It's probably more likely to be a video driver, Xorg or kernel issue
rather than GDM
** Package changed: gdm (Ubuntu) => xorg-server (Ubuntu)
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Cannot login after resume from suspend
https://bugs.launchpad.net/bugs/504496
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Des
** Attachment added: "Dependencies.txt"
http://launchpadlibrarian.net/37598025/Dependencies.txt
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Cannot login after resume from suspend
https://bugs.launchpad.net/bugs/504496
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Desktop Bugs, which is subscribed to gdm in ub