Based on the PCI DeviceID (0x0f31), this appears to be a "Valleyview (Baytail)" device (as described in "intel_module.c" in the xf86-video-intel sources.
This is considered a generation 7.1 device and as such currently defaults to SNA rather than UXA (gen 3.1-5.0 inclusive). I suppose we need more data from Atom users to see if this is a common enough situation to warrant an additional device default to UXA. As this is a USB-stick installation, I presume you expect to be able to boot it on any machine you encounter? Other systems with intel graphics devices may be just fine with SNA, so you may want to move the "xorg.conf" aside on those systems. Of course, you won't know for sure until you try it each way. -- |/"\ John D. Baker, KN5UKS NetBSD Darwin/MacOS X |\ / jdbaker[snail]consolidated[flyspeck]net OpenBSD FreeBSD | X No HTML/proprietary data in email. BSD just sits there and works! |/ \ GPGkeyID: D703 4A7E 479F 63F8 D3F4 BD99 9572 8F23 E4AD 1645