Package: xscreensaver
Version: 5.05-3
Severity: important

At certain times when the screen is resized, xscreensaver gets
confused, and subsequently fails to blank the screen.

Specifically, this happens when changing from 640x480 to 1280x1024.
For example, if I run

xrandr -s 640x480
xrandr -s 1280x1024
xscreensaver-command -activate

xscreensaver "fades" the screen out as expected, but after doing this,
rather than showing a screensaver or a blank screen, it simply goes
back to showing the existing windows.

Furthermore, if I lock the screen at this point with
'xscreensaver-command -lock', the screen is locked, but still no
screensaver is displayed.  In fact the password-entry dialog box
appears -- over my existing windows -- in the upper left corner of the
screen rather than in the center, as if xscreensaver believes the
screen is still 640x480.

The strange thing is that this only seems to happen after switching
from 640x480 to 1280x1024.  If I switch to 640x480 and activate the
screensaver, it works fine.  If I switch from 1280x1024 to 640x480,
then to 800x600, then back to 1280x1024, it works fine.  When
switching from 640x480 to 1280x1024, though, this problem occurs every
time.

Restarting xscreensaver, or switching to (say) 800x600 and back, fixes
the problem.

This is obviously a serious problem for any user who is relying on
xscreensaver for security, not to mention those who rely on it to
protect their CRTs.

If it makes any difference, I'm using a fairly new Radeon video card
(RV635) which still doesn't have great support from the free-software
drivers; this problem occurs with both the radeon and radeonhd
drivers.

-- System Information:
Debian Release: lenny/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.26-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages xscreensaver depends on:
ii  libatk1.0-0                1.22.0-1      The ATK accessibility toolkit
ii  libc6                      2.7-13        GNU C Library: Shared libraries
ii  libcairo2                  1.6.4-6       The Cairo 2D vector graphics libra
ii  libglade2-0                1:2.6.2-1     library to load .glade files at ru
ii  libglib2.0-0               2.16.4-2      The GLib library of C routines
ii  libgtk2.0-0                2.12.11-3     The GTK+ graphical user interface 
ii  libice6                    2:1.0.4-1     X11 Inter-Client Exchange library
ii  libpam0g                   1.0.1-4+b1    Pluggable Authentication Modules l
ii  libpango1.0-0              1.20.5-1      Layout and rendering of internatio
ii  libsm6                     2:1.0.3-2     X11 Session Management library
ii  libx11-6                   2:1.1.4-2     X11 client-side library
ii  libxext6                   2:1.0.4-1     X11 miscellaneous extension librar
ii  libxinerama1               2:1.0.3-2     X11 Xinerama extension library
ii  libxml2                    2.6.32.dfsg-3 GNOME XML library
ii  libxmu6                    2:1.0.4-1     X11 miscellaneous utility library
ii  libxpm4                    1:3.5.7-1     X11 pixmap library
ii  libxrandr2                 2:1.2.3-1     X11 RandR extension library
ii  libxrender1                1:0.9.4-2     X Rendering Extension client libra
ii  libxt6                     1:1.0.5-3     X11 toolkit intrinsics library
ii  libxxf86misc1              1:1.0.1-3     X11 XFree86 miscellaneous extensio
ii  libxxf86vm1                1:1.0.2-1     X11 XFree86 video mode extension l
ii  xscreensaver-data          5.05-3        data files to be shared among scre

Versions of packages xscreensaver recommends:
ii  libjpeg-progs          6b-14             Programs for manipulating JPEG fil
ii  perl [perl5]           5.10.0-13         Larry Wall's Practical Extraction 
ii  wamerican [wordlist]   6-2.3             American English dictionary words 
ii  xli                    1.17.0+20061110-2 command line tool for viewing imag

Versions of packages xscreensaver suggests:
ii  dillo [www-browser]        0.8.6-3       Small and fast web browser
ii  elinks [www-browser]       0.11.4-2      advanced text-mode WWW browser
ii  epiphany-gecko [www-browse 2.22.3-1      Intuitive GNOME web browser - Geck
ii  fortune-mod [fortune]      1:1.99.1-3.1  provides fortune cookies on demand
ii  iceape-browser [www-browse 1.1.11-1      Iceape Navigator (Internet browser
ii  iceweasel [www-browser]    3.0.1-1       lightweight web browser based on M
ii  links2 [www-browser]       2.1pre37-1.1  Web browser running in both graphi
ii  lynx-cur [www-browser]     2.8.7dev9-1.2 Text-mode WWW Browser with NLS sup
pn  qcam | streamer            <none>        (no description available)
ii  w3m [www-browser]          0.5.2-2+b1    WWW browsable pager with excellent
pn  xdaliclock                 <none>        (no description available)
pn  xfishtank                  <none>        (no description available)
ii  xscreensaver-gl            5.05-3        GL(Mesa) screen hacks for xscreens

-- no debconf information



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