Also additional note. According to the Dell thread, it seems that this issue is easier to reproduce with higher bandwidth required. E.g. there was a report that this issue could be reproduced with 1080p + 120 Hz when it works fine with 1080p + 60 Hz.
Also additional note. According to the Dell thread, it seems that this issue is easier to reproduce with higher bandwidth required. E.g. there was a report that this issue could be reproduced with 1080p + 120 Hz when it works fine with 1080p + 60 Hz.