Comment 28 for bug 180742

Jordan, you'd need AMD driver 2.7.7.6 to raise the minimal color depth to 16-bit default. This should fix your resolution issue. However, if it doesn't, you'd have to investigate whether your Koolu client runs on a General software BIOS. If it does, it could very well be that the BIOS was compiled with TFT support enabled, which drastically reduces the number of available resolutions. It could also be that the BIOS was compiled without DDC support, which is a frequent side-effect of building a BIOS with RS232 support. In that case, I would suggest contacting Koolu for instructions on how to update your BIOS with a correct build.