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[ubuntu netbook remix] Confusion on video driver being used

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http://ubuntuforums.org – I'm running Precise 12.04 on an Acer AspireOne 751h netbook (i.e. with Atom and GMA500 adapter). According to 'System Setting-Details-Graphics' it seems that Gallium 0.4 on llvmpipe as video driver. (I did not install Gallium deliberately. I suspect it happened upon installing mesa-utils in order to solve the problem of the "Unknown Driver" message in 'System Setting-Details-Graphics' as suggested here. However, if I do 'lsmod' I'm getting "psb_gfx" for the video. As indicated in other posts (e.g. here) Atom processor can hardly cope with the processing implied by Gall (Hardware)