FrameworkComputer/SoftwareFirmwareIssueTracker

Laptop 16 will not work with 2-lane eDP v1.2 display

Opened this issue · 2 comments

CDRXavier commented

Device Information

  • Framework Laptop 16 (AMD Ryzen™ 7040 Series)

BIOS VERSION

Please provide the bios version.
3.0.5

Device Information

System Model or SKU

  • Framework Laptop 16 (AMD Ryzen™ 7040 Series)

BIOS VERSION

Please provide the bios version.

3.0.5

DIY Edition information

If you are experiencing an issue on a DIY system, Please also fill out the memory and storage devices you are using.

Memory: Crucial CT16G56C46S5

Storage:

  1. Samsung MZ9LQ512HBLU-00B00
  2. TEAM TM8FP6002T
  3. TEAM TM8FP6002T (dual m.2 carrier)
  4. TEAM TM8FP6002T (dual m.2 carrier)

Port/Peripheral information

If you are experiencing an issue with a peripheral or an expansion card/port please fill out the following information:

  1. USB-C
  2. USB-A
  3. USB-A
  4. USB-C
  5. USB-A
  6. USB-A

Standalone Operation

Are you running your mainboard as a standalone device. Is standalone mode enabled in the BIOS?

  • No

Describe the bug

When a 2-lane eDP v1.2 panel is connected (160UAK 01.5), the display does not work. it does not turn on. The laptop will instead POST to a external display if provided.

The pinout should be correct, so I am not sure what went wrong.
Image

Note that framework technically have a "flipped" mainboard connector with the reverse wire order, but this is unimportant.
~

Operating System (please complete the following information):

  • OS/Distribution: Windows 10 22H2, Windows 11 24H2, Ubuntu 24.04, BIOS
JohnAZoidberg commented

Other users have been successful using a 2 lane eDP display.
Does the information here help?
https://community.frame.work/t/40pin-edp-framework-4lane-to-30pin-edp-2-lane/38745

CDRXavier commented

Other users have been successful using a 2 lane eDP display. Does the information here help? https://community.frame.work/t/40pin-edp-framework-4lane-to-30pin-edp-2-lane/38745

@JohnAZoidberg

No it does not. Well. Sort of.
The framework 16 feature a DP MUX/Switch, and it probably dont like having a 2-lane display with 4-lane sources connected. That, or my display and cable is just gone.
I need to be able to configure the mux and put it in a specific way so it will work with mismatched lanes, presumably by telling it through some kind of communication protocol (however I do not see it in the schematic). Unless Framework don't have such a thing for the mux, but it should, because of the nature of the switchable graphics. Unless it's done by the graphics cards. Which, technically is still initialized by the BIOS, so it leave room for configurability.
I will be borrowing my friends' framework 13s for tests, since the 16 and 13 use the same connector. Should be a relatively low-risk endavor.