Comment 24 for bug 1821533

I'm not sure this is a Linux problem. It may be that the panel is reporting bad EDID data. I haven't investigated enough to say for sure. In any case none of the more recent Linux releases fixed the problem in my tests. Also no other open source OSs were able to deal with the onboard LCD panel either. (That may have changed since I tested.)

If you were interested, you might be able to patch the firmware on the onboard panel to provide different EDID information. I looked into doing this and there are some tutorials out there. However, it's possible you could do something wrong and end up worse than you were before. If you learn something new, please post it here. In particular if you find some open source OS that can configure this display properly at full resolution without resorting to forcing EDID information please say so here.