X and Modesetting: Atrophy illustrated. Modesetting is ... Getting - PowerPoint PPT Presentation

Jun 13, 2023 •168 likes •254 views

X and Modesetting: Atrophy illustrated. Modesetting is ... Getting pixels on a screen. Modesetting is ... Boring. Hard. Slow. Requires a lot of hardware to do properly. Tseng ET4000W32p: DAC bus (8bit) R/W Clock Select

X and Modesetting: Atrophy illustrated.
Modesetting is ... Getting pixels on a “screen”.
Modesetting is ... ● Boring. ● Hard. ● Slow. ● Requires a lot of hardware to do properly.
Tseng ET4000W32p: DAC bus (8bit) R/W Clock Select RGB DAC Blank CRTC Pixel Bus (8/16bit) CRT CRT HSync/VSync
Unichrome: CRT DAC CRTC1 TTL Panel Panel External Encoder Scaler CRTC2 External Encoder
External encoder I²C Pixel Bus “Screen” Encoder Blank / Data Enable H/VSync
Enemy: VBE Extension of IBMs VGA BIOS: ● Selfmodifying binary. ● Always loaded at 0xC0000 ● Hooked into interrupt vector table (int10) VBE: ● 1991: v1.2 ● meant to get past VGA limitations, forgood. ● meant to alleviate the burden of modesetting on complex hardware.
Modesetting for 7.1: ● cvt (committed) ● bug #5386: Getting a mode without a Modes directive. ● cvts xf86CVTMode() -> common/xf86cvt.c (attached). ● xf86SetDDCproperties becomes useful (attached). ● adjust drivers to new xf86SetDDCproperties (todo / trivial). ● filter resulting modeslist based on type. (todo / discuss / pending). ● multiple ClockRanges: ● tseng fixup (committed). ● xf86mode.c cleanup (pending). ● non-programmable dotclocks: ● trident fixup (test). ● c&t fixup (redo). ● vga fixup (todo / discuss). ● atimisc fixup (scared). ● xf86mode.c cleanup (pending).

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