍ അരിമ്പ്രത്തൊടിയില്‍
You have to keep reminding your government that you don't get your
rights from them; you give them permission to rule, only so long as
they follow the rules: laws and constitution.