What is the version number of Guacamole?
Can you try version 1.3 or 1.2 if you are using 1.5.3 or 1.4?
Is it the same symptom as I posted on Nov. 6, 2023 with Subject
"Upgrade from 1.2 to 1.4 or 1.5 Scrolling content is overwriting itself"?
On 11/14/2023 6:10 PM, Michael Jumper wrote:
On 11/14/2023 2:50 PM, M Anon wrote:
We are testing Apache Guacamole to try to address digital inequity in
our school where students who cannot afford high-end devices can
still use software like Fusion360. We have it on what we think is an
adequately powered VM (8GB RAM + 2 vCPUs). We are not running NGINX
on it because it is internal use only (students connect their devices
to the school Wi-Fi to access it) and not exposed to anywhere else.
The RDP hosts are not VMs but are physical desktops. We find that
when we connect via an RDP client directly to the physical desktop,
there is no screen tearing but when we connect to it via Guacamole,
the screen tearing is bad.
What RDP server is being used?
Our reading of the manual seems to indicate that NGINX only provides
a security layer and does not affect performance. Is this right?
That's correct.
What else can we look at to improve the situation?
Try a build of guacd from the master branch of git and see if that
improves things. That branch contains a partial implementation of
support for the "Graphics Pipeline Extension" of RDP, which *should*
eliminate the tearing.
Tearing in RDP is due to the heuristics used to detect frame
boundaries. These heuristics are necessary when the underlying
protocol lacks any means of explicitly telling Guacamole where these
frames are. Tearing occurs when Guacamole detects changes in timing
that suggest a frame boundary, but our human eyes ultimately disagree
after that frame is rendered.
Historically, RDP just sent a series of graphical updates and did not
have any mechanism to indicate to the client (Guacamole) that one
frame has ended and another is beginning. For these cases, Guacamole
relies on timing-based heuristics to detect when all data associated
with a frame has likely been received. These heuristics and inherently
best-effort guesses and will not always be correct.
This changed in newer versions of Windows and RDP with the addition of
the "Graphics Pipeline Extension" (RDPGFX). With RDPGFX, the RDP
protocol *does* have a way to tell Guacamole where frames end/begin,
and Guacamole takes advantage of this.
- Mike
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