On CentOS 7.x guest, under VirtualBox 5.2.20 and 5.2.22 (but not prior), when I maximize the VirtualBox console window (with an X session running inside) on my Windows 7 host (something I do often, as I move my console window between my two monitors), I get a notification for a Linux kern.err message saying:
Code: Select all
[drm:drm_crtc_helper_set_config [drm_kms_helper]] *ERROR* failed to set mode on [CRTC:28:crtc-0]
I do not have 2D or 3D acceleration enabled in my virtual machine settings. The
GUI doesn't load after 5.2.20 update (#18116) thread suggests that if I were able to set the new dmabuf_capable xorg.conf option to false, it might eliminate this, but the CentOS 7.x version of Xorg does not have that option at this time.