Description of problem:
After I boot a machine just turned on (power disconnected before), the lightdm background looks somewhat corrupted, containing mostly black, but some pixels in bright colors.
If I login to a session, then exit the session with a reboot, as soon as lightdm turns up the background now displays fragements of my screen from the session from BEFORE THE REBOOT! How freaking scary is that?
Just think about it, if I enter a password in the terminal in cleartext for some reason, it is now displayed to whoever rebooted the machine!
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. login to a session
2. browse a little bit with firefox
3. from session, reboot
4. after reboot, watch lightdm background
it displays various fragments of the session from before reboot, from firefox as well as from the desktop
it displays /usr/share/backgrounds/default.png as configured in /etc/lightdm/lightdm-gtk-greeter.conf
how is this even theoretically possible given that linux is supposed to zero pages before mapping? http://permalink.gmane.org/gmane.linux.kernel.kernelnewbies/40544 Does a different policy apply to graphics memory?
One would assume it's hard and takes lots of effort to get information from other processes. This keeps the information over a reboot. And conveniently displays it. Scary stuff.
Someone claims at
that this is a longstanding X11 bug?
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