DOS ain't dead

4k resolution under DOS :) (Users)

posted by RayeR , CZ, 20.01.2024, 03:59
(edited by RayeR on 20.01.2024, 04:26)

Yes, DP I mean when LCD was connected via Display port interface.
Currently I don't have access to HDD that I run my experiments, if I remember well there was not any modes between 1600x1200 and 3840x2160, so any other modes was not wide bur classic 4:3. I will post full log later.

I guess that it works this way: after power on the GPU BIOS/firmware checks through available video outputs if some monitor is attached and read EDID from it. It will then know, what is the native resolution. It has some fixed VESA mode table. BIOS is copied from flashROM to RAM so it can change the VESA mode table in RAM and use some free slot at the end to include the native LCD resolution (it's values are probably calculated dynamically). But I don't know why it behaves differently on DP and HDMI. In the past I has similar issues with GeForce 7600 a 7900 where it offered my LCD native 1600x1200 mode only when attached via analog VGA but not via DVI-D - then it show only 1280x1024. I had to hack VESA mode table that I found in BIOS image so then got 1600x1200 on DVI too. On later nvidia GPU 6xx and 9xx it's fixed and I have 1600x1200 with stock BIOS...

---
DOS gives me freedom to unlimited HW access.

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