MESA_LOADER_DRIVER_OVERRIDE= should be set to either i965 or iris Note that you can only choose if you have Broadwell (gen8 graphics) or newer, Intel chips up to and including Haswell can only use the i965 OpenGL driver. You can set MESA_LOADER_DRIVER_OVERRIDE or use a $HOME/.drirc file to override the default. iris has been the default for 8th generation, and newer, Intel graphics chips since Mesa 20.0.You can't choose it with Linux 4.x and Mesa will default to i965 (assuming Mesa even supports iris if the distribution is shipping a kernel that old). iris has been available since Mesa 19.2.0.What choice you make does not affect Vulkan, Vulkan support on Intel graphics chips is is handled by a completely different driver called ANV. You can manually override what Mesa graphics driver is used for OpenGL on Intel (i)GPUs. That is not a huge difference is this test done ages ago when Mesa 19.2.2 was new but it is a barely more than margin of error win for Iris.īasemark GPU 1.2.1 special "Media" edition iris scores slightly lower in Basemark GPU 1.2.1 and marginally higher in UNIGINE Superposition. There does not appear to be any huge difference in either performance or stability between iris and i965.
The i915 Linux kernel driver is the right driver (and only driver) regardless of what user-space OpenGL driver is used. The good old i965 driver remains optionally available on machines with gen8+ Intel graphics and it remains the default on machines with gen <=7.5 graphics. Iris got on-disk shader cache support in May 2019. All Intel graphics chips running on Linux used it for OpenGL until Iris, a new and shiny OpenGL driver for Intel graphics chips, replaced it as default for gen8+ (i)GPUs starting with Mesa 20. Intel i965 is a older Mesa OpenGL graphics driver. Intel hinted that there will be dedicated GPUs based on their 12th generation Iris X e architecture time and time again throughout 2020. There's typically a X e as in Iris X e in that context.
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