Comment 9 for bug 1459613

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Daniel van Vugt (vanvugt) wrote : Re: connecting 2x 4k screens on a Dell XPS12 (9Q33): compiz crashed with SIGSEGV in GLTexture::matrix()

If your desktop is larger than GL_MAX_TEXTURE_SIZE (sounds unlikely) then you need to have the "Copy to texture" plugin enabled in Compiz to work around that (if I recall correctly). Although your max texture size is likely quite large enough and that plugin was enabled by default in Unity7 last I checked...