[Webkit-unassigned] [Bug 187696] New: [GTK] Epiphany causes high, and perhaps excessive GPU load

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=187696

            Bug ID: 187696
           Summary: [GTK] Epiphany causes high, and perhaps excessive GPU
                    load
           Product: WebKit
           Version: Other
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: brisse at outlook.com
                CC: bugs-noreply at webkitgtk.org

I have two Sapphire Nitro R9 Fury graphics cards with fans that normally turn off during low load, such as when browsing the web. However, with Epiphany, I noticed fans would start spinning every now and then, so I looked at GPU load, temps and power consumption on my primary card. Take a look at vddgfx, temp1 and power1 compared to when I'm using Firefox:

Firefox 61 (with OpenGL compositing forced on, it's off by default)

amdgpu-pci-0900
Adapter: PCI adapter
vddgfx:       +0.93 V
fan1:         774 RPM
temp1:        +67.0°C  (crit = +89.0°C, hyst = -273.1°C)
power1:       19.00 W  (cap = 260.00 W)

Epiphany 3.28.2

amdgpu-pci-0900
Adapter: PCI adapter
vddgfx:       +1.25 V
fan1:         751 RPM
temp1:        +76.0°C  (crit = +89.0°C, hyst = -273.1°C)
power1:       59.00 W  (cap = 260.00 W)

While offloading work to a GPU can be a good thing, this does seem excessive to me. I can imagine this would hurt battery life quite a bit if this was a mobile device.

In this specific test case I had one tab open with a YouTube-video playing, but pretty much any website shows similar result.

I am running a Wayland session on Debian Sid with GNOME 3.28.2

screenfetch -n
 kristoffer at kristoffer-debian-desktop
 OS: Debian unstable sid
 Kernel: x86_64 Linux 4.17.0-1-amd64
 Uptime: 3h 2m
 Packages: 1980
 Shell: bash 4.4.23
 Resolution: 2560x1440
 DE: GNOME 
 WM: GNOME Shell
 WM Theme: 
 GTK Theme: Adwaita [GTK2/3]
 Icon Theme: Adwaita
 Font: Cantarell 11
 CPU: AMD Ryzen 7 1700X Eight-Core @ 16x 3.4GHz [46.6°C]
 GPU: AMD Radeon (TM) R9 Fury Series (FIJI, DRM 3.25.0, 4.17.0-1-amd64, LLVM 6.0.1)
 RAM: 3246MiB / 32167MiB

Original bug report: https://gitlab.gnome.org/GNOME/epiphany/issues/74

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