rob thijssen
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Tested on the machine. With the generic Adreno firmware reachable from the
initramfs and the model-signed blob absent, the GPU gets two files in and stops:
loaded qcom/a630_sqe.fw from new location
loaded qcom/a630_gmu.bin from new location
*ERROR* Unable to load qcom/sdm850/LENOVO/81JL/qcdxkmsuc850.mbn
*ERROR* gpu hw init failed: -2
That settles a question the docs had been hedging: the zap shader is a hard
requirement, not an optimisation, and the generic pieces are necessary but not
sufficient. Getting past sqe and gmu only to die at zap is about as clean a
demonstration as the hardware will give.
Two things fall out of the same trace and are worth writing down, because
nothing upstream documents them for this machine. The driver never falls back
to the installed sdm845/a630_zap.mbn — the device tree pins the model-specific
path — and a fallback would not help anyway, since the shader is signed against
this device's own secure-boot chain. And the display survives the failure
entirely: msm_dpu still binds the panel, so a dead GPU costs acceleration
rather than a picture, and a desktop runs on llvmpipe.
Also record why these files have to travel in the initramfs at all: msm_dpu
probes around six seconds in, while the initramfs is still root, and never
retries.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XWRjNJMistCy6ngXH5aJLS