video drivers installed, but no WebGL or OpenGL acceleration working

I have a XPS 13 Developer Edition with Ubuntu 14.04, but nothing requiring 3d acceleration is working.

lspci | grep VGA gives me:

00:02.0 VGA compatible controller: Intel Corporation Broadwell-U Integrated Graphics (rev 09)

and lshw -c video outputs

  *-display               
   description: VGA compatible controller
   product: Broadwell-U Integrated Graphics
   vendor: Intel Corporation
   physical id: 2
   bus info: pci@0000:00:02.0
   version: 09
   width: 64 bits
   clock: 33MHz
   capabilities: msi pm vga_controller bus_master cap_list rom
   configuration: driver=i915 latency=0
   resources: irq:63 memory:f6000000-f6ffffff memory:e0000000-efffffff ioport:f000(size=64)

modinfo i915 gives me this

filename: /lib/modules/3.13.0-51-generic/kernel/drivers/gpu/drm/i915/i915.ko license: GPL and additional rights description: Intel Graphics author: Tungsten Graphics, Inc. license: GPL and additional rights srcversion: EAE574025ED8FCDDFFC9401 ... deleted for brevity ... depends: drm_kms_helper,drm,video,i2c-algo-bit intree: Y vermagic: 3.13.0-51-generic SMP mod_unload modversions

I enabled WebGL in Chrome as posted in another question and I get a false positive that everything is working in chrome://gpu

Graphics Feature Status

Canvas: Hardware accelerated

Flash: Hardware accelerated

Flash Stage3D: Hardware accelerated

Flash Stage3D Baseline profile: Hardware accelerated

Compositing: Hardware accelerated

Multiple Raster Threads: Enabled

Rasterization: Hardware accelerated

Threaded Rasterization: Enabled

Video Decode: Hardware accelerated

Video Encode: Hardware accelerated

WebGL: Hardware accelerated

Just to be clear, if I go to any site requiring WebGL, the detector fails and I'm shown whatever non-webgl content older browsers get.