$ sudo lshw -c displayĬapabilities: msi pm vga_controller bus_master cap_list rom Ubuntu 20.04 over Linux 5.4.0-40-generic amd64 architecture. System details: Lenovo Yoga Pro 3 laptop, Mesa Intel® HD Graphics 5300 (Intel BDW GT2 chipset) Next time it occurs, I will report any clues found from dmesg. Note that the graphics jumps rather than fast-forwards once it unsticks. It makes interactive video or video playback (whether from disk or from network) unusable, as this screencast shows. However, it does not affect the mouse pointer, which continues to respond normally while the rest of the graphics is stuck. It even affects a gnome-terminal session scrolling output from sudo find /, as shown in this screencast (it normally scrolls smoothly). It seems to be purely graphics-related (and not CPU, network or swap-related), because it even affects a lone system monitor process as can be seen in this screencast of the system monitor plots sticking every 5 seconds, where you can also see how idle the CPU and network are and how much free memory and swap there is (the CPU hike is the recording process for the 30s duration of the screencast). I would be grateful if someone could point me at ways to get closer to diagnosing the problem, even if they don't have a solution. It goes away immediately after a reboot, but I have not yet noticed a pattern for what causes it to return a few days later. Since I recently installed Ubuntu 20.04 on my laptop, a few days after a reboot the graphics starts to freeze for about 1.5 seconds every 5 seconds.
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