[Pkg-xfce-devel] Bug#564694: Bug#564694: xfdesktop4: Crash when moving desktop icons on secondary screen

[Yves-Alexis Perez]

S. Raase a écrit :
> Hello,
> 
>>> For your information, I do not use the TwinView feature for DualHead of
>>> the nvidia driver (which essentially implements some Xinerama), but
>>> instead the basic way of X11 using one server and one x-screen per real
>>> screen. These screens are completely separate.
>>
>> Then I fail to see how it can't be reproducible with another driver.
> 
> Tell me of a driver which can product two X screens on one server and
> I'll try. I've just never seen some other driver for hardware I posess.

Well, if it's not a specific feature of nvidia driver, all. If it's a
specific feature of the nvidia driver and we have no way to debug it,
end of the story.

So could you explain what exactly is the “two X screens on one server”,
how do you configure it (I guess your previously attached Xorg.conf
might help) and what exactly do you run and how. Something like a bug
report. Something with which I can work to try to reproduce the problem.
> 
>>> Anyway, I am running Debian/testing as of today, 2010-01-11. The crash
>>> has been there for at least a few days, although I have no idea when it
>>> appeared.
>>
>> What was updated during that few days? (not xfdesktop4, that's for sure)
> 
> grep "install xf" /var/log/dpkg.log* [after gunzip] tells me:
> xfce-keyboard-shortcuts in November, xfce4-clipman in October. A few
> more in September. Nothing affecting X11 since November.

I was more interested about X stuff.
> 
>>>>> I don't know how to get a backtrace, do you have some howto?
>>>> http://wiki.debian.org/HowToGetABacktrace + some help from google about
>>>> the X window system error.
>>> I do not know where xfdesktop4 is started or how to start it manually
>>> inside gdb, so this information is helpful but not useful to me.
> 
>> Then attach it using gdb -p ?
> 
> I attached three sessions with gdb, but it didn't work.
> First one is complete, the others look the same in the beginning.

Well it doesn't look really usable. Try to kill xfdesktop first, then
run it directly from gdb so you are able to break on gdk_x_error.

But, as said before, I'm not really interested with debugging on a
binary driver.


-- 
Yves-Alexis