[Pkg-xfce-devel] Bug#860925: Bug#860925: xfce4: laptop external monitor wallpaper stuck in tiled default

David Christensen dpchrist at holgerdanske.com
Sun Apr 23 02:10:31 UTC 2017

On 04/22/2017 02:06 AM, Yves-Alexis Perez wrote:
> On Fri, 2017-04-21 at 16:11 -0700, David Christensen wrote:
>> Please advise.
> This is not a Debian support list.

Understood.  I am reporting a bug because my post to the debian-user 
mailing list produced one response that didn't explain the problem and 
described an overkill solution for a different make and model computer.

Do you know of a better Debian support list?

> This doesn't look like a wallpaper problem
> but rather a display resolution detection issue.

I have seen EDID error messages in dmesg(1) with this and other 
computers, mostly under Wheezy.  Bypassing the KVM eliminated those 
problems.  Under Jesse, I see few to no EDID error messages with this 

2017-04-22 19:08:23 dpchrist at jesse ~
$ dmesg | grep -i edid

2017-04-22 19:08:27 dpchrist at jesse ~

> Try to set the correct
> resolution on the external screen.

The external monitor was set correctly prior to the bug, after the bug, 
with the KVM connected, and with the KVM bypassed:

Application Menu -> Settings -> Display:

Use this output		checked

Resolution		1920x1080

Refresh rate		60.0 Hz

Rotation		Normal

Reflection		None

> Try to remove the KVM, some of which are
> known to provide fake EDIDs and break detection.

Behavior is the same when the laptop is powered down, KVM bypassed, and 
the laptop is powered up and booted.

It is interesting to note that the image displayed is the same image as 
the graphical login manager, and does not appear under the list of 

Application Menu -> Settings -> Desktop -> Background -> Images

I have attached a logged in screenshot FYI.


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