pm2fb_setcolreg(9)

✨ NAME ✨

okay so this is the Kernel API Manual page for pm2fb_setcolreg(9), and it's literally here to say: pm2fb_setcolreg — sets a color register. that's the name, periodt. 🎀

🌸 SYNOPSIS 🌸

bestie, here's the exact signature, spacing and all:

int pm2fb_setcolreg (unsigned regno , unsigned red , unsigned green ,
       unsigned blue , unsigned transp , struct fb_info *info );

🎀 ARGUMENTS 🎀

• regno — boolean; 0 is copy local, 1 is get_user function.
• red — the page calls this a frame buffer colormap structure (yep, that's the description, keeping it 100).
• green — the green value, which can be up to 16 bits wide.
• blue — the blue value, which can be up to 16 bits wide.
• transp — if supported, the alpha value, which can be up to 16 bits wide.
• info — frame buffer info structure.

🦋 DESCRIPTION 🦋

so this function sets a single color register. the values supplied have a 16 bit magnitude, and that magnitude needs to be scaled in this function for the hardware — that's the whole gig, no cap. the page also says it's pretty much a direct lift from tdfxfb.c (iconic, honestly). 🫶

returns a negative errno on error, or 0 on success. slay. ✨

🌈 SEE ALSO 🌈

• Kernel file ./drivers/video/fbdev/pm2fb.c
• pm2fb_set_par(9)
• pm2fb_pan_display(9)
• pm2fb_blank(9)
• pm2fb_probe(9)
• pm2fb_remove(9)

like, go read the kernel file and the sibling functions if you want the full lore 💖👑

okay bye bestie, this page's source/version is ./drivers/video/fbdev and the date is October 2026 — mwah 💋✨