1768803 - GPU power usage increase when playing video in fullscreen

Status: RESOLVED WONTFIX

(Core :: Graphics, defect, P3)

Description

[[e-mail]]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:100.0) Gecko/20100101 Firefox/100.0

Steps to reproduce:

• open a video on youtube (eg https://www.youtube.com/watch?v=KwpdmSKgMkY, 4K60 will make the difference more obvious)
• open a tool to monitor your gpu power
• play video and check gpu power
• go fullscreen and check gpu power
• quit fullscreen and check gpu power

Actual results:

For no reason GPU power usage is higher when playing the video in fullscreen.

Expected results:

The GPU power usage should stay the same whether you're playing video fullscreen or not.

Bonus information : I've find a way to kinda fix it !
When firefox lose focus for some reasons the GPU power go back to normal.
You can see in the attached video I use a tool called LibreHardwareMonitor to monitor power, when I click on it firefox loses keyboard focus and power go down, when I re-click on firefox power go up again.

Comment 1

[[e-mail]]

Attachment: demo of power usage changing when getting/losing focus

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::Graphics' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 3

[Sotaro Ikeda [:sotaro]]

[e-mail], thank you for reporting. Can you attach about:support to this bug? Does the problem happen with Firefox nightly?

Comment 4

[[e-mail]]

Attachment: about support.txt

(In reply to Sotaro Ikeda [:sotaro] from comment #3)

[e-mail], thank you for reporting. Can you attach about:support to this bug? Does the problem happen with Firefox nightly?

I just tried the latest Nightly with a new profile and no extension installed whatsoever, the bug is still present.
Also I forgot to mention that it was already there a few versions ago, through I don't know if it was triggered by a Firefox, Windows or AMD update.
And my GPU doesn't have hardware VP9 decoding.

Comment 5

[[e-mail]]

Ok, I tested with Google Chrome out of curiosity and they have the exact same bug which react the exact same way on focus loss, so it might be a Windows issue after all.

Comment 6

[C.M.Chang[:chunmin]]

This seems a graph issue for me. According to comment 5, this probably is not a Firefox bug

Comment 7

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

Sounds like there is nothing to be done / this can be closed as WONTFIX, but needinfo'ing sotaro in case he thinks otherwise.

Comment 8

[Sotaro Ikeda [:sotaro]]

Closed as WONTFIX from comment 5.