I've had this problem, possibly in a slightly different manner, with F23/24 and KDE. My problem might be a bit different since I have a dongle connected to my Mini-DP port that splits to two HDMI outs since I have two large external monitors. I have a VGA port on mine, but that port doesn't support the 1900x1200 resolution these monitors have.

My problem is after a reboot, the Xorg config gets all jacked up I end up having to pull the mini-DP cable from the port, let the display reset to the laptop display, then re-connect the port. Most of the time that resets all the displays so I can use them. That may be more KDE related, but it's annoying as hell.

On Wed, Sep 14, 2016 at 11:08 PM, Frederic Muller <fred@cm17.com> wrote:

On 09/14/2016 09:56 AM, Frederic Muller wrote:
> Hi!
>
> I use a X1 Carbon 3rd gen and since the latest kernel update (maybe a
> week ago) the Mini DisplayPort does not work when connected at startup.
> Sometimes I can indeed connected my external monitor once I log in and
> it works, sometimes I have to boot with the previous kernel. I haven't
> troubleshooted much but was wondering if it was just me, or other were
> seeing the same behavior.
>
> Thanks.
>
> Fred
>

Hi!

Not sure whether my post made it to the list. Got a new kernel yesterday
and same problem occurs. Any hint?

Thanks

Fred
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