Description of problem: From time to time I see gnome-shell is using 100% CPU after I connect my laptop to a docking station (with one monitor). Once it starts doing it, the only workaround I have is to disconnect/connect the dock. strace on gnome-shell shows lots of ioctl(DRM_IOCTL_I915_GEM_*) on /dev/dri/card0 (fd 9, see output here: https://gitlab.gnome.org/GNOME/gnome-shell/uploads/9561758e97fe97d6a89cf5b3913c0d47/out) From the libraries linked in to gnome-shell, only libdrm "knows" about /dev/dri: $ grep -l /dev/dri $(ldd $(which gnome-shell) | awk '{print $3}' | sort | uniq) /lib64/libdrm.so.2 Version-Release number of selected component (if applicable): $ rpm -qf $(which gnome-shell) gnome-shell-3.34.4-1.fc31.x86_64 $ rpm -qf /lib64/libdrm.so.2 libdrm-2.4.100-1.fc31.x86_64 How reproducible: Always (sometimes you need to wait) Steps to Reproduce: 1. Install F31 to a ThinkPad T490s laptop 2. Connect an external monitor via Dell TB16 docking station Actual results: - Hear the fan, run top, see gnome-shell using 100% CPU. strace gnome-shell shows lots of ioctl(DRM_IOCTL_I915_GEM_*) on /dev/dri/card0. Expected results: - No excessive CPU usage Additional info: I'm running Gnome on Wayland, it's Fedora 31 with latest updates, HW is a ThinkPad T490s laptop. External monitor is 3840x2160 (scaled to 1.5x). The docking station is Dell TB16.
See also: - https://gitlab.gnome.org/GNOME/gnome-shell/issues/2181
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