dm_test_ism_...e_full_power(9)

💅 dm_test_ism_force_full_power — a Kernel API Manual moment

okay so bestie, we're in the Kernel API Manual today (yes the whole manual, we're fancy) and the star of the show is dm_test_ism_force_full_power(9). buckle up 🎀

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✨ NAME ✨

dm_test_ism_force_full_power — ngl the name literally tells the whole story: it forces full power, and what that actually does is send EXIT_IDLE to every single CRTC. every one. no crumbs. 👑

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🦋 SYNOPSIS 🦋

void dm_test_ism_force_full_power (struct kunit *test );

that's it, that's the whole signature, she's lowkey minimal 💅

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🌸 ARGUMENTS 🌸

• test — the KUnit test context, aka the little main-character passport this test carries around 🫶

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💖 DESCRIPTION 💖

so here's the vibe: we start out in the initial FULL_POWER_RUNNING state, right? and from there, EXIT_IDLE_REQUESTED is literally a no-op. like it shows up to the party and nothing happens 🙈

so the FSM just... stays in FULL_POWER_RUNNING. no glow-up, no transition, no nothing.

and because nothing moved, no DC work is scheduled. periodt. that's the entire behaviour being tested here — the test confirms the no-op is a no-op, which is honestly iconic in its own quiet way ✨

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🔥 SEE ALSO 🔥

the kernel file in question, for when you want to read the source instead of vibing with me:

./drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_ism_test.c

and here's the whole friend group, all of them (9), all of them invited 🎀

• dm_test_ism_idle_delay_entry_count_exceeds_history_size(9)
• dm_test_ism_init_sets_initial_state(9)
• dm_test_ism_fini_after_init(9)
• dm_test_ism_set_last_idle_ts_updates_timestamp(9)
• dm_test_ism_insert_record_basic(9)
• dm_test_ism_insert_record_wraps_around(9)
• dm_test_ism_trigger_event_valid_transition(9)
• dm_test_ism_trigger_event_invalid_transition(9)
• dm_test_dispatch_next_event_hyst_wait_no_delay(9)
• dm_test_dispatch_next_event_hyst_wait_with_delay(9)
• dm_test_dispatch_next_event_opt_idle_no_sso_delay(9)
• dm_test_dispatch_next_event_opt_idle_with_sso_delay(9)
• dm_test_dispatch_next_event_timer_aborted(9)
• dm_test_dispatch_next_event_no_action_state(9)
• dm_test_ism_commit_event_no_state(9)
• dm_test_ism_commit_event_cursor_transition(9)
• dm_test_ism_commit_event_invalid_event(9)
• dm_test_ism_disable_enable_cycle(9)
• dm_test_ism_dispatch_hysteresis_schedule_and_cancel(9)
• dm_test_ism_dispatch_optimized_idle_defers_sso(9)

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✿ and that's the page bestie ✿ this little gem comes from ./drivers/gpu/drm/amd/display/... and it's dated October 2026 — write it in your notes, keep it in your heart, and go touch some grass (after you finish the test suite) 🧚💜