[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #25 from Barto (mister.freeman at laposte.net) ---
Someone has made a suggestion to me : go to "about:support" in firefox for
ckecking some options, I can read this :

HW_COMPOSITING  blocked by default: Acceleration blocked by platform

OPENGL_COMPOSITING      unavailable by default: Hardware compositing is
disabled

WEBRENDER       opt-in by default: WebRender is an opt-in feature
unavailable by runtime: Build doesn't include WebRender

and this guy told me to check if the property
"layers.acceleration.force-enabled" is set to true in firefox ( in
"about:config" section ),

I checked and it was set to false by default, so I set it to true and I
restarted firefox,

and now there is no lag in firefox for youtube video 1080p at 60 fps with kernel
4.15rc8

but this advice seems to be a "cheat mode/workaround", it doesn't explain why
your commit triggers this problem with firefox 57 when
"layers.acceleration.force-enabled" option is disabled in firefox ( which is
the default value ),

with kernel 4.14.14 ( and when I revert your commit ) youtube video plays
without lags, even if "layers.acceleration.force-enabled" is disabled

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