I am using a Lenovo G510 with an Intel integrated card and a Radeon R7 M265 discrete card. Ubuntu version is 14.04 trusty while the kernel is 3.13.0-46-generic. I've spent quite a few hours trying to make Radeon to work and at this point I am close to giving up. I tried to use the proprietary fgrlx drivers but I wouldn't be able to boot, if I don't boot and I try to run amdconfig it says that no supported adapter was found and I even tried to use vgaswitcheroo without success. I just don't know what's wrong at this point and I would really like to solve this issue so that I can do some OpenGL work without resorting to switching to Windows. Any help is much appreciated!
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Veritas
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Using mesa this should work, but i do recommend to upgrade to the latest ubuntu release or use the updated oibaf drivers PPA and probably also update the kernel using the latest from here, but both mesa and the kernel have improved a lot in the last few years for the 3D support and fixed many problems
Finally check this for the direct usage of each GPU
higuita
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