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https://issues.apache.org/jira/browse/GUACAMOLE-1285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17283429#comment-17283429
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Gareth Somerville commented on GUACAMOLE-1285:
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Thanks for confirming that this is an issue with Chromium's 2D rendering. Due
to a lack of familiarity with how Guacamole works in the browser I wasn't sure,
and also didn't know how I could produce a test case.
It looks like this issue covers it
(https://bugs.chromium.org/p/chromium/issues/detail?id=1126590) and even
mentions Apache Guacamole by name in a comment on Nov 26, although if what you
say is correct, then the commenter has an incorrect explanation about what is
wrong. This duplicate issue also has a video showing exactly the rendering
artifacts I have seen in our user reports
(https://bugs.chromium.org/p/chromium/issues/detail?id=1126832).
There's a suggestion that this is resolved in Chrome 88. I've never been able
to reproduce this myself, but others on our team have, so I will catch up with
them in the morning to see if that's true.
> Poor rendering over VNC
> -----------------------
>
> Key: GUACAMOLE-1285
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-1285
> Project: Guacamole
> Issue Type: Bug
> Components: guacamole
> Affects Versions: 1.0.0, 1.3.0
> Environment: OS: Linux, Windows; Browsers: Chrome, Opera
> Reporter: Gareth Somerville
> Priority: Minor
> Attachments: image (5).png, image (6).png, image (7).png, image
> (8).png
>
>
> We currently use Guacamole to display a VNC connection from a remote Chromium
> browser running at 1920x1800 full screen.
> We began getting complaints from users in mid-late September about the
> display appearing 'blurry', and upon investigation found that this appeared
> to be that some UI elements are rendering incorrectly as shown below - this
> is most noticeable with text and causes difficulties reading, particularly at
> smaller font sizes.
> !image (5).png! !image (6).png!
> After looking for solutions, we have found that some (but not all) users have
> seen this go away when displaying the Guacamole display at full screen on a
> screen greater than or equal to 1920x1800. A more reliable, but more invasive
> fix is to disable hardware acceleration in the browser. This seems to solve
> the problem for any user that raises the issue. Below is a comparison with
> the above after disabling hardware acceleration.
> !image (7).png! !image (8).png!
> We haven't had any reports of this issue in browsers using other rendering
> engines (i.e. Firefox), so this implies that an update to that engine is what
> caused the issue. I haven't been able to narrow this down for sure, but it
> could be version 86 of Chrome where this was introduced. Due to the nature of
> the issue, it could also be related to drivers, but we have seen reports on
> both Windows and Linux, so I'm inclined to think it is the rendering engine.
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