The upgrade was no problem with dnf:
I used the infos from here.
sudo dnf upgrade
sudo dnf install dnf-plugin-syastem-upgrade
sudo dnf system-upgrade download --releasever=23 --best
sudo dnf system-upgrade
After the reboot into the new system, the troubles started for me. The problem is the old
Quadro FX 770M graphic card in this laptop.
The current NVidia driver 340.93 does not support the new ABI-Version of the Xorg 1.18, although
the compilation of the driver works.
After some searching I found a site, with backported xorg drivers for FC22, but this was a little problem and further searching got me to here.
The solution was also to downgrade to the Xorg 1.17 from Fedora 22 with
sudo dnf --releasever=22 downgrade xorg-x11-server-XorgThis didn't work, since the other xorg-x11-drv-* Packages requested the Xorg 1.18 from Fedora 23.
So I erased all the mentioned packages to let the Xorg-Server downgrade, but then I didn't have any keyboard and mouse after the reboot.
I logged in via ssh ( since the Gnome-Login-Screen was visble ) and installed all the xorg-x11-drv Packages also from Fedora 22
sudo dnf --releasever=22 install xorg-x11-drv- ...
After a recompile of the NVidia driver 340.93 and a reboot I got back the graphics login with keyboard and mouse :-)
[ewer@lxewer proc]$ cat /etc/*release* Fedora release 23 (Twenty Three) cat: /etc/lsb-release.d: Is a directory NAME=Fedora VERSION="23 (Workstation Edition)" ID=fedora VERSION_ID=23 PRETTY_NAME="Fedora 23 (Workstation Edition)" ANSI_COLOR="0;34" CPE_NAME="cpe:/o:fedoraproject:fedora:23" HOME_URL="https://fedoraproject.org/" BUG_REPORT_URL="https://bugzilla.redhat.com/" REDHAT_BUGZILLA_PRODUCT="Fedora" REDHAT_BUGZILLA_PRODUCT_VERSION=23 REDHAT_SUPPORT_PRODUCT="Fedora" REDHAT_SUPPORT_PRODUCT_VERSION=23 PRIVACY_POLICY_URL=https://fedoraproject.org/wiki/Legal:PrivacyPolicy VARIANT="Workstation Edition" VARIANT_ID=workstation Fedora release 23 (Twenty Three) Fedora release 23 (Twenty Three) cpe:/o:fedoraproject:fedora:23