DOS ain't dead

4k resolution under DOS :) (Users)

posted by Zyzzle, 19.01.2024, 01:51

> Hi, I had a chance to play little bit with 4k LCD connected to my GTX 970.
> Primary goal is to hack/unlock 4k mode @60Hz under WinXP but I was also
> curious if there's any chance to get it under DOS too. And it is possible.
> But it depends on what kind of connection I use. If LCD is attached via
> HDMI I got max VESA mode 1280x1024/32bpp however via DP 1.2 I got
> 3840x2160/8 and 16 (not 32)bpp @60Hz, when switched LCD to DP 1.1 I got the
> same @30Hz. It's known than nvidia BIOS builds VESA mode list dynamically
> according to EDID of attached monitor. I don't know if EDID is different
> for DP and HDMI. I run VESA test on it got decent ~180FPS :)
Very impressive. Your report is the very first I've heard of anyone getting a VESA mode of 3840x2160 under DOS. What does that VESA mode report as using your utility? Are there other modes such as 1920x1440 or 2048x1536 generated as well? My guess is you only get 1920x1080 and 3840x2160 as "additional" modes under DP 1.2. By the way, just what is "DP"? Do you mean "display port" video?

I also fail to understand how VESA modes and / or EDID can be built dynamically. That means the card must not have any cooked in VESA modes in its vBIOS? Where in RAM is the VESA table put? May this "dynamic" VESA mode generation be used with other cards, too? (Like my Intel UHD 620 built-in graphics on my laptops)?

If it's possible to generate "dynamic" VESA modes somehow generically, then we've come a long way toward solving the horribly crippled / disabled vBIOSes on "modern" systems.

Complete thread:

• 4k resolution under DOS :) - RayeR, 18.01.2024, 20:25 (Users)
  • 4k resolution under DOS :) - Zyzzle, 19.01.2024, 01:51
    • 4k resolution under DOS :) - RayeR, 20.01.2024, 03:59