The graphics shows up in lspci as:
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00:02.0 VGA compatible controller: Intel Corporation Alder Lake-P Integrated Graphics Controller (rev 0c)
Other times the screen will glitch to totally black for a bit.
This effect usually lasts for 1-2 seconds before the computer returns to normal operation. The glitches don't seem to leave any errors in dmesg or journalctl. They appear most frequently when multiple programs are open and I'm trying to switch between them quickly. They happen on both X11 and Wayland desktops. Interestingly I *haven't* seen them happen when I'm using a pair of external monitors over Thunderbolt instead of the laptop monitor.
Does anyone know how to diagnose/fix this? It's so annoying that I'm considering going back to xserver-xorg-video-intel to see if they don't happen there, and just living with the seemingly worse graphics performance.