1738816 - Raspberry Pi 4: Hardware rendering becomes broken after a few seconds. It can be fixed with gfx.webrender.pbo-uploads=false.

Status: RESOLVED WORKSFORME

(Core :: Graphics: WebRender, defect)

Description

[Darkspirit]

Attachment: aboutsupport.txt

SoC: BCM2711B0

• CPU: ARM Cortex-A72
• GPU: Broadcom VideoCore VI

Comment 1

[Darkspirit]

Attachment: Screencast from 11-02-2021 01:33:26 AM.webm

Comment 2

[Darkspirit]

Attachment: Screencast from 11-02-2021 01:34:02 AM.webm

Comment 3

[Darkspirit]

Attachment: Screencast from 11-02-2021 01:34:45 AM.webm

Comment 4

[Darkspirit]

Attachment: Screencast from 11-02-2021 01:35:26 AM.webm

Comment 5

[Jim Blandy :jimb]

Guessing that Glenn should look at this, because of the pbo-uploads connection.

Comment 6

[Glenn Watson [:gw]]

I don't have much knowledge of that part of the WR code, perhaps Nical or Jamie might know more?

Comment 7

[Jeff Muizelaar [:jrmuizel]]

It seems like this is likely an upstream bug. Darkspirit can you file a mesa issue and link to it from here?

Comment 8

[Darkspirit]

bug 1725624 was filed for the "OpenGL" compositor.
https://gitlab.freedesktop.org/mesa/mesa/-/issues/4620 was filed for WR 87/Wayland/Raspberry Pi4, but it looks different from what I'm seeing.
The only way to test I know of is manually downloading an infrequent autoland Tier 2 Linux Aarch64 opt build.
I need to test older Nightly versions and I also need to find out how to test latest Mesa.

Comment 9

[Darkspirit]

General UI glitch/flickering doesn't seem to occur anymore when force-enabling HW WR.
But there is a video color glitch: bug 1784327