drm_crtc_vblank_on(9)

🌸 NAME 🌸

drm_crtc_vblank_on — enable vblank events on a CRTC 💫

okay bestie, this is the Kernel API Manual page for drm_crtc_vblank_on(9), and it’s giving “wake the vblank events back up on this CRTC” energy. no cap.

✨ SYNOPSIS ✨

void drm_crtc_vblank_on (struct drm_crtc *crtc );

🎀 ARGUMENTS 🎀

• crtc — the CRTC in question, obviously 💅

💖 DESCRIPTION 💖

This function restores the vblank interrupt state that was captured with drm_crtc_vblank_off again, and it’s generally called when enabling the crtc. slay ✨

🚨 important vibe check: calls to drm_crtc_vblank_on and drm_crtc_vblank_off can be unbalanced, and so they can also be unconditionally called in driver load code to reflect the current hardware state of the crtc. do not skip this part, fr fr 😭

Also note: unlike in drm_crtc_vblank_on_config, default values are used. that’s the tea ☕💅

🦋 SEE ALSO 🦋

• Kernel file ./drivers/gpu/drm/drm_vblank.c vblank handling(9)
• drm_crtc_accurate_vblank_count(9)
• drm_vblank_init(9)
• drm_dev_has_vblank(9)
• drm_crtc_vblank_waitqueue(9)
• drm_calc_timestamping_constants(9)
• drm_crtc_vblank_helper_get_vblank_timestamp_internal(9)
• drm_crtc_vblank_helper_get_vblank_timestamp(9)
• drm_crtc_get_last_vbltimestamp(9)
• drm_crtc_vblank_count(9)
• drm_vblank_count_and_time(9)
• drm_crtc_vblank_count_and_time(9)
• drm_crtc_next_vblank_start(9)
• drm_crtc_arm_vblank_event(9)
• drm_crtc_send_vblank_event(9)
• drm_crtc_vblank_get(9)
• drm_crtc_vblank_put(9)
• drm_crtc_wait_one_vblank(9)
• drm_crtc_vblank_off(9)
• drm_crtc_vblank_reset(9)
• drm_crtc_set_max_vblank_count(9)
• drm_crtc_vblank_on_config(9)
• drm_crtc_vblank_restore(9)
• drm_handle_vblank(9)
• drm_crtc_handle_vblank(9)
• drm_crtc_vblank_start_timer(9)
• drm_crtc_vblank_cancel_timer(9)
• drm_crtc_vblank_get_vblank_timeout(9)

that’s the whole entire mood, bestie: source/version ./drivers/gpu/drm, dated October 2026, for drm_crtc_vblank_on(9). mwah 💅✨