I can verify this.
The OS , in my case windows7 Pro runs fine with USB support, so keyboard etc are working but as soon hen the computer is rebboted to install a second OS then the DX58SO refuses to detect the USB keyboard. And, I'm not a standard computer user so do know a bit of computer and this is the first board that I ever passed my hand that has keyboard problems at boot stage.
So it's not only during syslinux/grub session, the keyboard does not get ANY POWER.
Well short glitches. If you look at the num lock led, it flashes less then a second twice but then stays off, untill the OS that has been installed (and working) enables the keyboard again.
I send this computer back to the dealer, then swapped the board but now back the same problem.
This board has problem with USB...so Intel... why is this board switching of power to the USB keyboard?
Correction: the USB keyvoard does get power , enough for the F2, F10, F7 function keys so the keyboard controller is working at some level.
t stops however as soon when the status pases 94 and USB support starts again as soon when any OS has started.
So the mainboard is not defect at all.
BUG description : USB disable at boot stage.
BIOS version : 4405 and previous version.
Solution: BIOS version 3044 (dated 2008)
A more recent BIOS could work also but the last two version sure contains the bug.
If You install version 3044 then keyboard will work at boot stage.
I just installed ubuntu 64 without tweaking the ubuntu setup.
Notes: if you encounter other problems related to other hardware, then update the BIOS version by version untill the problem is solved.
@Intel: fix bug
UEFI support is default disabled in the BIOS.
You may only enable UEFI boot if you are sure that the OS supports UEFI boot at install stage.
UEFI has no impact on USB problems, an USB keyboard refuses to work at boot stage as mentioned by the topic starter and I had the same problem.
Switching to the older BIOS version solved lthe USB problem at boot stage, with or without UEFI used.
UEFI is a way to speed up the boot time and uses an additional hidden partition.
Not true-- the UEFI Boot setting DOES make a difference -- THE difference (at least with BIOS 5020). If it's enabled, the USB Keyboard is totally non-functional. With it Disabled, the keyboard works fine in GRUB (and DOS, etc.) as long as USB legacy emulation is enabled. This hugely sucks because UEFI cannot be used with this system now (I cannot boot the UEFI shell or do anything that requires any interactivity that depends on the UEFI firmware to deliver keyboard services). This needs to be fixed.
I did say some posts ago and also on other threads that I switched back to an older BIOS.
UEFI/EFI works fine there with USB support at boot stage. I installed windows 7 with UEFI support and USB keyboard and mouse are working fine, meaning , also on boot stage.
Thing is: USB connected keyboards/mouse have nothing to do with the UEFI/EFI boot.
But Intel have some problem in their firmware at that stage.
Sure Intel should fix this bug in their firmware.
Technically, you're right -- USB has nothing to do with UEFI Boot. The problem is that they apparently left out the USB drivers when UEFI Boot mode is enabled (and yes, they will fix it). I can also confirm that running BIOS version 4934 (with support for Westmere) allows UEFI boot to work as well as boot from USB flash and USB keyboard.