ENUM FE_ROLLOFF(9)

💅 enum fe_rolloff(9)

okay so bestie, welcome to the Kernel API Manual, page enum fe_rolloff(9) 🎀 — this is the lil enum that tells your DVB frontend what rolloff factor to use. yes it's niche. yes it's iconic. buckle up 🦋

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✨ NAME ✨

enum fe_rolloff — Rolloff factor 🌸

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✨ SYNOPSIS ✨

enum fe_rolloff {
    ROLLOFF_35 ,
    ROLLOFF_20 ,
    ROLLOFF_25 ,
    ROLLOFF_AUTO ,
    ROLLOFF_15 ,
    ROLLOFF_10 ,
    ROLLOFF_5

};

like, that's the whole squad, in that exact order, no cap 👑

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✨ Constants ✨

• ROLLOFF_35 — Roloff factor: α=35% 💖
• ROLLOFF_20 — Roloff factor: α=20% ✨
• ROLLOFF_25 — Roloff factor: α=25% 🎀
• ROLLOFF_AUTO — Auto-detect the roloff factor. let the hardware figure it out, main character energy fr 🔥
• ROLLOFF_15 — Rolloff factor: α=15% 🦋
• ROLLOFF_10 — Rolloff factor: α=10% 🌸
• ROLLOFF_5 — Rolloff factor: α=5% ⭐

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💜 Description 💜

note: Roloff factor of 35% is implied on DVB-S. On DVB-S2, it is default. 💅

like, that's literally the whole vibe — DVB-S lowkey assumes 35% whether you asked or not, and on DVB-S2 it's the default default. periodt 🙈

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🌈 SEE ALSO 🌈

Kernel file ./include/uapi/linux/dvb/frontend.h — and bestie, the whole friend group shows up here:

enum fe_caps(9), struct dvb_frontend_info(9), struct dvb_diseqc_master_cmd(9), struct dvb_diseqc_slave_reply(9), enum fe_sec_voltage(9), enum fe_sec_tone_mode(9), enum fe_sec_mini_cmd(9), enum fe_status(9), enum fe_spectral_inversion(9), enum fe_code_rate(9), enum fe_modulation(9), enum fe_transmit_mode(9), enum fe_guard_interval(9), enum fe_hierarchy(9), enum fe_interleaving(9), enum fe_pilot(9), enum fe_delivery_system(9), enum atscmh_sccc_block_mode(9), enum atscmh_sccc_code_mode(9), enum atscmh_rs_frame_ensemble(9), enum atscmh_rs_frame_mode(9), enum atscmh_rs_code_mode(9), enum fecap_scale_params(9), struct dtv_stats(9), struct dtv_fe_stats(9), struct dtv_property(9), struct dtv_properties(9)

go read them all, i'll wait 🫶

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and that's the page!! 🧚 source: ./include/uapi/linux/dvb, dated October 2026, sittin' pretty in the Kernel API Manual — mwah, slay, bye bestie 💖✨