ABMLEVEL (UINT)(9)

🦋 abmlevel (uint) 🦋

Hiii bestie! This is the abmlevel (uint) page from the Kernel API Manual — yes, the manual name is folded in right here at the top like a little name tag 🫶. It's short, it's iconic, and it's literally about overriding the default ABM (Adaptive Backlight Management) level used for DC enabled hardware. No cap.

Requires DMCU to be supported and loaded. That's the vibe check: DMCU has to be supported and loaded, or this whole thing is not giving. 💅

Valid levels are 0-4:

• 0 — ABM should be disabled by default. Zero ABM, zero drama. 😌
• 1-4 — control the maximum allowable brightness reduction via the ABM algorithm, with 1 being the least reduction and 4 being the most reduction. So 1 is the gentle queen 👑 and 4 is full send 🔥.

It defaults to -1, or auto. And here's the tea ☕: userspace can only override this level after boot if it's set to auto. Periodt.

✨ SEE ALSO ✨

Okay so if you're going down this rabbit hole, you're gonna meet the whole extended family. This list has main character energy, fr fr — every single one is invited:

• Kernel file ./drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
• vramlimit (int)(9)
• vis_vramlimit (int)(9)
• gartsize (uint)(9)
• gttsize (int)(9)
• moverate (int)(9)
• audio (int)(9)
• disp_priority (int)(9)
• hw_i2c (int)(9)
• pcie_gen2 (int)(9)
• msi (int)(9)
• svm_default_granularity (uint)(9)
• lockup_timeout (string)(9)
• dpm (int)(9)
• fw_load_type (int)(9)
• aspm (int)(9)
• runpm (int)(9)
• ip_block_mask (uint)(9)
• bapm (int)(9)
• deep_color (int)(9)
• vm_size (int)(9)
• vm_fragment_size (int)(9)
• vm_block_size (int)(9)
• vm_fault_stop (int)(9)
• vm_update_mode (int)(9)
• exp_hw_support (int)(9)
• dc (int)(9)
• sched_jobs (int)(9)
• sched_hw_submission (int)(9)
• ppfeaturemask (hexint)(9)
• forcelongtraining (uint)(9)
• pcie_gen_cap (uint)(9)
• pcie_lane_cap (uint)(9)
• cg_mask (ullong)(9)
• pg_mask (uint)(9)
• sdma_phase_quantum (uint)(9)
• disable_cu (charp)(9)
• virtual_display (charp)(9)
• lbpw (int)(9)
• gpu_recovery (int)(9)
• emu_mode (int)(9)
• ras_enable (int)(9)
• ras_mask (uint)(9)
• timeout_fatal_disable (bool)(9)
• timeout_period (uint)(9)
• si_support (int)(9)
• cik_support (int)(9)
• smu_memory_pool_size (uint)(9)
• async_gfx_ring (int)(9)
• mcbp (int)(9)
• discovery (int)(9)
• mes_log_enable (int)(9)
• uni_mes (int)(9)
• noretry (int)(9)
• force_asic_type (int)(9)
• use_xgmi_p2p (int)(9)
• sched_policy (int)(9)
• hws_max_conc_proc (int)(9)
• cwsr_enable (int)(9)
• max_num_of_queues_per_device (int)(9)
• send_sigterm (int)(9)
• halt_if_hws_hang (int)(9)
• hws_gws_support(bool)(9)
• queue_preemption_timeout_ms (int)(9)
• debug_evictions(bool)(9)
• no_system_mem_limit(bool)(9)
• no_queue_eviction_on_vm_fault (int)(9)
• mtype_local (int)(9)
• pcie_p2p (bool)(9)
• dcfeaturemask (uint)(9)
• dcdebugmask (uint)(9)
• damageclips (int)(9)
• tmz (int)(9)
• freesync_video (uint)(9)
• reset_method (int)(9)
• bad_page_threshold (int) Bad page threshold is specifies the(9)
• vcnfw_log (int)(9)
• sg_display (int)(9)
• umsch_mm (int)(9)
• umsch_mm_fwlog (int)(9)
• smu_pptable_id (int)(9)
• partition_mode (int)(9)
• enforce_isolation (int)(9)
• modeset (int)(9)
• seamless (int)(9)
• debug_mask (uint)(9)
• agp (int)(9)
• wbrf (int)(9)
• rebar (int)(9)
• user_queue (int)(9)
• ptl (int)(9)

Catch you later, bestie — this page came from ./drivers/gpu/drm/amd/amdgpu, it's dated October 2026, and it's the abmlevel (uint)(9) page. Bye! 💖🎀