notebook-monitor mirroring not working on Fedora 22

[Robert Moskowitz]

More information:

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.

I had to reboot to get some gvfs-mtp drivers working to access my 
Android phone, and...

The login screen was MIRRORed!

But after logging in, it switched to just the external monitor with 
mirroring greyed out.

???  Why ???