I've an i915 Intel laptop running Oracular, but i can't reproduce the
issue:

```
[    0.321780] ACPI: bus type drm_connector registered
[    0.330979] [drm] Initialized simpledrm 1.0.0 for simple-framebuffer.0 on 
minor 0
[    0.333513] simple-framebuffer simple-framebuffer.0: [drm] fb0: 
simpledrmdrmfb frame buffer device
[  277.421832] systemd[1]: Starting [email protected] - Load Kernel Module 
drm...
[  277.465174] systemd[1]: [email protected]: Deactivated successfully.
[  277.465518] systemd[1]: Finished [email protected] - Load Kernel Module 
drm.
[  279.477357] i915 0000:00:02.0: [drm] Found BROADWELL/ULT (device ID 1616) 
display version 8.00 stepping N/A
[  279.516954] [drm] ACPI BIOS requests an excessive sleep of 25000 ms, using 
1500 ms instead
[  280.076369] [drm] Initialized i915 1.6.0 for 0000:00:02.0 on minor 1
[  280.175032] fbcon: i915drmfb (fb0) is primary device
[  280.175042] i915 0000:00:02.0: [drm] fb0: i915drmfb frame buffer device
```

$ ls -la /dev/dri/card*
crw-rw----+ 1 root video 226, 1 Oct 10 20:21 /dev/dri/card1

$ ls -la /dev/dri/by-path/
lrwxrwxrwx 1 root root   8 Oct 10 20:21 pci-0000:00:02.0-card -> ../card1

$ lspci
...
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09)

the interesting bit is that my i915 GPU is marked as card1, and not
card0 (e.g. simpledrm was loaded earlier, attached as card0 but later
unloaded?)

-- 
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https://bugs.launchpad.net/bugs/2084046

Title:
  [i915] Phantom "Unknown" display detected

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