sty 20 11:11:56 localhost.localdomain /usr/libexec/gdm-x-session[2206]: (EE) modeset(0): present flip failed sty 20 11:11:56 localhost.localdomain /usr/libexec/gdm-x-session[2206]: (EE) modeset(0): Failed to get GBM bo for flip to new front. sty 20 11:11:56 localhost.localdomain /usr/libexec/gdm-x-session[2206]: (EE) modeset(0): present flip failed sty 20 11:11:56 localhost.localdomain /usr/libexec/gdm-x-session[2206]: (EE) modeset(0): Failed to get GBM bo for flip to new front. sty 20 11:11:54 localhost.localdomain /usr/libexec/gdm-x-session[2206]: (EE) modeset(0): present flip failed sty 20 11:11:54 localhost.localdomain /usr/libexec/gdm-x-session[2206]: (EE) modeset(0): Failed to get GBM bo for flip to new front. Lenovo Yoga 460, Intel HD Graphics 520, 4.19.15-300.fc29.x86_64 GNU/Linux Problem don't exist in GNOME session.
This is an xserver issue, not xfce: https://gitlab.freedesktop.org/xorg/xserver/issues/68 Fixed with: https://gitlab.freedesktop.org/xorg/xserver/merge_requests/193 With a MR to backport it to xserver-1.20: https://gitlab.freedesktop.org/xorg/xserver/merge_requests/210 Those issue shows because xfwm4 (can optionally) use Xpresent for vblank synchronisation, that GNOME doesn't use, but that doesn't make it an xfce issue though. For mitigation, until a version of the xserver with the fix is made available for your distribution, you can either switch to glx as vblank synchronization or disable vblank synchronisation altogether. Closing this bug as invalid (for xfce).