I uninstalled drivers with DDU and reinstalled the AMD driver. It is now correctly identified as Firepro W6150M. It is dated older than the Radeon driver but that is always the case with firepro drivers and it is ok. I guess Firepro W6150M and Radeon R9 M385 are based on the same GPU. BTW this also happened with the zbook 14 G2. (likely other zbooks with firepro too) Somehow when installing AMD sourced firepro driver, windows loads radeon driver from windows update since it is dated newer and gpus are physically similar. Thanks.