User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0
Steps to reproduce:
I have a laptop with two GPUs:
- iGPU identified as: AMD RAVEN (DRM 3.38.0, 5.8.0-rc4-10-mainline, LLVM 10.0.0) - supports VP9
- dGPU identified as Radeon RX 560 Series (POLARIS11, DRM 3.38.0, 5.8.0-rc4-10-mainline, LLVM 10.0.0) - doesn't support VP9
I tried playing a youtube video in VP9 and noticed in the log that VAAPI decode is not used.
As seen in the log, for some reason, FF tries to use my dGPU for video decoding and fails because VP9 is not supported.
I would expect that the iGPU is used by default or maybe it tries to use all GPUs before going back to CPU decoding. During this test DRI_PRIME=1 or similar is NOT set.