My name is Vesa and I'm indie game developer from Finland.
Looking for something 25"+ that has touch and VESA mount.
ASUS has one but you need their adaptor to give you the VESA mount and no one seems to sell it.
MIS seems to be the only one but are a little flashy and we don't nee the extra $600 of gaming hardware.
The Dell XPS 27 would be the one but no VESA mount.
I've had this problem myself with the vesa driver, albeit using the integrated Intel chipset. Even when adding the xorg=vesa or xforcevesa commands to the syslinux bootloader I get the same error as you.