> 1. Prince of Persia SoT run with WINEDEBUG=+warn and minimum graphics > settings gives > [---] > fixme:d3d9:Direct3DShaderValidatorCreate9 stub > fixme:d3d_shader:print_glsl_info_log Error received from GLSL shader > #31: > "Fragment shader was successfully compiled to run on > hardware.\nWARNING: > 0:2: extension 'GL_ARB_draw_buffers' is not supporte" Those are harmless. I think fglrx violates the spec here because it isn't supposed to write anything on successful compilation(Instead it tells me verbally that the compile was successful). GL_ARB_draw_buffers is actually supported, but the driver nevertheless complains. I never saw any negative effect, and the extension indeed works. > Can I help in some way? Trying patches, running other tests or games > (e.g., Bioshock as a shader 3.0 game)? Is there some git branch worth > trying out? No patches to test unfortunately. Unless you want to dig into the code and start debugging the driver's behavior etc there is nothing you can do unfortunately