ENUM DMUB_ABM_HISTOGRAM_TYPE(9)

📦 version 7.3.1, in nixpkgs unstable

💅 enum dmub_abm_histogram_type(9) 🎀

okay so bestie, we're deep in the Kernel API Manual today — like, deep deep, the kind of deep where the header gets truncated to enum dmub_ab...stogram_type(9) because the name is lowkey too long for the page ✨. Yes, that's the actual title up top. No cap.

This one's a little baby page — a single enum — but it's living in a very busy neighborhood, and we're gonna cover it all. 🫶

✨ NAME ✨

enum dmub_abm_histogram_type — the histogram type. that's it. that's the whole description. it's giving "minimalist icon" 💅

🌸 SYNOPSIS 🌸

enum dmub_abm_histogram_type {
    ABM_HISTOGRAM_TYPE__SW ,
    ABM_HISTOGRAM_TYPE__SW_IF

};

look at her go. two members, one trailing comma situation, and a whole lot of __ energy. slay. 🔥

🦋 Constants 🦋

  • ABM_HISTOGRAM_TYPE__SW — honestly? the page just says -- undescribed --. That's it. That's the documentation. The upstream authors looked at this one and went "no thoughts, head empty" 🙈 and you know what, we respect the honesty.
  • ABM_HISTOGRAM_TYPE__SW_IF — same situation bestie, -- undescribed --, not a single extra word. iconic in a "mystery box" kind of way. 🎁
not me clocking that both constants are literally undocumented in the source. if you need the real tea on what these do, it's gonna be in the header file itself, not here 😭

👑 SEE ALSO 👑

okay this is where the page pops off — the SEE ALSO list is enormous and we are NOT skipping a single one, because every single one of these is a real reference and we keep all the facts periodt. all of these are in (9), all from the kernel docs, and they all live in the same header house 🏠💖

The kernel file itself: ./drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h — that's the one, that's the mothership.

And the whole friend group:

  • union dmub_addr(9)
  • struct dmub_cursor_offload_pipe_data_dcn30_v1(9)
  • struct dmub_cursor_offload_pipe_data_dcn401_v1(9)
  • struct dmub_cursor_offload_pipe_data_dcn60_v1(9)
  • struct dmub_cursor_offload_pipe_data_v1(9)
  • struct dmub_cursor_offload_payload_data_v1(9)
  • struct dmub_cursor_offload_stream_v1(9)
  • struct dmub_cursor_offload_v1(9)
  • union dmub_fw_meta_feature_bits(9)
  • struct dmub_fw_meta_info(9)
  • union dmub_fw_meta(9)
  • struct dmcub_trace_buf_entry(9)
  • union dmub_fw_boot_status(9)
  • enum dmub_fw_boot_status_bit(9)
  • enum dmub_cursor_offload_comand_type(9)
  • union dmub_fw_boot_options(9)
  • enum dmub_shared_state_feature_id(9)
  • struct dmub_shared_state_ips_fw(9)
  • struct dmub_shared_state_ips_driver(9)
  • struct dmub_shared_state_cursor_offload_v1(9)
  • struct dmub_shared_state_feature_block(9)
  • union dmub_gpint_data_register(9)
  • enum dmub_out_cmd_type(9)
  • struct dmub_cmd_header(9)
  • struct dmub_rb_cmd_common(9)
  • struct dmub_cmd_PLAT_54186_wa(9)
  • struct dmub_rb_cmd_PLAT_54186_wa(9)
  • enum dmub_cmd_mall_type(9)
  • struct dmub_rb_cmd_mall(9)
  • enum dmub_cmd_cab_type(9)
  • struct dmub_rb_cmd_cab_for_ss(9)
  • enum dmub_fams2_allow_delay_check_mode(9)
  • enum dmub_cmd_idle_opt_type(9)
  • struct dmub_rb_cmd_idle_opt_dcn_restore(9)
  • struct dmub_dcn_notify_idle_cntl_data(9)
  • struct dmub_rb_cmd_idle_opt_dcn_notify_idle(9)
  • enum dmub_idle_opt_dc_power_state(9)
  • struct dmub_idle_opt_set_dc_power_state_data(9)
  • struct dmub_rb_cmd_idle_opt_set_dc_power_state(9)
  • struct dmub_clocks(9)
  • enum dmub_cmd_clk_mgr_type(9)
  • struct dmub_rb_cmd_clk_mgr_notify_clocks(9)
  • struct dmub_cmd_digx_encoder_control_data(9)
  • struct dmub_rb_cmd_digx_encoder_control(9)
  • struct dmub_cmd_set_pixel_clock_data(9)
  • struct dmub_cmd_enable_disp_power_gating_data(9)
  • struct dmub_rb_cmd_enable_disp_power_gating(9)
  • struct dmub_dig_transmitter_control_data_v1_7(9)
  • union dmub_cmd_dig1_transmitter_control_data(9)
  • struct dmub_rb_cmd_dig1_transmitter_control(9)
  • struct dmub_rb_cmd_domain_control_data(9)
  • struct dmub_rb_cmd_domain_control(9)
  • struct dmub_rb_cmd_dpphy_init(9)
  • enum dp_aux_request_action(9)
  • enum aux_return_code_type(9)
  • enum aux_channel_type(9)
  • struct aux_transaction_parameters(9)
  • struct dmub_rb_cmd_hpd_sense_notify(9)
  • enum dmub_phy_fsm_state(9)
  • enum dmub_abm_ace_curve_type(9)
  • enum dmub_cmd_panel_cntl_type(9)
  • struct dmub_cmd_panel_cntl_data(9)
  • struct dmub_rb_cmd_panel_cntl(9)
  • struct dmub_cmd_cable_id_input(9)
  • struct dmub_cmd_cursor_offload_init_data(9)
  • struct dmub_rb_cmd_cursor_offload_init(9)
  • struct dmub_cmd_cursor_offload_stream_data(9)
  • struct dmub_rb_cmd_cursor_offload_stream_cntl(9)
  • union dmub_rb_cmd(9)
  • union dmub_rb_out_cmd(9)
  • struct dmub_rb_init_params(9)
  • struct dmub_rb(9)

like, seventy entries. she said "I have friends in every subsystem" and honestly? queen behavior. 👑🌈

also yes, enum dmub_cursor_offload_comand_type(9) is spelled comand in the original and we are keeping it exactly as-is because changing it would break the reference. typos are load-bearing bestie 💀

that's the whole page! short and sweet, two undocumented constants, and a SEE ALSO section longer than my screen time report. 🍓

kisses, the kernel docs ✨ source/version vibes: ./drivers/gpu/drm/amd/display/... dated October 2026, filed under enum dmub_ab...stogram_type(9) — go read it again anytime, ily, bye! 💜🧚

📦 where this page comes from