This is relevant:

Extended renderer info (GLX_MESA_query_renderer):
    Vendor: Intel Open Source Technology Center (0x8086)
    Device: Mesa DRI Intel(R) HD Graphics 4000 (IVB GT2) (0x166)
    Version: 20.0.8

My guess is that Google is blacklisting this GPU, for some reason.

Can you try running chrome/chromium with --ignore-gpu-blacklist, and let
us know whether chrome://gpu reports that compositing is hardware-
accelerated?

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to chromium-browser in Ubuntu.
https://bugs.launchpad.net/bugs/1899270

Title:
  Chrome on Ubuntu, press F11 for full screen and the message flashes
  continuously

Status in chromium-browser package in Ubuntu:
  Confirmed

Bug description:
  After pressing F11 there's a text box at the top of the screen with
  the message Press F11 to Exit, etc. Usually this goes away by itself
  after a few seconds. Now it flashes continuously and won't clear.
  Pressing F11 again quits full screen mode, but the tab is still
  flashing in some way and the whole browser is now unstable and not
  usable.

  Chrome: Version 86.0.4240.75 (Official Build) (64-bit)
  System: Ubuntu Studio, 
  Distributor ID:       Ubuntu
  Description:  Ubuntu 20.04.1 LTS
  Release:      20.04
  Codename:     focal

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/chromium-browser/+bug/1899270/+subscriptions

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