Gordon Messmer wrote on 30/12/2018 20:59:
Hi, after upgrading to 7.6, kernel 3.10.0-957.1.3.el7.x86_64, at boot instead of the GUI login screen I got two lines like this:
The output you see is probably unrelated to the problem. Check the output of "systemctl status gdm" and /var/log/Xorg.0.log
Thank you! Your suggestion has been very helpful.
systemctl status gdm showed GDM running as expected, but /var/log/Xorg.0.log had many error lines like this:
(EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
The solution proposed in https://www.centos.org/forums/viewtopic.php?t=55418 was not applicable because fbdev is correctly installed.
Widening the search I found this: https://lists.debian.org/debian-x/2014/07/msg00010.html
The solution was to create a file /etc/X11/xorg.conf.d/99-fbdev-fix.conf with this content:
Section "Device" Identifier "Card0" Driver "fbdev" EndSection
And restart.