First post, by Baoran
My soyo sy-5ema+ motherboard seems to have some kind of issue with usb keyboards. I have usb keyboard support enabled in bios. In text based programs like nssi, topbench or sysinfo for example the screen suddenly gets corrupted either it gets horizontal black lines or it flattens everything and shows it corrputed at upper part of screen and only way to fix it is to return to dos and do MODE 80 to reset the text mode and that returns everything to normal. Another thing I noticed was that whenever a key is pressed on a usb keyboard the system slows down. For example in NSSI benchmark screen for example when key is pressed and if you hold any key down score goes down and it drops from 78000 dhrystones to 48000 dhrystones.
I tried 3 different video cards and 2 different usb keyboards and nothing fixed the corruption. Only thing that fixes these things is to disable usb keyboard support in bios and connect older ps2 keyboard. Any idea what could be causing this kind of thing with usb keyboards?