On 2011-06-23 16:39:34 +0200, Francesco Muzio wrote: > When kdm startup and/or I logon/logoff from my desktop I see on the > screen a very strange effect: > > If I booted my machine from a cold start kdm show me, before the > login, at full screen a periodic "snow effect". I think this is the > uninitialized video memory. > > If I rebooted my machine or simply rebooted kdm or also more simply > logout from KDE I see on the screen old images (jpegs, desktops, and > other resources stores on video memory) spread on fullscreen.
FYI, I have exactly the same problem with lightdm. But it was said to be a driver bug (nouveau, in my case): https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=700235 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=732854 > This is ugly and a security problem. > If I saw something like a private or secret such as passwords, > important documents, adult content, and other things that I consider > worthy of privacy these could be displayed on the screen against our > will. FYI, this can really happen: I saw once somewhat confidential data (the answer to an ongoing competition) that reappeared on the login screen. > This problem doesn't appear with gdm. Ditto. On 2011-07-10 16:18:54 +0200, Francesco Muzio wrote: > Adding > > Section "Extensions" > Option "Composite" "0" > EndSection > > in /etc/etc/Xorg.conf > solves the issue, but the problem on KDE still remains should not > behave in this way Even the "snow effect" after a cold start? For the old images, this is not surprising since without compositing, images are drawn directly on the screen, so that they won't reappear later. For some NVIDIA cards, disabling composite is not acceptable as it is needed as a workaround to screen corruption problems. -- Vincent Lefèvre <vinc...@vinc17.net> - Web: <https://www.vinc17.net/> 100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/> Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon) -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
