1569745 - [WebRender] Gnome/Wayland: When snapping windows, sometimes they become "perforated": full of transparent holes

Status: RESOLVED WORKSFORME

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

Description

[Michael Cooper [:mythmon]]

Attachment: Screenshot from 2019-07-29 12-34-51.png

When I snap windows to the side using the Gnome keyboard shortcuts, sometimes the window becomes "perforated". It has many transparent holes that are static in the window. I can see other applications through them, and moving the window doesn't affect them. Snapping the window in other ways makes them go away sometimes. I've attached a screenshot of the issue.

Other things to note:

• Other applications on my system aren't doing this
• The perforations extend into the title bar of windows that have one, like the Browser Console
• I am using WebRender
• I am using Intel graphics
• I am using Nightly build ID 20190729095501
• I am using Wayland
• I have my desktop set to a scaling factor 150%

Comment 1

[Jessie [:jbonisteel] pls NI]

Has this been happening for awhile now or did it just start recently?

Comment 2

[Michael Cooper [:mythmon]]

This just started happening today.

Comment 3

[Jessie [:jbonisteel] pls NI]

I have taken a look through that build, nothing suspicious is jumping out at me. If you can repro easily, can you run mozregression?

Comment 4

[Michael Cooper [:mythmon]]

Mozregression points to this push which contains only one bug: bug 1489097. I'm surprised by that, because this problem definitely started less than 11 months ago. Perhaps something changed on my system recently that triggered this.

Comment 5

[Jessie [:jbonisteel] pls NI]

Have you tried turning WebRender off to see if this still happens? Just curious.

Comment 6

[Darkspirit]

Please test

• Basic: gfx.webrender.force-disabled;true layers.acceleration.force-enabled;false (restart needed)
• OpenGL: gfx.webrender.force-disabled;true layers.acceleration.force-enabled;true (restart needed)

I assume it happens with "OpenGL", too.

Comment 7

[Michael Cooper [:mythmon]]

Your assumption is correct. "Basic" does not reproduce this problem, but "OpenGL" does.

Comment 8

[Darkspirit]

Then it's likely the same as bug 1502519, but with Gnome-specific appearance.
This bug sometimes also causes some WebRender tiles to become broken: bug 1518796

Comment 9

[Darkspirit]

The similar looking screenshot bug is also Gnome/Wayland: bug 1494520.

Comment 10

[Darkspirit]

bug 1560776 was basicially the same, but with a different regression range (bug 1557265) and it was no longer reproducible after a driver downgrade.

Comment 11

[B.J. Herbison]

This type of display is similar some of the symptoms I have been seeing for the past three months on Ubuntu/XFCE. See the second image attached to bug 1547964.

Comment 12

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

This comes from gfx drivers - see the correct Firefox rendering which is broken randomly.

Comment 13

[Liz Henry (:lizzard) (relman/hg->git project)]

Happy to take a patch for 70 or beyond.
Since we are getting close to the end of the 69 beta cycle and this is set to P3, I'm marking it fix-optional for 69 and 70 to remove it from weekly triage.

Comment 14

[Robert Mader [:rmader]]

Michael, is this still reproducible for you?

Comment 15

[Michael Cooper [:mythmon]]

I just stopped using Gnome+Wayland last week, so I can't be sure. However, I haven't seen this problem in a long time, so it is probably safe to assume it isn't reproducible anymore.

Comment 16

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

Okay, Thanks.