Frédéric Bron composed on 2017-06-28 09:36 (UTC+0200):
> Have you already done a distro-sync
.
just done, no change
.
> or tried uninstalling sddm before trying
> startx? KDM still works
.
not yet, should I just do this?
$ dnf remove ssdm*
$ dnf install kdm
.
I would do only the first, then reboot, then try startx before proceeding to
install kdm. Given below, I don't believe sddm is your problem or that kdm would
help.
.
> Have you already tried uninstalling the nouveau driver?
.
should I do this?
$ dnf remove nouveau*
.
That would be dnf remove xorg-x11-video-nouveau, but see below first.
.
> If nothing else has helped as yet, provide hardware information:
.
Here some first information:
.
laptop DELL XPS15 9550
.
$ lspci -nnk|grep -A5 VGA
0:02.0 VGA compatible controller [0300]: Intel Corporation HD Graphics
530 [8086:191b] (rev 06)
Subsystem: Dell Device [1028:06e4]
Kernel driver in use: i915
Kernel modules: i915
00:04.0 Signal processing controller [1180]: Intel Corporation Skylake
Processor Thermal Subsystem [8086:1903] (rev 07)
Subsystem: Dell Device [1028:06e4]
.
Your other thread indicated you have NVidia gfx, confirmed by looking at
http://laptoping.com/specs/product/dell-xps-15-9550/ (Skylake) so it looks like
you need to but have not utilized this doc:
https://fedoraproject.org/wiki/Bumblebee
That lspci -nnk | grep -A5 probably should have been -A12 or so. Try instead
'dnf install inxi; inxi -c0 -G'.
Plasmashell seems might be thinking both displays are currently connected and it
is trying to use the disconnected display, due to an inappropriate driver and/or
laptop firmware configuration, or defective firmware in need of update.
If it was here, first thing I would try is adding the following to
~/.config/kded5rc:
[Module-kscreen]
autoload=false
just to see if it stops the black. It's a troubleshooting option, not something
to keep permanently unless you plan to manually configure multiple displays
through a startup xrandr script or xorg.conf*.
Is linux-firmware installed?
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