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OpenGL and WebGL hardware acceleration not working on Debian Firefox with Intel 915GM

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Dear Mozilla Supporters,

I am having issues with OpenGL and WebGL support on an older 32 bit Pentium M machine using the latest Firefox 77.0.1 and Debian 10.4 on LXQt. - GPU is Intel 915GM - kernel support is enabled - correct firmware and mesa drivers available for OpenGL 1.4, OpenGL ES 2.0 - X11 correctly initialises DRI and DRI2 with kms and SNA

Firefox about:support shows: - blacklisted OPenGL and WebGL with FEATURE_FAILURE_OPENGL_1 - WebGL 1 Driver Renderer WebGL creation failed:

  • Refused to create native OpenGL context because of blacklist entry: FEATURE_FAILURE_OPENGL_1
  • Exhausted GL driver options.

WebGL 2 Driver Renderer WebGL creation failed:

  • Refused to create WebGL2 context because of blacklist entry: FEATURE_FAILURE_OPENGL_1

HW_COMPOSITING blocked by env: Acceleration blocked by platform OPENGL_COMPOSITIFNG unavailable by default: Hardware compositing is disabled GPU_PROCESS unavailable by env: Hardware compositing is unavailable. WEBRENDER opt-in by default: WebRender is an opt-in feature WEBRENDER_QUALIFIED blacklisted by env: No qualified hardware WEBRENDER_COMPOSITOR disabled by default: Disabled by default blacklisted by env: Blacklisted by gfxInfo unavailable by runtime: No DirectComposition usage WEBRENDER_ANGLE opt-in by default: WebRender ANGLE is an opt-in feature WEBRENDER_DCOMP_PRESENT opt-in by default: WebRender DirectComposition is an opt-in feature OMTP broken by runtime: OMTP is not supported on 32-bit with <= 2 cores WEBGPU disabled by default: Disabled by default blocked by runtime: WebGPU can only be enabled in nightly

I tried many different Firefox config combinations with force_acceleration, as well as X11 with UXA, without success. I tested OpenGL support in native X11 with glxinfo and glxdemo, and hardware accelleration does work.

I believe this worked in the past without issues, I have been using the same machine on older Lubuntu and recently decided to upgrade to the latest Debian eqivalent.

Any ideas why Firefox does not see and use the OpenGL accelleration available in X11?

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