1430746 - New tabs in private mode trigger High Performance Graphics on macOS

Status: NEW

(Core :: Graphics, defect, P3)

Description

[Richard]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:57.0) Gecko/20100101 Firefox/57.0
Build ID: 20180103231032

Steps to reproduce:

1. Open Private Browsing with Tracking Protection
2. Navigate to https://www.reddit.com/


Actual results:

Graphics card switches to discrete graphics and switches back after a few seconds.


Expected results:

No switch. This is what happens when not running in private mode and so far Reddit is the only site where it's being reproduced consistently. It also works on subreddits, comments threads etc.

Comment 1

[Ciprian Muresan [:cmuresan], Formerly of Ecosystem QA - please needinfo @mcoman for things regarding the team]

Hi Richard,

I don't have a compatible MacBook Pro to test this on, so could you please see if the issue is reproducible on a clean new profile  (https://goo.gl/AWo6h8) with and without "layers.gpu-process.enabled" set to false? You can find and change that pref in about:config.

Comment 2

[Richard]

Attachment: about:config.png

Hi,

Thanks for the reply! It's reproducible on a fresh profile, however I couldn't find that setting in about:config I only have the settings in the attached screenshot.

/Richard

Comment 3

[Milan Sreckovic [:milan] (needinfo for best results)]

Still a problem?

Comment 4

[Richard]

It is indeed.