Why radeon video driver fails to boot GUI in Red Hat Enterprise Linux 7.4 ?

Solution Verified - Updated -

Issue

  • After upgrading RHEL7.3 to RHEL7.4 cannot use GUI
  • Issue is only seen with kernel-3.10.0-693.1.1.el7
  • Following error messages are observed under /var/log/messages
[  796.237589] [drm:radeon_atom_pick_dig_encoder [radeon]] *ERROR* chosen encoder in use 1
kernel: [drm:radeon_atom_pick_dig_encoder [radeon]] *ERROR* chosen encoder in use 1
kernel: [  857.862387] [drm:radeon_atom_pick_dig_encoder [radeon]] *ERROR* chosen encoder in use 0

Environment

  • Red Hat Enterprise Linux 7.4
  • Video card RV710 [Radeon HD 4550]
  • kernel-3.10.0-693.1.1.el7

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