fix(niri): pin the ultrawide to the 180 Hz mode its EDID actually offers
desk-1-home.kdl asked the Sceptre M34 for 3440x1440@239.999, a mode the panel has never offered. niri does not reject an unavailable mode: it logs "configured mode ... could not be found, falling back to preferred" and drives the EDID preferred mode - 60 Hz - on every connector event, which is why the monitor looked like it was dying rather than misconfigured. Read live with `niri msg outputs`, the mode list tops out at 180. Also destroys the copies of the phantom number: displays.md carried 239.999 in its diagram, its panel table and its copy-paste pattern block, and its rule 4 claimed an impossible mode leaves the output dark. Rule 4 now states the real failure mode, a new section separates config / DP-link / amdgpu-driver faults by log signature, and wlr-randr is corrected to not-installed (three pages claimed it; `pacman -Qs wlr` matches nothing). Applied live with `niri msg output <panel> mode <mode>` - the temporary per-output path, so no config reload and no logged-out session - verified at 3440x1440 @ 180.000 Hz with the compositor PID unchanged. Refs #58
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@@ -1,14 +1,14 @@
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---
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type: reference
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title: Display Configuration
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description: Niri output configuration on blankpad — EDID-identity-keyed desk profiles, hotplug auto-switching, portrait transforms, position pinning, and GPU notes (AMD Cezanne now; Intel Arc render-node pin is dankware-legacy).
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description: Niri output configuration on blankpad — EDID-identity-keyed desk profiles, hotplug auto-switching, portrait transforms, position pinning, the phantom-mode fallback trap, and GPU notes (AMD Cezanne now; Intel Arc render-node pin is dankware-legacy).
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tags:
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- niri
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- display
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- monitors
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- rotation
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- desk-profiles
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verified: 2026-10-09
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verified: 2026-10-21
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---
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# Display Configuration
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@@ -24,7 +24,11 @@ active profile (`desk-1-home.kdl`, `desk-2-portable.kdl`, …).
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`config.kdl` includes it with `include optional=true` so a missing link is a
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warning, not a parse failure.
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**Probe:** `niri msg outputs` is authoritative (connector, full EDID long
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name, modes, transform, scale, position, VRR). `wlr-randr` remains available.
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name, modes, transform, scale, position, VRR). Per-output changes go live with
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`niri msg output <name> <mode|scale|transform|position|off|on>` and are
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temporary — never written to the config file. `wlr-randr` is **not installed**
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on blankpad (`pacman -Qs wlr` matches nothing, verified 2026-10-21); pages that
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list it as an installed tool are stale.
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---
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@@ -33,7 +37,7 @@ name, modes, transform, scale, position, VRR). `wlr-randr` remains available.
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```
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┌──────────────┬──────────────────────────────┬──────────┐
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│ PM1601 │ Sceptre M34 ultrawide │ eDP-1 │
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│ portrait │ 3440x1440 @ 239.999 │ 1920x1080│
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│ portrait │ 3440x1440 @ 180.000 │ 1920x1080│
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│ 1200x1920 │ landscape, scale 1 │ scale 1 │
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│ rot 90 │ position 1581,-600 │ 5021,-240│
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└──────────────┴──────────────────────────────┴──────────┘
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@@ -42,7 +46,7 @@ name, modes, transform, scale, position, VRR). `wlr-randr` remains available.
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| Panel | EDID long name | Keyed by | Notes |
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|-------|----------------|----------|-------|
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| Sceptre M34 ultrawide | `Sceptre Tech Inc Sceptre M34 Unknown` | identity | `mode "3440x1440@239.999"`, `focus-at-startup` |
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| Sceptre M34 ultrawide | `Sceptre Tech Inc Sceptre M34 Unknown` | identity | `mode "3440x1440@180.000"` — the EDID maximum; no 240 Hz mode exists — `focus-at-startup` |
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| PM1601 portrait | *not captured* | connector `HDMI-A-1` | dock-dependent; run `desk.sh capture` when plugged in, then re-key |
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| eDP-1 laptop panel | `Lenovo Group Limited 0x40A9 Unknown` | identity | scale **1.0** (deliberate; Ghostty grid at 1.25 rejected 2026-10-09), second `focus-at-startup` |
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@@ -84,7 +88,7 @@ graph LR
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```kdl
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// desk-1-home.kdl — one block per panel, keyed by identity
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output "Sceptre Tech Inc Sceptre M34 Unknown" {
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mode "3440x1440@239.999"
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mode "3440x1440@180.000"
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scale 1
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transform "normal"
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position x=1581 y=-600
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@@ -98,6 +102,10 @@ Four rules learned the hard way:
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name *and* long name) fight over properties — transform reverts are the
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classic symptom. Desk profiles are self-contained: a panel's identity,
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mode, transform, **and** position live in exactly one block per file.
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`desk-1-home.kdl` still carries legacy connector-keyed `DP-1` / `DP-2`
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blocks next to the identity block. Their modes were aligned to 180 Hz on
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2026-10-21 so a connector-named reconnect cannot drop the panel to 120, but
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they belong folded into the identity block.
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2. **Key by EDID identity, not connector.** Connector names swap between
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docks; the EDID long name travels with the panel. Serials on these panels
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read `Unknown`, so the full long name (manufacturer model serial) is the
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@@ -105,8 +113,47 @@ Four rules learned the hard way:
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3. **Positions are absolute, not relational.** A disconnected panel leaves
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a hole; that is exactly why positions belong to the *desk profile*, not a
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global file.
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4. **Modes must match what the panel reports** (`niri msg outputs` →
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`Mode: current …`). A mode the panel cannot drive leaves the output dark.
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4. **Ask only for modes the panel reports** (`niri msg outputs` → `Mode:` list).
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A mode the panel never offered does **not** leave the output dark: niri logs
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`configured mode … could not be found, falling back to preferred` and quietly
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drives the panel at its EDID *preferred* mode — **60 Hz** on the M34. Nothing
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looks broken except the refresh rate, and every reconnect repeats the
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fallback. Check Hz, not just resolution, after any "monitor is acting up".
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## "The monitors are broken" — three layers, three signatures
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A display complaint belongs to one of three layers. Sort it before editing
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config, because the config is usually innocent — and when it is guilty, the
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guilt may have been copied from this page.
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| Layer | Log signature | Reality | Move |
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|-------|---------------|---------|------|
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| Config | `configured mode … could not be found, falling back to preferred` | a mode/scale the panel never offered | re-read the mode list with `niri msg outputs` and correct the file; do **not** trust a documented mode |
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| Link | `disconnecting connector: "DP-1"` followed seconds later by `new connector: DP-1`, recurring | the DP link itself dropping — cable, dock, the monitor's DP-version/DSC setting, or panel power saving | every drop re-runs mode selection, so a config error is re-enacted in public; swap the cable before blaming the compositor |
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| Driver | `Page flip commit failed … (Invalid argument)` plus kernel `*ERROR* … DMCUB error` | amdgpu's display engine wedged, typically after an s2idle resume | survives until a reboot; niri keeps running while the panel keeps dropping. No config edit clears it |
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Probes, in this order:
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```bash
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niri msg outputs # connector, EDID long name, real mode list, current mode
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journalctl --user -b | grep -E 'disconnecting connector|Page flip commit failed|falling back to preferred'
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journalctl -k -b | grep -iE 'amdgpu.*(ERROR|DMCUB)|PM: suspend exit'
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```
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Correlate the drop timestamps against `PM: suspend exit` first. A resume a
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minute before the first drop is the cause; the config file is not.
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To fix a refresh rate without disturbing the session, use the temporary
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per-output path — it touches one output, applies no config, reloads nothing:
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```bash
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niri msg output "Sceptre Tech Inc Sceptre M34 Unknown" mode "3440x1440@180.000"
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```
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It is temporary by design, so correct the profile too and let the next
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reconnect or `load-config-file` make it permanent. With the display engine
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already throwing `EINVAL`, prefer the per-output path over a full config
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reload; on a healthy machine either is fine.
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## GPU assignment
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@@ -132,4 +179,4 @@ symlink matrix]]).
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- [Niri](/tools/niri/index.md) — compositor overview and config layout
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- [[tips|tips]] — reload path, `niri msg layers/casts`, includes
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- [[noctalia-shell|noctalia-shell]] — notification shown on desk switch
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- [[cachyos|cachyos]] — operating system, including `wlr-randr`
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- [[cachyos|cachyos]] — operating system
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