# External Monitors (HDMI, and DP Alt Mode) not working on Linux

**URL:** <https://community.frame.work/t/external-monitors-hdmi-and-dp-alt-mode-not-working-on-linux/52849>\
**Category:** Linux\
**Tags:** nixos\
**Created:** [June 13, 2024, 1:08pm UTC](https://community.frame.work/t/external-monitors-hdmi-and-dp-alt-mode-not-working-on-linux/52849 "2024-06-13T13:08:00Z")\
**Posts on this page:** 1\
**Showing post:** 16

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**Author:** ![Clement\_Poiret](https://sea1.discourse-cdn.com/flex001/user_avatar/community.frame.work/clement_poiret/32/22929_2.png) [@Clement\_Poiret](https://community.frame.work/u/Clement_Poiret)\
**Post date:** [July 9, 2024, 1:42pm UTC](https://community.frame.work/t/external-monitors-hdmi-and-dp-alt-mode-not-working-on-linux/52849/16 "2024-07-09T13:42:26Z")

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Thanks for your clarification.

As also requested by the support I:

- Booted a live usb of Fedora 40,
- Connected the screen,
- Collected the following logs: [demidecode · GitHub](https://gist.github.com/clementpoiret/ed7263d1dcbbfebc962bb36d745ec55d)

I am on the latest bios version, I tried the screen on all possible slots, with and without a usb-c expansion card, with the laptop being plugged or not.

I used no thirdparty cable nor hub, I used only the stock usb-c cable, the one with which the screen is working on other laptops.

For the sake of reference, this looks like the same issue as: [DisplayPort over USB-C not working (AMD 13)](http://community.frame.work/t/displayport-over-usb-c-not-working-amd-13/41583)

May it be related to [AMD Framework USB-C charger compatibility issues](http://community.frame.work/t/amd-framework-usb-c-charger-compatibility-issues/39323) ?

As mentioned in the first linked thread, I just ordered a USB 4, thunderbolt compatible cable, which solved the issue for at least one user.

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_[View the full topic](https://community.frame.work/t/external-monitors-hdmi-and-dp-alt-mode-not-working-on-linux/52849)._