DALSMC_MSG_...erEfficiency(9)

okay so the header title is DALSMC_MSG_...erEfficiency(9) and the manual name is Kernel API Manual — folded in right here near the top, bestie 🫶. This is the DALSMC_MSG_SetStutterEfficiency(9) page, and it’s lowkey all about telling PMFW what’s up with DCN stutter efficiency. Periodt ✨

💖 NAME 💖

• DALSMC_MSG_SetStutterEfficiency — literally reports DCN stutter efficiency to PMFW. That’s the function, that’s the assignment, no cap 💅

✨ SYNOPSIS ✨

DALSMC_MSG_SetStutterEfficiency

🌸 DESCRIPTION 🌸

Okay so this call informs PMFW of the current stutter utilisation for base and low-power stutter modes, so PMFW can adjust memory power policy accordingly. It’s giving “here’s the mode tea, PMFW, handle it” 🦋

• Base mode — lower enter+exit latency (PHY LP1, no UCIE LP).
• Low-power mode — higher enter+exit latency (PHY LP2, UCIE LP1).

Request fields:

• BaseEfficiencyPct[7:0] — stutter efficiency % in base mode
• LowPowerEfficiencyPct[15:8] — stutter efficiency % in low-power mode

Response: (none beyond result code) — literally nothing else in the reply, just the result code 🙈

🦋 SEE ALSO 🦋

Go look at these, bestie — all the related lore:

• Kernel file: ./drivers/gpu/drm/amd/display/dc/clk_mgr/dcn60/dalsmc.h
• DALSMC_MSG_TestMessage(9)
• DALSMC_MSG_GetMsgHeaderVersion(9)
• DALSMC_MSG_TransferTableSmu2Dram(9)
• DALSMC_MSG_SetHardMinByFreq(9)
• DALSMC_MSG_SetMinDeepSleepDcfclk(9)
• DALSMC_MSG_BacoAudioD3PME(9)
• DALSMC_MSG_ReturnHardMinStatus(9)
• DALSMC_MSG_IndicatePstateStatus(9)
• DALSMC_MSG_UpdateUTMQoSRequest(9)
• DALSMC_MSG_SetDisplayIdleOptimizations(9)
• TABLE_SOC_UTM(9)
• TABLE_DAL_INIT(9)

mwah 💖 — this page’s source/version is ./drivers/gpu/drm/amd/display/..., it’s dated October 2026, and the footer energy belongs to DALSMC_MSG_...erEfficiency(9). slay 🎀