backend/drm: fix multi-GPU buffer import failure during restoreAfterVT#263
Merged
vaxerski merged 2 commits intohyprwm:mainfrom Mar 22, 2026
Merged
backend/drm: fix multi-GPU buffer import failure during restoreAfterVT#263vaxerski merged 2 commits intohyprwm:mainfrom
vaxerski merged 2 commits intohyprwm:mainfrom
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I've tested DPMS and different monitor modes with this change, and everything seems to be working exactly as expected.
vaxerski
approved these changes
Mar 22, 2026
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Description:
Fixes an issue on hybrid multi-GPU setups (e.g. Intel iGPU + NVIDIA dGPU) where the internal display remains black/frozen after resuming from suspend (S3).
Root Cause:
During
restoreAfterVT(), the code attempts to takeSTATE.bufferand directly import it into KMS viaCDRMFB::create. On a multi-GPU setup,STATE.buffermight be allocated on the primary GPU (e.g., an NVIDIA GBM buffer withBLOCK_LINEAR_2D). Attempting to import this directly into the secondary GPU's DRM backend (Intel KMS) fails because the modifiers are incompatible.Because
restoreAfterVT()bypasses the standard multi-GPU blit pipeline, the secondary display completely fails to restore its mode.Fix:
We now check
if (!shouldBlit())before attempting the direct KMS import.If the backend requires blitting (it's a secondary GPU), we skip the direct import and add the connector to
noMode. This forces the compositor to emit a state event and correctly re-render the frame through the EGL blit pipeline, successfully restoring the display.