1611898 - Netflix preview videos have a black crossed line visible when hovered over

Status: RESOLVED DUPLICATE of bug 1622254

(Core :: Graphics: WebRender, defect, P3)

Description

[Rares Doghi, Desktop QA]

Attachment: NetLine.jpg

[Affected versions]:
Nightly 74.0a1

[Affected platforms]:
Platforms: Windows 10

Steps :

1. Open the Firefox Browser and set the gfx.webrender.all = true in about:config
2. Reach https://www.netflix.com/browse
3. Scroll down to the Big Preview video (its not always the same video, it might change)
4. Hover over the video while it's playing.
5. Zoom out to 80% or 90% on Desktop machines (no need to zoom for laptops with small screen)

Expected Results :
The Video preview should play without any lines going through it.

Actual Results :
There is a black line going through the video.

Note: Please not that this issue occurs on Desktop PC's with Intel, AMD and Nvidia GPU's as well.
This issue only occurs with WebRender enabled.
This issue was found on a Dell 3 Laptop with Nvidia Geforce GTX 1050 gpu

Comment 1

[Jeff Muizelaar [:jrmuizel]]

Is this a regression?

Comment 2

[Rares Doghi, Desktop QA]

I managed to get a regression range for this issue:

Last Known Good Build:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=a8b8823a6b72114f4150fbcd2ab0728b833b6a04&tochange=ef5f9e04f04b648bdee5517bcbf71895acf2314e

First Known Bad Build:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=fd34209bdecb327b012f1457fc1922c93c940a5b&tochange=ef5f9e04f04b648bdee5517bcbf71895acf2314e

It seems Bug 1580104 might be the cause of it.

Comment 3

[Jeff Muizelaar [:jrmuizel]]

It seems like it's more likely to be bug 1574493 that regressed this. Rares can you confirm the regression range?

Comment 4

[Rares Doghi, Desktop QA]

I re-did the mozregression and I got the same exact results, and yes the Bug 1574493 might be the culprit here.

Comment 5

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

I hope that this will be fixed by bug 1611601.

Comment 6

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

Can you confirm whether or not this is fixed? Nightly 20200205215017 includes the fix for bug 1611601. Thanks!

Comment 7

[Rares Doghi, Desktop QA]

I rechecked this issue in build 20200205215017 and the issue still occurs.

Comment 8

[Jeff Muizelaar [:jrmuizel]]

It looks like this is a gradient that ends up repeating even when we didn't ask for that.

Comment 9

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

We have some test cases on linear gradients that are fuzzed; those are likely the places to start investigating this.

Comment 10

[Julien Cristau [:jcristau]]

Andrew, any update on this?

Comment 11

[Jessie [:jbonisteel] pls NI]

We are going to take another crack at this in the next cycle. (Note that it only impacts preview video at certain zoom levels)

Comment 12

[Julien Cristau [:jcristau]]

Thanks Jessie.

Comment 13

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

Attachment: Bug 1611898 - Match repeating tile sizes more aggresively to their snapped bounds.

Comment 14

[Phabricator Automation]

Comment on attachment 9134656 [details]
Bug 1611898 - Match repeating tile sizes more aggresively to their snapped bounds.

Revision D67620 was moved to bug 1622254. Setting attachment 9134656 [details] to obsolete.

Comment 15

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

Could you please confirm whether or not that this was fixed by the patch in bug 1622254? Thanks!

Comment 16

[Rares Doghi, Desktop QA]

Hi Andrew, This issue no longer occurs in our latest Nightly build 76.0a1 (2020-03-24), I tried this on a Desktop Pc with an Nvidia GPU GeForce GT 730 as well as on a laptop with Dual GPUs but only the Intel UHD 630 enabled and active.

Comment 18

[github.6zua]

Firefox 74 graphics aberration

This seems to be a slightly different issue than OP as its not a single line, but a screen full of raindrops.
Oddly, when doing a screencapture, the artifacts do not show, only the live screen shows.

When using FF and typically Netflix, in scenes of movement, there are artifacts around the moving sections like horizontal raindrops, very thin. Static scenes are perfectly good.

Ive tried no acceleration/recommended and other settings, started in safe mode, Plugins installed, but the issue does not change. No such issue in Chrome or ElectronPlayer.

Hardware is a Lenovo E590 Thinkpad, but clearly its not a hardware issue as it only appears in Firefox.

Comment 19

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

(In reply to github.6zua from comment #18)

Firefox 74 graphics aberration

This seems to be a slightly different issue than OP as its not a single line, but a screen full of raindrops.
Oddly, when doing a screencapture, the artifacts do not show, only the live screen shows.

When using FF and typically Netflix, in scenes of movement, there are artifacts around the moving sections like horizontal raindrops, very thin. Static scenes are perfectly good.

Ive tried no acceleration/recommended and other settings, started in safe mode, Plugins installed, but the issue does not change. No such issue in Chrome or ElectronPlayer.

Hardware is a Lenovo E590 Thinkpad, but clearly its not a hardware issue as it only appears in Firefox.

Would you mind filing a new bug about this? We definitely want to follow up on it, but it sounds unrelated.

Comment 20

[github.6zua]

Done under bug 1624754