## Summary

When a display is connected via a USB-C dock (Satechi) and then unplugged and reconnected, the Intel i915 GPU driver fails to re-detect the display. The display remains disconnected until the system is rebooted.

## Hardware

- **Omarchy Version:** 4.0.4-1
- **Kernel:** 7.2.3.arch1-3
- **Hyprland:** 0.56.2-2
- **Laptop:** Omarchy running on Intel UHD Graphics (Raptor Lake-P)
- **Dock:** Satechi USB-C dongle
- **Monitor:** Dell P2417H (connected via HDMI through dongle)

## Steps to Reproduce

1. Connect a monitor via USB-C dock (e.g., Satechi dongle → HDMI)
2. Verify monitor is working (`hyprctl monitors all` shows it)
3. Unplug the USB-C dock
4. Plug the USB-C dock back in
5. Run `hyprctl monitors all` — monitor is no longer detected

## Expected Behavior

The display should be re-detected and become available in `hyprctl monitors all`

## Actual Behavior

- `hyprctl monitors all` shows only the laptop display (eDP-1)
- `modetest -c` shows all output ports (DP-1, DP-2, HDMI-A-1) as disconnected
- `/sys/class/drm/card2-DP-1/status` reads "disconnected"
- `/sys/class/drm/card2-DP-1/edid` is empty (driver didn't read monitor EDID)
- Running `hyprctl reload` has no effect
- Full system reboot is required to re-detect the display

## Root Cause

This is a **kernel/i915 driver issue**, not Hyprland. Evidence:

- The i915 driver fails to detect the display at the DRM level (before Hyprland even loads)
- Even `modetest` (a userspace tool that directly queries DRM) shows the display as disconnected
- USB devices on the dock ARE re-detected (lsusb shows the Satechi USB hubs reconnecting)
- Only the display output is not re-detected

## Workarounds Attempted

- `hyprctl reload` — no effect
- Manual `modetest -r` — no effect
- GPU power cycle via sysfs — no effect
- udev/systemd hotplug detection scripts — doesn't help (driver never detects)
- Reboot — **WORKS**

## Timeline

This issue appeared after updating to kernel 7.2.3.arch1-3 and Hyprland 0.56.2-2 on September 9, 2026. It was working on previous kernel versions.

## Notes

- This issue affects any USB-C/Thunderbolt docking station, not just Satechi
- Related issue: #13119 (AMD amdgpu USB-C dock issue on kernel 7.2.5)
- The underlying cause is that the Intel i915 driver doesn't trigger hotplug detection when displays are reconnected via USB-C docks
- This is likely a kernel or i915 driver regression, not an Omarchy issue, but it significantly impacts Omarchy users with USB-C docks