Bug#826636: The screensaver fails to hide the second screen in dual screen configuration

[Alex Mestiashvili]

Hi John,

I managed to reproduce the problem with a new installation.

In order to see the bug, one need to create a panel on the second screen
and place it on top or bottom.

Well this is a bit tricky, one can click on existing panel on the primary
screen, select  New Panel,
after the new panel appeared one should go to the properties of this new
panel and unselect Expand.
After that you can move it by dragging to the second screen and select
Expand again :)
If you lock your screen now you should see the effect described in the
initial report.

Shell I anyway send the script output ?

Thank you,
Alex



On Tue, Jun 7, 2016 at 11:40 AM, John Paul Adrian Glaubitz <
glaubitz at physik.fu-berlin.de> wrote:

> Control: tags -1 unreproducible
> Control: tags -1 moreinfo
>
> Hi Alex!
>
> On 06/07/2016 11:30 AM, Alex Mestiashvili wrote:
> > After upgrade from Mate 1.12.0-1 -> 1.14.1-1 the screensaver fails to
> hide
> > the second screen in dual monitor setup.
> > One can see the part which suppose to cover the second screen on the
> first
> > primary screen area. It also covers the login dialog, though one still
> can
> > un-lock the session by typing the password.
>
> I am currently sitting in front of a MATE desktop with two displays on
> Debian
> unstable and I cannot reproduce the problem. I just locked the screen and
> both screens are properly covered, both with a blank screen as screensaver
> as well as "Flying MATE". We therefore need more information to debug this.
>
> Can you make a screenshot? You should be able to do that using a script
> like:
>
> #!/bin/bash
>
> if [ -d "$1" ]; then
>     OUTPUT="$1/xdump_`hostname`.png"
> else
>     OUTPUT="xdump.png"
> fi
>
> if [ -r /var/lib/gdm/:0.Xauth ]; then
>     XAUTHORITY=/var/lib/gdm/:0.Xauth DISPLAY=:0.0 xwd -root |xwdtopnm
> 2>/dev/null |pnmtopng >$OUTPUT
>     pngcheck $OUTPUT
> elif [ -r /var/lib/gdm3/:0.Xauth ]; then
>     XAUTHORITY=/var/lib/gdm3/:0.Xauth DISPLAY=:0.0 xwd -root |xwdtopnm
> 2>/dev/null |pnmtopng >$OUTPUT
>     pngcheck $OUTPUT
> elif [ -r /var/lib/mdm/:0.Xauth ]; then
>     XAUTHORITY=/var/lib/mdm/:0.Xauth DISPLAY=:0.0 xwd -root |xwdtopnm
> 2>/dev/null |pnmtopng >$OUTPUT
>     pngcheck $OUTPUT
> elif [ -r /var/lib/lightdm/.Xauthority ]; then
>     XAUTHORITY=/var/lib/lightdm/.Xauthority DISPLAY=:0.0 xwd -root
> |xwdtopnm 2>/dev/null |pnmtopng >$OUTPUT
>     pngcheck $OUTPUT
> else
>     echo "can't access /var/lib/gdm/:0.Xauth"
>     DISPLAY=:0.0 xwd -root |xwdtopnm 2>/dev/null |pnmtopng >$OUTPUT
> fi
>
> > Here is the screen setup ( proprietary nvidia driver )
>
> Could you please re-test with the free nouveau driver? This might be
> related to
> the proprietary nVidia driver which cannot properly debug and support
> anyway
> (the sources are with nVidia).
>
> Adrian
>
> --
>  .''`.  John Paul Adrian Glaubitz
> : :' :  Debian Developer - glaubitz at debian.org
> `. `'   Freie Universitaet Berlin - glaubitz at physik.fu-berlin.de
>   `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913
>
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