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/usr/share/gnome-session/hardware-compatibility is in gnome-session-bin 3.18.1.2-1ubuntu1.

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##
## This file contains a list of blacklist/whitelist regular expressions for
## renderer strings.
##
## The regular expressions are case-insensitive POSIX Extended Regular
## Expressions. See regex(7) for details.
##
## Syntax:
##  - Comment lines start with '#'
##  - Lines starting with '+' are whitelisting.
##  - Lines starting with '-' are blacklisting.
##  - Lines not starting with '#', '+', '-' are ignored.
##

# Intel 830-865
-Intel\(R\) 8[[:digit:]]{2,2}[^[:digit:]]

# Intel IGD 
-Intel IGD

# Pre-R300 radeon
-Mesa DRI R[12]00[^[:digit:]]
-Mesa DRI R[12]00$

# Old Mesa software GL renderer
-software rasterizer

# Gallium has softpipe; we explicitly enable llvmpipe
-softpipe

# nouveau vieux NV25 doesn't work too well
-Mesa DRI nv25