Gareth Somerville created GUACAMOLE-1285:
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Summary: 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: 1.3.0, 1.0.0
Environment: OS: Linux, Windows; Browsers: Chrome, Opera
Reporter: Gareth Somerville
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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