[Pkg-xfce-devel] Bug#732854: Bug#732854: lightdm shows a part of my desktop screen as a part of the background of the login screen

[Yves-Alexis Perez]

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control: reassign -1 xserver-xorg-video-nouveau
control: forcemerge 700235 -1
On Sun, Dec 22, 2013 at 06:42:16PM +0100, Yves-Alexis Perez wrote:
> On Sun, Dec 22, 2013 at 04:54:12PM +0100, Vincent Lefevre wrote:
> > Package: lightdm
> > Version: 1.8.5-2
> > Severity: grave
> > Tags: security
> > Justification: user security hole
> > 
> > Here's what I did:
> > 1. Quit me desktop session.
> > 2. In lightdm (whose screen appeared correctly), clicked on "Restart".
> > 3. Waited for the restart, chose the default Linux kernel...
> > 
> > First lightdm seemed to be confused by the screen resolution because
> > the display of the login box didn't appear at the right place first.
> > Note that the machine is a laptop, and I use it at home with a larger
> > external screen, but since yesterday morning I'm no longer at home.
> > I wonder whether this is related (but note that in step 2, everything
> > was OK).
> > 
> > Then the login box reappeared correctly. However the background was
> > still incorrect, with parts of my desktop screen, i.e. private data
> > accessible to everyone! There was nothing really private here, but
> > there could have been a password visible or other private information
> > or whatever.
> > 
> > I'm attaching a photo I took of the laptop screen.
> 
> Looks like your graphics driver (most likely nvidia/nouveau) doesn't
> clean the video memory. Definitely not a lightdm issue.

See also #700235
- -- 
Yves-Alexis Perez
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