Passer au contenu principal
  • Passer des commandes rapidement et facilement
  • Afficher les commandes et suivre l’état de votre expédition
  • Créez et accédez à une liste de vos produits

External Monitor Is Not Detected until the Display Output Mode Is Manually Selected Using a USB Type-C Dongle

Résumé: The following article provides information about a problem with an external display. The monitor may not be detected, under certain graphics configurations.

Cet article concerne Cet article ne concerne pas Cet article n’est associé à aucun produit spécifique. Toutes les versions du produit ne sont pas identifiées dans cet article.

Symptômes

You may experience the following symptom when connecting to an external display:

  • The computer may not automatically detect the external monitor.

If you own an Alienware x15 R1, or Alienware x17 R1 laptop, and have set this configuration:

  • The laptop screen supports the Nvidia Dynamic Display Switch (DDS) feature.
  • You have entered the BIOS and enabled the Discrete Graphics Processing Unit (dGPU) mode.
  • The external Monitor is connected using the Thunderbolt port on the computer.

Cause

Enabling dGPU mode puts the integrated Intel graphics into power-saving mode. When the BIOS is set to use the discrete Nvidia graphics, monitor auto detection is disabled.

Résolution

Note: The Intel Graphics are working as designed. Intel confirms this is a known hardware limitation when you hard set dedicated graphics only.
 

If you are looking to resolve this:

  • You may be able to enable detection, by pressing either Win + P, or Fn + F8 to select a video output display mode manually.
  • You can disable the dGPU mode in the computers BIOS. Check you User Manual of your computer to navigate the BIOS and change the dGPU mode.
  • You can use a different cable and another port such as HDMI or DisplayPort on the computer that supports external graphics.

Informations supplémentaires

Recommended Articles

Here are some recommended articles related to this topic that might be of interest to you.

Produits concernés

Alienware x15 R1, Alienware x17 R1
Propriétés de l’article
Numéro d’article: 000188299
Type d’article: Solution
Dernière modification: 08 Aug 2024
Version:  4
Trouvez des réponses à vos questions auprès d’autres utilisateurs Dell
Services de support
Vérifiez si votre appareil est couvert par les services de support.