1863653 - [X11][Ubuntu] Online video cut off on Firefox explorer after Lid close with external monitor connected via Dell dock

Status: RESOLVED WONTFIX

(Core :: Widget: Gtk, defect, P3)

Description

[hugh712]

Steps to reproduce:

1.Boot to Ubuntu OS,Connect a external 4K monitor via Type-C port or WD22TB4 Dock [0].
2.Open Firefox and play a online video.Move the video page to external monitor and change mode to full screen.
3.Close Lid->Online video show cut off on external monitor.

[0] https://www.dell.com/en-us/shop/dell-thunderbolt-dock-wd22tb4/apd/210-bdqh/docks-and-stands

Actual results:

Online video cut off on Firefox explorer after Lid close with external monitor connected.

Expected results:

Online video on Firefox explorer show normal after Lid close with external monitor connected.

Comment 1

[hugh712]

This issue only can be reproduced with QHD (Default scale 200%) but not in FHD(Default scale 100%)
And can not reproduced in Chromium web browser and default Ubuntu "Videos" Player

Comment 2

[BugBot [:suhaib / :marco]]

The Bugbug bot thinks this bug should belong to the 'Core::Audio/Video: Playback' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 3

[Martin Stránský [:stransky] (ni? me)]

What do you mean by 'cut off' ? The video playback stopped, external screen is black or what exactly happens?

Comment 4

[hugh712]

Attachment: the video with the symptom

the video with the symptom

Comment 5

[hugh712]

Hi Martin,

upload the video which with the symptom, thank you.

Comment 6

[Martin Stránský [:stransky] (ni? me)]

So the playback continues but with 1/2 of window size, right? Please attach your about:support page.
Thanks.

Comment 7

[hugh712]

So the playback continues but with 1/2 of window size, right?
--> Yes.
Please attach your about:support page.
--> I'm sorry, I'm not sure what this is, what is "about:support page"?

Comment 8

[Martin Stránský [:stransky] (ni? me)]

(In reply to hugh712 from comment #7)

Please attach your about:support page.
--> I'm sorry, I'm not sure what this is, what is "about:support page"?

Open about:support web page from URL bar. It's a special page with Firefox config.

Comment 9

[hugh712]

Attachment: about:support page

Comment 10

[hugh712]

Attachment: Troubleshooting Information.pdf

Comment 11

[Martin Stránský [:stransky] (ni? me)]

Which distro is that? You may try to run Firefox under Wayland:
https://fedoraproject.org/wiki/How_to_debug_Firefox_problems#Testing_Mozilla_binaries
Thanks.

Comment 12

[hugh712]

It's ubuntu 22.04, and sure, I will try:

MOZ_ENABLE_WAYLAND=1 ./firefox -ProfileManager -no-remote

Comment 13

[hugh712]

Hi Martin,

The system we are using the default is already running under wayland,
May I know is there any different to have a parameter like "MOZ_ENABLE_WAYLAND=1" under wayland environment?

Comment 14

[Martin Stránský [:stransky] (ni? me)]

about:support page should say "wayland" and not "xwayland". xwayland is X11 emulation on top of Wayland. Wayland will become default in Firefox 121.0.

Comment 15

[hugh712]

Hi Martin,

I confirmed that run with wayland mode can fix this issue,
so may I ask that is that mean currently it still needs to use parameter on firefox to divert wayland and X11?

Comment 16

[hugh712]

oh, I see --> Wayland will become default in Firefox 121.0.

Comment 17

[hugh712]

Hi Martin,

Ubuntu is using snap version of firefox,
121.0 is currently in candidate channel, will land into stable soon,
and since this is fix in 121.0, so let's close this issue, thanks for your support :)

Comment 18

[Martin Stránský [:stransky] (ni? me)]

It may be variant of Bug 1869724.

Comment 19

[Martin Stránský [:stransky] (ni? me)]

We can't fix X11 behavior here so closing.
Thanks.