Manuel Teira, have you tried making a virtual desktop where the screens are one above other? Then you need only "Virtual 1280 1792". I tried it like that, but glxinfo tells me "direct rendering: No (If you want to find out why, try setting LIBGL_DEBUG=verbose)". How do you make such a setting? Which log told you "Cannot support DRI with frame buffer width > 2048"?
Manuel Teira, have you tried making a virtual desktop where the screens are one above other? Then you need only "Virtual 1280 1792". I tried it like that, but glxinfo tells me "direct rendering: No (If you want to find out why, try setting LIBGL_DEBUG= verbose) ". How do you make such a setting? Which log told you "Cannot support DRI with frame buffer width > 2048"?