dc_stream_adjust_vmin_vmax(9)

💅 dc_stream_adjust_vmin_vmax(9)

okay so bestie, welcome to the Kernel API Manual ✨ this one's about dc_stream_adjust_vmin_vmax and honestly it's giving "small function, big power-savings energy" 🔋💖

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🌸 NAME 🌸

dc_stream_adjust_vmin_vmax — look up the pipe context and update parts of DRR 🎀

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✨ SYNOPSIS ✨

bool dc_stream_adjust_vmin_vmax (struct dc *dc , struct dc_stream_state
*stream , struct dc_crtc_timing_adjust *adjust );

literally the whole signature, copy-pasted with love 🫶 returns a bool, takes three pointers, we move 💅

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🦋 ARGUMENTS 🦋

• dc — your dc reference, the main character of the whole display subsystem 👑
• stream — the initial dc_stream_state, aka the stream we're about to poke at 🌈
• adjust — the updated parameters for vertical_total_min and vertical_total_max, the actual new numbers going in 📥

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💜 DESCRIPTION 💜

So what it does, fr fr: it looks up the pipe context of the dc_stream_state 🧚 and then updates the vertical_total_min and vertical_total_max of the DRR — that's Dynamic Refresh Rate, no cap — which is a power-saving feature 🍓 the whole point of DRR is targeting a lower panel refresh rate while the screen is static, so your battery doesn't get absolutely drained for no reason 😭✨

it's giving "quietly iconic efficiency move" honestly 💅

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⭐ RETURN ⭐

• true → the pipe context was found and adjusted, slay ✅
• false → the pipe context was not found, and it returns false 🙈 (nothing adjusted, bestie, vibe check failed 💀)

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🔥 SEE ALSO 🔥

• Kernel file ./drivers/gpu/drm/amd/display/dc/core/dc.c Overview(9)
• dc_stream_get_last_used_drr_vtotal(9)
• dc_stream_configure_crc(9)
• dc_stream_get_crc(9)
• dc_commit_state_no_check(9)
• dc_commit_streams(9)
• dc_check_state_update(9)
• dc_check_update_surfaces_for_stream(9)
• update_seamless_boot_flags(9)
• update_planes_and_stream_state(9)
• dc_check_address_only_update(9)
• build_dmub_cmd_list(9)
• could_mpcc_tree_change_for_active_pipes(9)
• commit_minimal_transition_state_in_dc_update(9)
• commit_minimal_transition_state(9)
• dc_update_state(9)
• dc_update_planes_and_stream(9)
• dc_enable_dcmode_clk_limit(9)
• dc_is_dmub_outbox_supported(9)
• dc_enable_dmub_notifications(9)
• dc_enable_dmub_outbox(9)
• dc_process_dmub_aux_transfer_async(9)
• dc_process_dmub_set_config_async(9)
• dc_process_dmub_set_mst_slots(9)
• dc_process_dmub_dpia_set_tps_notification(9)
• dc_process_dmub_dpia_hpd_int_enable(9)
• dc_print_dmub_diagnostic_data(9)
• dc_disable_accelerated_mode(9)
• dc_notify_vsync_int_state(9)
• dc_set_edp_power(9)
• dc_get_power_profile_for_dc_state(9)
• dc_get_det_buffer_size_from_state(9)
• dc_get_host_router_index(9)
• should_commit_intermediate_context(9)
• dc_update_probes_prepare(9)
• dc_update_probes_execute(9)

like, that's a whole friend group right there 😭 go read them too iykyk 💖

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and that's the page! 🌸 source: ./drivers/gpu/drm/amd/display/..., dated October 2026, and it's dc_stream_adjust_vmin_vmax(9) — love that for us, mwah 💋🎀