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Credit original source of EDID hack

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Wesley Moore 2020-06-02 08:16:33 +10:00
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v2/content/posts/2020/linux-amdgpu-pixel-format.md
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@ -3,7 +3,7 @@ title = "Setting the amdgpu HDMI Pixel Format on Linux"
date = 2020-05-30T08:48:30+10:00 date = 2020-05-30T08:48:30+10:00
[extra] [extra]
updated = 2020-05-30T11:21:30+10:00 updated = 2020-06-02T08:15:44+10:00
+++ +++
This week I discovered some details of digital display technology that I was This week I discovered some details of digital display technology that I was
@ -67,12 +67,13 @@ HDMI output to RGB.
### The Fix ### The Fix
It was at this point I found [this Reddit post][reddit-pixel-format] with a It was at this point I found [this Reddit post][reddit-pixel-format] describing
fairly terrible hack: Copy the [EDID] of the display and modify it to make it a terrible hack, originally described by Parker Reed in [this YouTube
seem like the display only supports RGB. The `amdgpu` driver then chooses that video][edid-edit-video]: Copy the [EDID] of the display and modify it to make
format instead. Amazingly enough it worked! I also haven't experienced the it seem like the display only supports RGB. The `amdgpu` driver then chooses
screen blanking issue since swapping cables. I can't say for sure if that is that format instead. Amazingly enough it worked! I also haven't experienced
fixed but the HDMI cable is now further away from interference from my Wi-Fi the screen blanking issue since swapping cables. I can't say for sure if that
is fixed but the HDMI cable is now further away from interference from my Wi-Fi
router, so perhaps that helped. router, so perhaps that helped.
The following are the steps I took on Arch Linux to use a modified EDID: The following are the steps I took on Arch Linux to use a modified EDID:
@ -115,3 +116,4 @@ looking much brighter! 🤞 the display blanking issue remains fixed as well.
[EDID]: https://en.wikipedia.org/wiki/Extended_Display_Identification_Data [EDID]: https://en.wikipedia.org/wiki/Extended_Display_Identification_Data
[wxEDID]: https://aur.archlinux.org/packages/wxedid [wxEDID]: https://aur.archlinux.org/packages/wxedid
[systemd-boot]: https://wiki.archlinux.org/index.php/Systemd-boot [systemd-boot]: https://wiki.archlinux.org/index.php/Systemd-boot
[edid-edit-video]: https://www.youtube.com/watch?v=tYYMiX7dlak