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docs(niri): portable desk runs landscape, HDMI left of the laptop

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record the normalized layout that landed on main as 9b88208 and the law
that surprised it: positions are absolute, so rotating a panel widens
its logical box and every x to the right of it moves — recompute the
row, never just the rotated block.
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Frank committed 2026-10-30 15:56:39 -07:00
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omp-docs/tools/niri/displays.md
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@@ -60,20 +60,28 @@ the ultrawide wins when present and the laptop panel is the fallback.
## The desk-2 rig (portable)
Laptop plus two 16" PM1601 panels in portrait, side by side as one 2400x1920
band. Profile: `cfg/desk-2-portable.kdl` (`display.kdl` symlinks to it).
Laptop flanked by the two 16" PM1601 panels, all three landscape. Profile:
`cfg/desk-2-portable.kdl` (`display.kdl` symlinks to it).
```
┌──────────────┬──────────┬──────────┐
│ │ PM1601 │ PM1601 │ eDP-1 1920x1080 normal x=0,y=420
│ │ rot 90 │ rot 90 │ DP-2 1200x1920 rot 90 x=1920,y=0
│ eDP-1 │ 1200x1920│ 1200x1920│ HDMI-A-1 1200x1920 rot 90 x=3120,y=0
│ 1920x1080 │ (DP-2) │(HDMI-A-1)│
│ │ │ │ The laptop is pinned 420 px down so its
└──────────────┴──────────┴──────────┘ centre (960) meets the band's centre:
x=0,y=420 x=1920,0 x=3120,0 no dead corner when the cursor crosses.
┌──────────┬──────────────┬──────────┐
│ PM1601 │ │ PM1601 │ HDMI-A-1 1920x1200 normal x=0,y=0
│ 1920x1200│ eDP-1 │ 1920x1200│ eDP-1 1920x1080 normal x=1920,y=60
│(HDMI-A-1)│ 1920x1080 │ (DP-2) │ DP-2 1920x1200 normal x=3840,y=0
│ │ │ │
└──────────┴──────────────┴──────────┘ The laptop is 60 px down so it is
x=0,y=0 x=1920,y=60 x=3840,y=0 centred against the taller panels.
HDMI-A-1 sits to the LEFT of the laptop by request (2026-10-30); DP-2 keeps the
right. Earlier the same rig ran both panels in portrait (rot 90, 1200x1920) with
the laptop and both panels to its right — the rotation is `normal` now, so the
panels are 1920 wide and every x moved.
```
Positions are absolute in logical space, so rotating a panel changes its logical
width (1200 → 1920) and every x to its right; recompute the whole row, never just
the rotated block.
All three blocks are identity-keyed and pin their mode string verbatim. The
`requires:` list names all three panels, so the matcher only claims this profile
when the whole rig is present — unplug one 16" panel and the watcher leaves the