i810_dram_off(9)

💖 i810_dram_off(9) — the Kernel API Manual page, but make it make sense 💖

okay bestie, we're in the i810_dram_off(9) page of the Kernel API Manual and ngl this one is short but it's loaded. it's giving "tiny function, huge consequences" energy. let's get into it ✨

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🌸 NAME 🌸

i810_dram_off — turns off/on dram refresh

like, yes, the name says "off" but it also turns it on, okay? the name is lowkey lying to you. main character betrayal fr. 🫶

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✨ SYNOPSIS ✨

void i810_dram_off (u8 __iomem *mmio , u8 mode );

that's it. that's the whole signature. no return value, nothing comes back, it just does the thing. 💅

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🎀 ARGUMENTS 🎀

• mmio — address of register space. like, the actual spot in memory where the registers live. you gotta hand it over, no shortcuts 🦋
• mode — on or off. that's the whole vibe check: are we turning it off, or are we turning it back on? 🙈

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🔥 DESCRIPTION 🔥

Turns off DRAM refresh.

and now the part where you pay attention, bestie, because this is the ⚠️ part:

Must be off for only 2 vsyncs before data becomes corrupt

two vsyncs. that's the budget. that's the whole allowance. go past 2 vsyncs with refresh off and your data literally becomes corrupt — not "oops a bug" corrupt, like the data is ruined corrupt. 😭 so this is a "flip it, do your thing, flip it right back" situation. no lingering. no "one more sec". periodt. 💀

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⭐ SEE ALSO ⭐

the whole friend group shows up here, plus the kernel file it lives in:

• Kernel file ./drivers/video/fbdev/i810/i810_main.c
• i810_screen_off(9)
• i810_protect_regs(9)
• i810_load_pll(9)
• i810_load_vga(9)
• i810_load_vgax(9)
• i810_load_2d(9)
• i810_hires(9)
• i810_load_pitch(9)
• i810_load_color(9)
• i810_load_regs(9)
• get_line_length(9)
• i810_calc_dclk(9)
• i810_enable_cursor(9)
• i810_init_cursor(9)
• i810_round_off(9)
• set_color_bitfields(9)
• i810_check_params(9)
• encode_fix(9)
• decode_var(9)
• i810fb_getcolreg(9)
• i810_init_monspecs(9)
• i810_init_defaults(9)
• i810_init_device(9)

like, go read those too, they're all in their flop era together and honestly they ate 💖

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and that's the page!! this lil baddie lives in ./drivers/video/fbdev/i810 and the docs are dated October 2026 — so yeah, mark your calendar, put it in the group chat, tell your bestie. mwah 💜✨🎀