1729233 - gfx.webrender.compositor.force-enabled results in unusable browser (mesa/nouveau)

Status: NEW

(Core :: Graphics: WebRender, defect)

Description

[Asif Youssuff]

Attachment: Screenshot from 2021-09-05 17-55-55.png

Seeing an issue where Firefox is unusable on a Thinkpad T510 and Fedora Rawhide.

Easily reproduced by setting gfx.webrender.compositor.force-enabled to true.

12:44.65 INFO: No more integration revisions, bisection finished.
12:44.65 INFO: Last good revision: e25200b8eb842563d10339edb761398c31c493c7
12:44.65 INFO: First bad revision: eb55f22378a01b4b2fd75f19069f5e344370d4a9
12:44.65 INFO: Pushlog:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=e25200b8eb842563d10339edb761398c31c493c7&tochange=eb55f22378a01b4b2fd75f19069f5e344370d4a9

Comment 1

[Asif Youssuff]

Attachment: working (good) about:support

Comment 2

[Robert Mader [:rmader]]

Thanks

Comment 3

[Robert Mader [:rmader]]

Thanks for the report! Does it work when paired with gfx.webrender.software (it should)?

Comment 4

[Laurențiu Nicola]

FWIW, it still works fine on my Radeon card.

Comment 5

[Robert Mader [:rmader]]

(In reply to Laurențiu Nicola from comment #4)

FWIW, it still works fine on my Radeon card.

Yes, it's most likely a nouveau bug or missing feature. If it's the later, then we may need to add a corresponding check, if it's a bug, then we should create a mesa issue. Or something in our code is build up on invalid assumptions - nouveau tends to be a bit special AFAIK. I should really get a nvidia device so I can test both nouveau and the prop. driver.

Comment 6

[Asif Youssuff]

(In reply to Robert Mader [:rmader] from comment #3)

Thanks for the report! Does it work when paired with gfx.webrender.software (it should)?

It does work when paired with gfx.webrender.software.

Comment 7

[Robert Mader [:rmader]]

Note to myself: this is likely because we are using the GBM platform. If we ever pick up this work again, we'd need to switch to the divice/surfacesless platform in WaylandBufferDMABUF::Create, see bug 1770407