1800175 - Hardware support disabled by default but only on Wayland (on XOrg works fine)

Status: UNCONFIRMED

(Core :: Graphics: WebRender, defect)

Description

[[:white_wolf]]

Attachment: firefox_01.png

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Firefox/102.0

Steps to reproduce:

1. Open Firefox on Debian 11 (Firefox 102.4.0esr)
2. Launch videos on YouTube

Actual results:

Low frame rate during playing any videos and poor quality (low resolution).
I checked in "about:support", that "Compositing" is set as "WebRender (Software)"(attachment firefox_01.png). It's mean, that hardware support for decoding videos is disabled. But, after switching from Wayland to XOrg, everything working fine. After switching to Wayland again, I manually set gfx.webrender.all to true. Now everything works fine.

Expected results:

"Compositing" should be set as "WebRender" on default, but on Wayland is not.

Comment 1

[:Gijs (he/him)]

I assume the security checkbox was set by mistake.

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

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

Comment 3

[[:white_wolf]]

(In reply to :Gijs (he/him) from comment #1)

I assume the security checkbox was set by mistake.

Of course. I'm sorry. My fault

Comment 4

[Jeff Muizelaar [:jrmuizel]]

Can you attach the entire Graphics section of about:support?

Comment 5

[[:white_wolf]]

Attachment: Graphics section of about:support

Comment 6

[[:white_wolf]]

(In reply to Jeff Muizelaar [:jrmuizel] from comment #4)

Can you attach the entire Graphics section of about:support?

Yes, of course. I have already added it to the "Attachments" section.
Best Regards

Comment 7

[Jeff Muizelaar [:jrmuizel]]

Can you try Firefox Nightly and attach the Graphics section of about:support?

Comment 8

[[:white_wolf]]

Attachment: Graphics section of about:support - from Nightly

Comment 9

[[:white_wolf]]

(In reply to Jeff Muizelaar [:jrmuizel] from comment #7)

Can you try Firefox Nightly and attach the Graphics section of about:support?
Hi
I have added another doc: "Graphics section of about:support - from Nightly" in Attachments section. I don't know how to switch language to English, so document is in Polish. If there is a problem, please let me know how set language to English.
Best regards

Comment 10

[Jeff Muizelaar [:jrmuizel]]

Andrew, it's not clear to me from the about:support what's going on. Do you have an interpretation? Can we make it clearer?

Comment 11

[Darkspirit]

User's info:

• Mesa 20 (Debian 11 = stable = https://packages.debian.org/bullseye/libegl-mesa0), Xwayland, GLX, SW WR.
• The user's Firefox ESR 102.4.0 is newer than Debian's firefox-esr 91.13.0.

The reason why HW WR is blocked for GLX/Xwayland is bug 1635186 comment 49:
Switching to EGL and RenderCompositorEGL fixed that Xwayland bug, therefore EGL is required for HW WR on Xwayland.
Mesa 21 is required for HW WR on Xwayland because Mesa 21 is required for X11_EGL. It could be lowered.
https://searchfox.org/mozilla-central/rev/3d01e045479a6e5237958bd9aa8eb64306e1f48a/widget/gtk/GfxInfo.cpp#745

Other relevant Xwayland bug:
EGL partial present has been broken below xwayland 1.20.10 (Mesa version doesn't matter): bug 1677892
Debian stable has the fix: xwayland 1.20.11 https://packages.debian.org/stable/xwayland

I assume the Mesa version requirement for xwayland and X11_EGL could be lowered from Mesa 21 to Mesa 20 if I haven't forgotten another bug.

Supported GL version seems high enough:

WebGL 1: 3.0 Mesa 20.3.5
WebGL 2: 3.3 (Core Profile) Mesa 20.3.5

EGL requires OpenGL 3.2 core or GLES 3.

Comment 12

[Darkspirit]

(In reply to [:white_wolf] from comment #0)
To enable hardware rendering on Xwayland on Mesa 20, open about:config, set gfx.webrender.all to true, gfx.x11-egl.force-enabled to true, restart Firefox.

Comment 13

[[:white_wolf]]

(In reply to Darkspirit from comment #12)

(In reply to [:white_wolf] from comment #0)
To enable hardware rendering on Xwayland on Mesa 20, open about:config, set gfx.webrender.all to true, gfx.x11-egl.force-enabled to true, restart Firefox.

Hi. Thanks for the reply.
I know the way how to fix it manually, but I'm wondering why hardware support for WebRendering is disabled by default in this scenario.
Best Regards

Comment 14

[Darkspirit]

comment 11 contained the full explanation:

• EGL_X11 is blocked for Mesa 20 (>=Mesa 21 was an arbitrary limit), therefore GLX is used.
• EGL is required for HW WR on Xwayland to avoid bug 1635186 comment 49, therefore SW WR is used.

Comment 15

[Jeff Muizelaar [:jrmuizel]]

So that changes my question for aosmond. The new question is: Shouldn't "FEATURE_FAILURE_WEBRENDER_BUG_1635186" or some better explanation show up in the about:support as the reason things are disabled?

Comment 16

[[:white_wolf]]

(In reply to Darkspirit from comment #14)

comment 11 contained the full explanation:

• EGL_X11 is blocked for Mesa 20 (>=Mesa 21 was an arbitrary limit), therefore GLX is used.
• EGL is required for HW WR on Xwayland to avoid bug 1635186 comment 49, therefore SW WR is used.

Hi
That explains everything.
Thank you all.
Best

Comment 17

[Andrew Osmond [:aosmond] (he/him)]

Appears to be a regression of bug 1625474. I will file a bug about fixing this.

Comment 18

[Andrew Osmond [:aosmond] (he/him)]

(In reply to Andrew Osmond [:aosmond] (he/him) from comment #17)

Appears to be a regression of bug 1625474. I will file a bug about fixing this.

Actually I am not sure now....