[Bug 107516] Firefox for WebGL fallbacks to swrast_dri.so, not using radeon_si.so

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107516

            Bug ID: 107516
           Summary: Firefox for WebGL fallbacks to swrast_dri.so, not
                    using radeon_si.so
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: bugs.freedesktop.org at pm.port0.org

With recent build of libdrm (2.4.93) Mozilla Firefox cannot use accelerated
WebGL, use software emulation instead.

HW. AMD RX560 and AMD WX2100 (RX550).

SW. Ubuntu 16.04 with kernels 4.17.X and 4.18.rc from
http://kernel.ubuntu.com/~kernel-ppa/mainline/, plus Oibaf's PPA builds of drm,
mesa, etc. https://launchpad.net/~oibaf/+archive/ubuntu/graphics-drivers

Symptoms. Firefox works OK, but on site with WebGL it works very slow - due to
fallback to software GL rendering.

Note. about:support page in Firefox DOES show correct driver info:
WebGL 1 Driver Renderer X.Org -- AMD Radeon Pro WX2100 (POLARIS12, DRM 3.26.0,
4.18.0-041800rc6-generic, LLVM 6.0.1)

But, on WebGL site (ex. windy.com), swrast_dri.so get loaded and eats all CPU
cores.

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