Installed Firefox 57.0 Quantum 64 bit stable channel on Windows 10 1709 (16299.64) on a Ryzen 7 1700 cpu with Amd Radeon Rx 570 card on a fresh gpu driver installation: W… (funda kabanzi)
Installed Firefox 57.0 Quantum 64 bit stable channel on Windows 10 1709 (16299.64) on a Ryzen 7 1700 cpu with Amd Radeon Rx 570 card on a fresh gpu driver installation: WHQL version 17.11.1
While watching videos on Youtube Firefox uses lots of gpu power: GPU clock goes up to 1200mhz while it should be 300mhz clock during full HD video decoding. This abnormal GPU usage makes the machine power hungry increasing 25-30 watt consumption while watching videos on Youtube.
Watching other video streaming services like Primevideo from Amazon causes no issue at all: full hd videos are played using GPU clocked @300mhz, normal power usage, normal gpu acceleration.
Please not that Windows 10 fall Creators Update shows low GPU usage in task manager while having issues and a quite high cpu spike (25%) during the first 10 seconds of Youtube video. I'm also experiencing video caching issues in the first streaming seconds never experienced before: I'm quite sure it isn't a network problem due to the fact that I've got no caching issues on the same sources using Edge on the same machine/network connection.
This issue is restricted to Firefox. Opening Edge on the same machine with the same scenario produces no issue at all.
Reverting back to Firefox 56.0.2 fixes the issue on Youtube (having minor glitches on random black flashing screen during the Youtube playback....again just on Youtube only and never on PrimeVideo)
GPU clock speed revealed using GPU card vendor software.
I'm using the default video codec for HTML5: OpenH264 version 1.7.1. Open to any kind of test you may need on my side