1640771 - Sharing an entire screen is shown as a cursor on a black screen to the other users / video conferencing spectators

Status: NEW

(Core :: WebRTC, defect)

Description

[Daniel Bodea [:danibodea]]

Note

• When the user engages in a video conference and attempts to share an entire screen, the other spectating participants from the call will see his cursor on a black screen. All the other elements are missing.

Affected versions

• Nightly v78.0a1
• Beta v77.0b9
• Release v76.0.1
• ESR v68.8.0esr

Affected platforms

• Ubuntu 18.04.4LTS

Steps to reproduce

1. Engage in a video conference.
2. Share your entire screen to another call participant/s.

Expected result

• The entire screen is correctly displayed to the other participants

Actual result

• The other participants see the moving cursor on a black screen

Regression range

• mozregression results:

  17:03.32 INFO: Got as far as we can go bisecting nightlies...
  17:03.32 INFO: Last good revision: a77e8f3efc4cb45b7caa0c87879910b9991b4219 (2018-12-27)
  17:03.32 INFO: First bad revision: 0cf7daf34a373c26eecab2b19baf7bff67756170 (2018-12-28)
  17:03.32 INFO: Pushlog:
  https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=a77e8f3efc4cb45b7caa0c87879910b9991b4219&tochange=0cf7daf34a373c26ee
  cab2b19baf7bff67756170

• The next part:

  17:03.32 INFO: Switching bisection method to taskcluster
  17:03.32 INFO: Getting mozilla-central builds between
  a77e8f3efc4cb45b7caa0c87879910b9991b4219 and
  0cf7daf34a373c26eecab2b19baf7bff67756170

Failed miserably by not finding any builds.

• It appears that in v66.0a1 the sharing the entire screen was implemented, but it is reproducing after the regression window above, so it might be linked to its implementation.

Additional notes

• This issue was reproduced with zoom and meet.jit.si.
• This issue will be verified on several other systems to exclude/include the possibility of a hardware related cause.

Comment 1

[Daniel Bodea [:danibodea]]

Attachment: about:support from the affected system.

This issue appears to be related to my system. I have attached the content of the "about:support" page.

Comment 2

[Daniel Bodea [:danibodea]]

Attachment: about:support from an unaffected system

I have collected the about:support information from another system with Ubuntu 18LTS that does NOT reproduce this issue; for comparison.

Comment 3

[Tim Spurway [:tspurway]]

S1 or S2 bugs need an assignee - could you find someone for this bug?

Comment 4

[Dan Minor [:dminor]]

This should be an S3 because it only affects some systems.