drm_fb_help...ode_unlocked(9)

💅 drm_fb_helper_restore_fbdev_mode_unlocked — NAME ✨

okay so bestie, this page is from the Kernel API Manual (yes the big serious kernel one, but we're gonna make it cute) and it's all about drm_fb_helper_restore_fbdev_mode_unlocked — literally the function whose whole job is restore fbdev configuration. that's it. that's the name. 🎀

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🌸 SYNOPSIS 🌸

like, here's the whole signature, copy it exactly bestie, no cap:

int drm_fb_helper_restore_fbdev_mode_unlocked (struct drm_fb_helper
*fb_helper , bool force );

two arguments, one int coming back at you. slay. ✨

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🦋 ARGUMENTS 🦋

• fb_helper — the driver-allocated fbdev helper. and yes, plot twist: it can be NULL. the main character is allowed to not show up. 💀
• force — ignore present DRM master. like, just pretend they're not there and do the thing anyway. 🙈

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💖 DESCRIPTION 💖

so this helper is supposed to be called from fbdev emulation's drm_client_funcs.restore callback. that's its whole venue, its little stage. 🎭

and what does it do? it makes sure the user isn't greeted with a black screen when the userspace compositor releases the display device. the way that would be so jarring 😭 imagine your compositor dips and the screen just goes void mode — no. not on this function's watch. it restores the fbdev configuration so everyone's vibes (and pixels) stay intact. 👑

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⭐ RETURN ⭐

• 0 on success 🎉
• or a negative errno code otherwise 😔

that's the whole deal. binary-ish. either iconic or an error code. periodt.

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🌈 SEE ALSO 🌈

the whole friend group, fr fr — kernel file ./drivers/gpu/drm/drm_fb_helper.c plus every sibling function:

• fbdev helpers(9)
• drm_fb_helper_blank(9)
• drm_fb_helper_prepare(9)
• drm_fb_helper_unprepare(9)
• drm_fb_helper_init(9)
• drm_fb_helper_unregister_info(9)
• drm_fb_helper_fini(9)
• drm_fb_helper_deferred_io(9)
• drm_fb_helper_set_suspend(9)
• drm_fb_helper_set_suspend_unlocked(9)
• drm_fb_helper_setcmap(9)
• drm_fb_helper_ioctl(9)
• drm_fb_helper_check_var(9)
• drm_fb_helper_set_par(9)
• drm_fb_helper_pan_display(9)
• drm_fb_helper_fill_info(9)
• drm_fb_helper_initial_config(9)
• drm_fb_helper_hotplug_event(9)
• drm_fb_helper_gem_is_fb(9)

go read them. iykyk. 🫶

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quick vibe check: these references are exactly what the page says, bestie — don't come for me if you wanted more, i'm not out here inventing lore. 💅

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and that's the page!! 🍓 this one lives under ./drivers/gpu/drm, dated October 2026, from the Kernel API Manual — mwah, bye bestie, go restore some fbdev configuration 💜✨🧚