fb_get_hfreq(9)

💖 fb_get_hfreq(9) 💖

okay bestie, welcome to the Kernel API Manual ✨ this page is all about fb_get_hfreq(9), and it is literally here to estimate hsync. no cap 🫶

✨ NAME ✨

fb_get_hfreq — estimate hsync 💅

✨ SYNOPSIS ✨

u32 fb_get_hfreq (u32 vfreq , u32 yres );

✨ ARGUMENTS ✨

• vfreq — vertical refresh rate ⭐
• yres — vertical resolution 🦋

✨ DESCRIPTION ✨

so the description is giving formula realness, and we are not editing it, bestie — here it is exactly as written:

       (yres + front_port) * vfreq * 1000000 hfreq =
       ------------------------------------- (1000000 - (vfreq * FLYBACK)

that's the whole description vibe 🎀 front_port and FLYBACK are just chillin' in there, iykyk.

✨ SEE ALSO ✨

• Kernel file ./drivers/video/fbdev/core/fbmon.c 📁
• fb_create_modedb(9) 👑
• fb_destroy_modedb(9) 💅
• fb_get_vblank(9) 🌈
• fb_get_hblank_by_hfreq(9) 🔥
• fb_get_hblank_by_dclk(9) ⭐
• of_get_fb_videomode(9) 🦋

that's the whole vibe, bestie 💜 this page is from ./drivers/video/fbdev/core, dated October 2026, and yes it's still fb_get_hfreq(9) — periodt. stay slay 🌸