203 lines
11 KiB
Markdown
203 lines
11 KiB
Markdown
# Displays
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**Settings → Displays** shows the current arrangement, live resolution, refresh rate, scale and connection status. Save the current desktop as a named profile, rename or remove profiles, and configure resolution, refresh policy, scale, rotation/reflection and logical pixel position for each output. Unique hardware identities are preferred over connector names; identical monitors fall back to their current connectors. The arrangement diagram selects outputs but does not drag them.
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Hardware changes use the compositor confirmation timeout. **Keep changes** accepts them; **Revert changes** restores the previous runtime arrangement and the display configuration captured before the first edit. **Restore previous display configuration** remains available for the source configuration after an automatic runtime rollback. Other settings and their comments are preserved. Nested sessions show the host-managed output and save configuration only; test physical modes and positioning in a standalone session.
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## Color temperature
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Night light warms the display using its hardware gamma ramp. It is off by default.
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Set its state and temperature in `config.kdl`:
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```kdl
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night-light {
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enabled #false
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temperature 4500
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}
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```
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The temperature range is 1000–6500 K. Lower values are warmer. At 6500 K, the
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display keeps its neutral color.
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The panel's **Night light** item opens an on/off switch and temperature slider.
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In Morph, the button stays beside the tabs when you expand the panel, even if
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you remove the Night light item from your panel layout. Quick Settings has the
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same controls. The toggle saves immediately. Releasing the slider saves its
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temperature in the config.
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Night light applies to all supported connected displays, including mirror targets.
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It requires a DRM session. A nested session cannot change the host display's colors.
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There is no automatic schedule yet.
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### External gamma-control clients
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Ferese supports `wlr-gamma-control-unstable-v1` on DRM outputs with hardware
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gamma ramps. A gamma-control client can adjust the display's color temperature.
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Only one client can control each output at a time. While that client remains
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connected, Ferese reapplies its gamma table after display sleep or a session
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switch. Closing the client restores the previous table.
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Nested outputs and hardware without gamma-ramp support report that gamma control
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is unavailable. This protocol does not provide ICC profiles or HDR color management.
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When you turn on night light, Ferese takes control of the gamma tables and sends
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external controllers `failed`. These clients must request gamma control again
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after you turn it off. New requests are rejected while night light is on.
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## Output profiles
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Each `output-profile` needs a unique, nonempty `name` and at least one `output`
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entry. A profile matches when every required monitor is connected and its
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optional `lid-closed` condition matches. The profile with the most required
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monitors wins; ties use config order. If none matches, Ferese extends across all
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usable connected monitors. Find selectors with `feresectl outputs`.
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| `output-profile` key | Type | Default |
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| --- | --- | --- |
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| `name` | unique nonempty string | required |
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| `layout` | `internal-only`, `external-only`, `extend`, `mirror` | `extend` |
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| `lid-closed` | boolean | either lid state |
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| `mirror-source` | selector of an enabled output in this profile | first enabled hardware key |
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| `lid-policy` | `dock-or-suspend`, `ignore` | `dock-or-suspend` |
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| `confirm-timeout` | seconds; `0` disables confirmation | `15` |
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| `output-profile → output` key | Type | Default |
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| --- | --- | --- |
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| `match` | nonempty connector or persistent identity string | required; unique within profile |
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| `required` | boolean | `true`; set `false` for an optional monitor |
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| `enabled` | boolean | `true` |
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| `mode` | `"WIDTHxHEIGHT"` or `"WIDTHxHEIGHT@HZ"` | Preferred mode |
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| `auto-refresh` | boolean | `false` |
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| `scale` | number > 0 | `1` |
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| `transform` | enum below | `"normal"` |
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| `position` | `[integer, integer]` | Automatic horizontal placement |
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Transforms: `normal`, `rotate-90`, `rotate-180`, `rotate-270`, `flipped`,
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`flipped-90`, `flipped-180`, `flipped-270`. In extend and mirror profiles,
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unlisted monitors stay enabled with defaults. Internal-only and external-only
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filter by connector type. A layout that would disable the final usable display
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falls back to a working display. Profiles that explicitly disable all their
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listed outputs are invalid.
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`required` controls whether a profile matches when a monitor is absent. Every
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connected monitor enabled by the resolved policy, including optional monitors
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and mirror targets, needs its own compatible CRTC assignment. Ferese rejects an
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incomplete assignment before applying the configuration. A complete assignment
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still needs to pass driver validation; connector compatibility alone does not
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establish that the hardware accepts the modes and planes.
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Monitor identities use EDID manufacturer, product/model and serial, rather than
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a hash of the entire EDID. Without a usable serial, the identity includes the
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GPU's sysfs hardware path and connector. For duplicate serials, Ferese adds the
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same path and connector to distinguish the monitors. If both arrive together,
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both identities include those details. If the second arrives later, the first
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keeps its identity and only the second gets the path and connector. Ferese
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remembers that choice for the compositor session. Without serials, Ferese
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identifies monitors by port and cannot tell them apart if you swap their ports.
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Connector names and old `drm-edid:` selectors still work. Ambiguous or
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overlapping selectors are rejected during live reload. A disconnected identity
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can remain in config; it prevents matching only when its entry has
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`required=#true`.
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```kdl
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output-profile "desk" layout="external-only" {
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output "DP-1" mode="2560x1440@60" scale=1.25
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output "eDP-1" required=#false enabled=#false
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}
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output-profile "mobile" layout="internal-only" {
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output "eDP-1" scale=1.75
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}
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output-profile "presentation" layout="mirror" mirror-source="eDP-1" {
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output "eDP-1" scale=1.75
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output "HDMI-A-1" mode="1920x1080@60"
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}
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```
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Mirror uses the source's logical size, workspace, layers and pointer. Targets
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own no workspaces or separate pointer region. Ferese fits the complete source
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into each target's transformed physical mode, preserving aspect ratio and
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letterboxing instead of cropping. Target scale does not resize the source
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layout. Each target has its own hardware cadence; only the source releases
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client frame callbacks and presentation feedback. Mirrored monitors are listed
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by `outputs`, but expose one logical output to clients and the shell. If a required mirror target disconnects, Ferese selects another matching
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profile or extends across all usable connected monitors. Leaving mirror
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restores evacuated workspaces.
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```sh
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feresectl outputs
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feresectl output-profiles
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feresectl toggle-display-mode
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feresectl output-layout extend
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feresectl output-profile presentation
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feresectl output-confirm
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feresectl output-profile auto
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feresectl output-internal off
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feresectl output-revert
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```
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The display Fn key (`XF86Display`) and the bar’s display icon open the same
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display-mode chooser. The icon appears while an external monitor is connected.
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`output-layout` selects a layout without requiring a named profile and keeps
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the matching profile’s mode, scale and transform settings.
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A manual choice overrides automatic selection until the monitor set or lid
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state changes. Reload keeps it only if its profile still exists and matches.
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Manual changes revert after `confirm-timeout` seconds unless confirmed;
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`output-revert` restores immediately. Reverting restores the last confirmed modes,
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scales, transforms and positions, even if you make several changes before
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confirming. The timeout still applies if the client that made the change exits. Automatic hotplug/lid changes never wait for confirmation.
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Disabling the last usable internal panel is rejected.
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```kdl
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output-profile name="docked" {
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output match="HDMI-A-1" scale=1.5 {
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position 0 0
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}
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}
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```
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Settings → Displays offers the connected display's supported refresh rates at
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its configured resolution. Choosing a rate saves it and disables Auto. Choosing
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Auto saves the highest supported rate as the normal mode and enables automatic
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switching. These choices apply immediately for the active profile and persist
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across restarts.
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With `auto-refresh=#true`, a discharging system battery below 30% switches the
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display to a supported mode within 1 Hz of 60 Hz at the same resolution. The
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configured normal mode returns on external power or when the battery reaches
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35%. Power is checked every five seconds; mode changes only run when the policy
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changes. Unavailable battery data restores normal refresh. If no matching 60 Hz
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mode exists, normal refresh is retained. Rejected DRM mode changes retain the
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current output. A refresh-rate change can briefly blank the display (about one
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second on some panels), including automatic changes below 30%, recovery at 35%,
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and restoration on AC. Session activation refreshes lid and connector state
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before rendering; unchanged outputs retain their handles and workspaces.
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Hotplug bursts settle for 150 ms before one reconciliation. Ferese records changes that arrive while the session is inactive and applies
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them on activation.
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```kdl
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output-profile laptop {
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output eDP-1 mode="2880x1800@120" scale=1.75 auto-refresh=#true
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}
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```
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With a usable external display, closing the lid disables internal panels after
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external activation succeeds. Without one, Ferese asks logind to suspend,
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respecting sleep inhibitors. `lid-policy="ignore"` disables this behavior for
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the selected profile. Resume reads lid state from logind, with ACPI fallback,
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before reconciling fresh hardware. Ferese releases its logind lid inhibitor on
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session pause, so logind handles the lid while another session or TTY is active.
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Workspaces keep their home output and return when it reconnects, unless you
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reassigned or deleted them after evacuation. Floating
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windows are remapped and clamped to the surviving display.
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On atomic DRM, Ferese tests the complete configuration for each GPU before
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changing it.
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Smithay performs the real commits; logical changes follow successful hardware
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application. Failed commits attempt restoration, and outputs that cannot be
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restored are removed from logical state. Each GPU commits separately. If a later GPU fails, Ferese attempts to restore
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the earlier GPUs. Legacy KMS lacks atomic
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test-only validation. Hardware failures can still leave the session without a working monitor; Ferese tries preferred modes to recover a display instead of
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intentionally turning off the last working one.
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