Confirming bug as it is reported by several users. Marking Importance as
High as this seems to be regression from Dapper for several users with
different ATI cards.
It looks like that Xorg's power managements kicks in. Can you try
disabling Xorg's PM by adding the following to you /etc/X11/xorg.conf:
Section "ServerFlags"
Option "NoPM"
EndSection
Note: if you already have "ServerFlags" section, just add Option "NoPM"
there.
This may workaround the problem for you.
** Changed in: xorg-server (Ubuntu)
Importance: Undecided => High
Status: Unconfirmed => Confirmed
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Xorg exits when it receives an ACPI button/lid event
https://launchpad.net/bugs/61746
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