Closed Bug 1721009 Opened 3 years ago Closed 3 years ago

7680x2160px/GLX+EGL/Xwayland: Flickering in browser window when scrolling on latest Firefox with AMD GPU (Fixed by Nightly 92 or MOZ_ENABLE_WAYLAND)

Categories

(Core :: Graphics: WebRender, defect)

Product:
Core
Component:
Graphics: WebRender
Version:
Firefox 90
Platform:
x86_64
Linux
Type:
defect

Tracking

()

Status:
RESOLVED INCOMPLETE
Tracking Flags:
Tracking Status
firefox90 --- wontfix
firefox92 --- unaffected

People

(Reporter: bernhard, Unassigned)

References

(Blocks 1 open bug)

Details

(Keywords: correctness, regression, regressionwindow-wanted)

Attachments

(1 file)

about support output
31.89 KB, text/plain
Details

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:90.0) Gecko/20100101 Firefox/90.0

Steps to reproduce:

Running latest Firefox on an up to date Arch Linux on Wayland (GNOME).

I've got a dual monitor setup (60hz, 4k) and use an RX580 + the AMD open source GPU driver (extra/mesa 21.1.4-1). After updating to Firefox 90 I'm getting weird flickering in my browser content window when scrolling, and even more frequently when one window is playing a full screen YouTube video.

Steps to reproduce:

  1. check that gfx.webrender.force-disabled is set to false
  2. Open a full screen video on one screen
  3. Open a web page (e.g. reddit) full screen on another screen
  4. Scroll the reddit web page while playing the video

Actual results:

  1. Reddit window flickers while scrolling

Expected results:

No flickering. Setting gfx.webrender.force-disabled to true fixes this issue after a browser restart

Component: Untriaged → Graphics: WebRender
Product: Firefox → Core

Thanks for the report! Please open about:support, click on "copy text to clipboard" and paste it here.

Keywords: correctness
OS: Unspecified → Linux
Hardware: Unspecified → x86_64
Attached file about support output —

Thanks!
Background info: Your about:support says "WebRender (Software)", but that's still the default on Xwayland (bug 1696495 comment 8). You might have force-enabled hardware WebRender by setting gfx.webrender.all to true and then force-disabled it again via gfx.webrender.force-disabled=true.
Thoughts:

  1. Does this bug still occur with https://nightly.mozilla.org?
  2. Does this still occur if you start Firefox 90 with MOZ_X11_EGL=1 environment variable? (EGL instead of GLX on Xwayland)
  3. Can this be fixed by starting Firefox 90 with MOZ_ENABLE_WAYLAND=1 environment variable? (Native Wayland backend) Then we could close this as duplicate of bug 1635186.
  4. Does this still occur if you open about:config in Firefox 90, set gfx.webrender.force-disabled back to false, gfx.webrender.all to true, gfx.webrender.allow-partial-present-buffer-age to false, gfx.webrender.max-partial-present-rects to 0 and restart Firefox? (=Can bug 1677165 be affected by bug 1712969?)
  5. Please try to find a regression range, if possible:
    $ pip3 install mozregression
    $ mozregression --good 2021-02-22 --bad 2021-05-31 --pref gfx.webrender.all:true -a https://reddit.com
    You can also directly launch dates and try around:
    $ mozregression --launch YYYY-MM-DD --pref gfx.webrender.all:true -a https://reddit.com
Blocks: wr-linux
status-firefox90: --- → affected
Keywords: regression
Summary: Flickering in browser window when scrolling on latest Firefox with AMD GPU → GLX/Xwayland: Flickering in browser window when scrolling on latest Firefox with AMD GPU

Thanks for looking into it so quickly. Can confirm that the behavior is not present when running it under native wayland using

MOZ_ENABLE_WAYLAND=1 firefox
QA Whiteboard: [qa-regression-triage]

Please try providing the extra info requested in Comment 3

Blocks: wr-linux-xwayland
Severity: -- → S3
Flags: needinfo?(bernhard)

Ad 4: these flags in about:config fix the issue for me as well, will try to run the bisect? regression suite but that will probably take a bit of time.

Flags: needinfo?(bernhard)

Ad 1) 92.0a1 (2021-07-23) (64-bit) doesn't have this issue
Ad 2) MOZ_X11_EGL=1 flag does not fix it

I don't think I need to run the regression test suite if it seems to be fixed in nightly, correct?

I think it would still be useful to find the change that actually fixed it, so that we can back-port it to Beta, but it's not critical.

(In reply to Bernhard from comment #7)

Ad 1) 92.0a1 (2021-07-23) (64-bit) doesn't have this issue

If you have the time, please run this mozregression command to find out what fixed this bug (if it really has been fixed). Thanks!

$ pip3 install mozregression
$ mozregression --find-fix --bad 20210712222033 --good 2021-07-23 --pref gfx.webrender.all:true -a https://www.youtube.com/watch?v=HJp5TKNwiFo -a https://reddit.com

(Bernhard from comment #7)

Ad 1) 92.0a1 (2021-07-23) (64-bit) doesn't have this issue
Ad 2) MOZ_X11_EGL=1 flag does not fix it

I don't think I need to run the regression test suite if it seems to be fixed in nightly, correct?

Status: UNCONFIRMED → RESOLVED
Closed: 3 years ago
status-firefox92: --- → unaffected
Resolution: --- → INCOMPLETE
Summary: GLX/Xwayland: Flickering in browser window when scrolling on latest Firefox with AMD GPU → 7680x2160px/GLX+EGL/Xwayland: Flickering in browser window when scrolling on latest Firefox with AMD GPU (Fixed by MOZ_ENABLE_WAYLAND)
Summary: 7680x2160px/GLX+EGL/Xwayland: Flickering in browser window when scrolling on latest Firefox with AMD GPU (Fixed by MOZ_ENABLE_WAYLAND) → 7680x2160px/GLX+EGL/Xwayland: Flickering in browser window when scrolling on latest Firefox with AMD GPU (Fixed by Nightly 92 or MOZ_ENABLE_WAYLAND)
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