NixOS hyprland fails to start

[TotalTaxAmount]

Already reported ? *

• I have searched the existing open and closed issues.

Regression?

Probably not a regression / I don't remember it happening before

System Info and Hyprland Version

System/Version info

Hyprland 0.47.0 built from branch  at commit f261fb6fe028a1427cfd672eee6e7d5705cd696f  ().
Date: 2025-02-09
Tag: v0.47.0, commits: 5805
built against:
 aquamarine 0.7.2
 hyprlang 0.6.0
 hyprutils 0.5.0
 hyprcursor 0.1.11
 hyprgraphics 0.1.1


no flags were set


System Information:
System name: Linux
Node name: laptop
Release: 6.13.2-cachyos
Version: #1-NixOS SMP PREEMPT_DYNAMIC Sat Feb  8 09:02:27 UTC 2025


GPU information: 
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation AD106M [GeForce RTX 4070 Max-Q / Mobile] [10de:2860] (rev a1) (prog-if 00 [VGA controller])
65:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Phoenix3 [1002:1900] (rev cb) (prog-if 00 [VGA controller])
NVRM version: NVIDIA UNIX x86_64 Kernel Module  570.86.16  Fri Jan 24 21:25:51 UTC 2025


os-release: ANSI_COLOR="0;38;2;126;186;228"
BUG_REPORT_URL="https://github.com/NixOS/nixpkgs/issues"
BUILD_ID="25.05.20250208.fa35a3c"
CPE_NAME="cpe:/o:nixos:nixos:25.05"
DEFAULT_HOSTNAME=nixos
DOCUMENTATION_URL="https://nixos.org/learn.html"
HOME_URL="https://nixos.org/"
ID=nixos
ID_LIKE=""
IMAGE_ID=""
IMAGE_VERSION=""
LOGO="nix-snowflake"
NAME=NixOS
PRETTY_NAME="NixOS 25.05 (Warbler)"
SUPPORT_URL="https://nixos.org/community.html"
VARIANT=""
VARIANT_ID=""
VENDOR_NAME=NixOS
VENDOR_URL="https://nixos.org/"
VERSION="25.05 (Warbler)"
VERSION_CODENAME=warbler
VERSION_ID="25.05"


plugins:
	unknown: not runtime

Description

When trying to start Hyprland (not after update or anything) it now refuses to start, just hanging the login screen or tty. The only thing that I did was plug in a external monitor into HDMI, it was behaving weirdly but after I unplugged it the internal display on my laptop doesn't work with Hyprland. I tried reverting to a previous config via my nix config but even reverting to something I know worked in the past did not fix the issue.

How to reproduce

1. Plug in external monitor to HDMI?
2. Start Hyprland
3. Unplug and restart Hyprland

Attach not paste

• I understand that all text files must be attached, and not pasted directly. If not respected, this issue will likely get closed as spam

Checklist of files to include below

• Hyprland config - hyprctl systeminfo -c (always include)
• Crash report (always include in case of crash)
• Video (always include in case of a visual bug)
• Logs (might contain useful info such as errors)

Additional info & File uploads

Logfile: https://paste.c-net.org/ClaricePrevail
Config (generated via nix): https://paste.c-net.org/WandaScrewed

[nnyyxxxx]

try building from latest commit

edit -

[LOG] Switching from VT 2 to VT 4
[ERR] [AQ] GBM: Allocating with modifiers failed, falling back to modifier-less allocation
[ERR] [AQ] GBM: Failed to allocate a GBM buffer: bo null
[ERR] [AQ] Couldn't allocate a gbm buffer

tbh just from this spam, probs not an issue with hyprland

[TotalTaxAmount]

Same issue on 6d25ef0 logfile looks the same at first glance. What about this stuff?

[ERR] renderer: couldn't beginRender()!
[ERR] Failed to acquire swapchain buffer for eDP-1

[TotalTaxAmount]

Appears the issue is Hyprland was trying to start on my laptops dedicated GPU, using AQ_DRM_DEVICES to tell it to run on the iGPU fixes the issue. However, card0 and card1 seem to switch between boots (card0 is amdgpu, next boot card0 is the nvidia gpu), is there a way to tell Hyprland to always use the iGPU other than AQ_DRM_DEVICES

[ikalco]

@TotalTaxAmount try aquamarine-git

cause this commit prob fixes choosing the igpu

[GameDungeon]

I think my (Nixos) desktop is currently loading off integrated graphics instead of my actual GPU. How can I use aquamarine-git if I am using hyprland from the flake? I should already be using that correct?

Edit: Swapping to the closed source drivers resolved this issue for me. I think this one was on nvidia.

[mattkang]

Appears the issue is Hyprland was trying to start on my laptops dedicated GPU, using AQ_DRM_DEVICES to tell it to run on the iGPU fixes the issue. However, card0 and card1 seem to switch between boots (card0 is amdgpu, next boot card0 is the nvidia gpu), is there a way to tell Hyprland to always use the iGPU other than AQ_DRM_DEVICES

Instead of using card0 and card1, you can create symlinks for

/dev/dri/by-path/pci-0000:XX:XX.X-card