The "ILO" Gallium3D driver that is an alternative open-source Intel Linux HD Graphics driver built around Gallium3D, continues being refined.
The ILO Gallium3D
driver has principally been the work of LunarG for experimenting with Gallium3D and having a lightweight hardware driver for conducting their tests. The ILO driver currently supports from Sandy Bridge through Haswell generations of Intel HD Graphics hardware. The driver doesn't have the performance nor feature-set of Intel's official classic Mesa DRI driver and is not officially supported by Intel Corp. There's been ILO Gallium3D benchmarks
on a few occasions for those interested and the driver is part of mainline Mesa.
There's been more ILO driver improvements
merged this weekend by Chia-I Wu of LunarG, which includes work for enabling fast depth clears