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maciejjo

Member

Registered: 2010-09-12

Posts: 21

[SOLVED] After update Firefox runs slow when screen not connected

Hi,

I am experiencing very interesting conditions afrer update to Firefox 47.
Namely, when external screen is not connected to my laptop, the whole Firefox
interface slows down terribly (with exception to one condition: when mouse
cursor is moving).

It took me some time to pinpoint when Firefox runs okay and when not, but now I
am positive that it is directly related to presence of external screen. It
looks like the whole application updates 10x less frequently than normally. It
is visible everywhere (particulary on gifs/videos, keyboard input). The only
method to get it to run smoothly is constantly move mouse cursor (even
slightly). Then whole interface is responsive again.

I created vanilla profile to check if it's related to any extension, and I was
able to reproduce the behaviour.

HW: HP ProBook 640 G1

GPU:
00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06) (prog-if 00 [VGA controller])
Kernel driver in use: i915
Kernel modules: i915

FF version: Mozilla/5.0 (X11; Linux x86_64; rv:47.0) Gecko/20100101 Firefox/47.

packages:
firefox: 47.0-1
linux: 4.6.2-1
xf86-video-intel: 1:2.99.917+662+gb617f80-1

Any ideas?

Last edited by maciejjo (2016-06-18 09:05:21)

madpierre

Member

Registered: 2016-05-27

Posts: 188

Re: [SOLVED] After update Firefox runs slow when screen not connected

Start here: Menu > Applications > Settings > Display > Refresh Rate

Slithery

Administrator

From: Norfolk, UK

Registered: 2013-12-01

Posts: 5,776

Re: [SOLVED] After update Firefox runs slow when screen not connected

Try removing xf86-video-intel.

Plenty of existing threads covering this.

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No, it didn't "fix" anything. It just shifted the brokeness one space to the right. - jasonwryan
Closing -- for deletion; Banning -- for muppetry. - jasonwryan

aur - dotfiles

maciejjo

Member

Registered: 2010-09-12

Posts: 21

Re: [SOLVED] After update Firefox runs slow when screen not connected

slithery - it works - but won't it disable HW acceleration?

Slithery

Administrator

From: Norfolk, UK

Registered: 2013-12-01

Posts: 5,776

Re: [SOLVED] After update Firefox runs slow when screen not connected

Nope. 3D acceleration is handled by mesa-libgl.

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No, it didn't "fix" anything. It just shifted the brokeness one space to the right. - jasonwryan
Closing -- for deletion; Banning -- for muppetry. - jasonwryan

aur - dotfiles

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 19,791

Re: [SOLVED] After update Firefox runs slow when screen not connected

slithery - it works - but won't it disable HW acceleration?

Expanding on slithery's answer -- The modesetting driver now works as well as or better than Intel in most situations. 
Glamor handles the 2D acceleration.

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