notebook-monitor mirroring not working on Fedora 22

[Robert Moskowitz]

Thank you for responding.

On 08/13/2015 12:21 PM, killermoehre wrote:
> Am 13.08.2015 um 14:24 schrieb Robert Moskowitz:
>> I am not seeing what version of Xfce is packaged with F22 (I just built
>> this system; old system runs F21).
>>
>> Lots of things I have to figure out to get Xfce working as I want it.  I
>> forgot many of the customizations I did 6 months ago.  But formost,
>>
>> When I plug in my external monitor, I can only select laptop, monitor,
>> or 'expand to right'.  Mirroring is greyed out.
>>
>> For some reason, my Belkin KVM is only probing as 1024x768.  I have set
>> the laptop resolution at the same, but still mirroring is greyed out.
>>
>> I really need to get mirroring working before I have to connect this
>> system to a projector for a meeting...
> Hi Robert,
>
> not be able to mirror and wrong resolution sounds like a bad video driver. Xfce does nothing itself here, but only parses what RandR provides. Test with »xrandr« why your video card doesn't support mirroring and look into /var/log/Xorg.0.log which driver is loaded. Install the appropriate if not already there.

Gnome also had problems with the Belkin kvm, so it may be something 
about how Belkin resonds to display queries.

But under Fedora 21, Xfce just lowered the resolution of the laptop to 
match the resolution of the monitor and mirrored.  I did not, initally 
have to set the laptop resolution.  With this new Fedora 22 install (and 
newer version of Xfce?), it will not mirror.

What is xrandr and how do I test with it.

I THINK this Lenovo x120e is an nvidia video.