Bug 53907 – Veyon: Delay in presentation mode on teacher pc

Bug 53907 - Veyon: Delay in presentation mode on teacher pc


Summary:	Veyon: Delay in presentation mode on teacher pc

Status:	NEW

Product:	UCS@school
Classification:	Unclassified
Component:	Veyon
Version:	UCS@school 5.0
Hardware:	Other Linux

Importance:	P5 normal (vote)
Target Milestone:	---
Assigned To:	Amir Teymuri
QA Contact:

URL:
Keywords:

Depends on:	56931
Blocks:
	Show dependency tree / graph

Reported:	2021-10-14 12:04 CEST by Daniel Duchon
Modified:	2024-03-11 17:14 CET (History)
CC List:	7 users (show)

See Also:	54885
What kind of report is it?:	Bug Report
What type of bug is this?:	4: Minor Usability: Impairs usability in secondary scenarios
Who will be affected by this bug?:	3: Will affect average number of installed domains
How will those affected feel about the bug?:	5: Blocking further progress on the daily work
User Pain:	0.343
Enterprise Customer affected?:
School Customer affected?:	Yes
ISV affected?:
Waiting Support:	Yes
Flags outvoted (downgraded) after PO Review:
Ticket number:	2021101121000408, 2021101121000301, 2021101821000164, 2022050521000401
Bug group (optional):
Max CVSS v3 score:

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Description Daniel Duchon

2021-10-14 12:04:54 CEST

After switching from iTalc to Veyon, there is a delay in image transfer on a teacher PC in presentation mode.

This delay does not exist on client computers.

Comment 2 Daniel Duchon

2021-10-18 11:43:46 CEST

Another customer is facing the same issue, but now on all clients

Comment 3 Christina Scheinig

2021-10-18 11:50:29 CEST

I am not quite sure it is the same issue, but my customer reported, that it takes sometime, up to 5 minutes, to get the changes on the other screen become visible.

For the customer it is not usable.
But afaik this is not limited to the teachers PC.

Comment 5 Ole Schwiegert

2021-10-19 08:12:26 CEST

This could *potentially* be a symptom of the same problem with the Veyon proxy server described in Bug #53558

Basically the session handling in the current veyon proxy server is suboptimal and produces timeouts and delays with increasing number of clients.

Comment 7 Amir Teymuri

2022-06-28 12:13:42 CEST

Reproducing this bug is quite hard. For my initial manual tests with a small group of VMs, I couldn't notice any delays. I am going to set up a larger environment for the next test. It would be very helpful though, if meanwhile we could sort out any hardware possibilities for this problem (e.g. that it's not caused by the beamer etc.).