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After I installed mesa-utils in order to get rid of the "Unknown Driver" message (see here) I got contradicting info about which driver is actually being used.

"System Settings" says: Gallium 0.4 on llvmpipe (LLVM 0x300), but if I type lsmod | grep video I find psb_gfx in the "video" row. Any idea?

Especially, if Gallium is really being used, how to remove it and fall back to psb_gfx? I'm using an AspireOne 751h with Atom, so processing power is pretty scarce and I'd prefer not to waste it to run a SW emulation of a GPU.

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