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How to change monitor contrast, speaker volume and power from Windows

Brightness is not the only setting hidden behind the small buttons on the back of a monitor. Contrast, the color mode, the volume of the built-in speakers, mute and even the power state can usually be changed from the PC over DDC/CI, the same standard WindowLayout already uses for hardware brightness and input switching. This guide shows how to see what each of your monitors offers, change those settings from the Brightness page, turn a monitor to standby without losing it, and get the picture back at once if a screen was dimmed too far.

Updated 6 steps

  1. Check that the monitor answers DDC/CI

    Open the on-screen menu of the monitor with its buttons and make sure DDC/CI is turned on; it usually sits under System, Setup or Others. Connect the monitor directly to the graphics card or to a dock that passes DDC/CI through. DisplayLink adapters, many KVM switches, HDMI splitters and most TVs do not pass these commands. Laptop screens never use DDC/CI: their brightness is handled by Windows itself, so the controls described here are for external monitors only.

  2. See what each monitor offers

    Open WindowLayout and go to the Brightness page. Below the monitor cards, the Monitor controls (DDC/CI) section reads every connected monitor once. It asks the monitor for its capabilities list, which is the monitor's own description of the settings it accepts, and shows contrast, color mode, speaker volume, mute and power for each screen. Anything the monitor does not list is greyed out with the reason, for example that the monitor does not offer it or did not answer. The first read can take a few seconds on slow monitors; Read again asks once more after you change something in the monitor menu.

  3. Change contrast and color mode

    Drag the Contrast slider to change the monitor's own contrast in percent of its range. The Color mode list shows only the presets your monitor reports, such as sRGB, Native, 6500 K or User 1, so you never pick a value the monitor does not understand. Some monitors lock contrast or brightness in certain picture modes, like sRGB or an eco mode; if a change seems to do nothing, switch the color mode first. Monitors do not confirm DDC/CI changes, so WindowLayout shows what it sent and leaves the rest to the monitor.

  4. Control the monitor speakers

    Monitors with built-in speakers or a headphone jack usually accept Speaker volume and Mute over DDC/CI. Use them when the monitor is the only speaker on your desk, or to silence a side screen that plays sound through HDMI or DisplayPort. The volume here is the monitor's own volume; the Windows volume mixer still controls the sound that the PC sends. To protect slow monitors, WindowLayout waits 2 seconds between two changes to the same monitor. While you drag a slider it simply sends the last position once that pause is over.

  5. Put a monitor to standby or off safely

    The Power buttons show the states your monitor lists: On, Standby, Suspend or Off. Choosing anything other than On asks for confirmation first, because the picture on that monitor goes away. Many monitors wake up again by themselves or from the On button, but some stop listening to DDC/CI while they are off and can only be turned on with their own power button, so try it once while you can reach the monitor. If you only want a dark side screen for a while, Blackout this monitor on the Monitors page is the safer choice.

  6. Reset software dimming when a screen is too dark

    Software dimming darkens monitors without hardware brightness with a see-through overlay, and together with blackout or focus fade it can make a screen hard to read. The Software dimming card at the top of the Brightness page has Reset to normal: it sets dimming to 0 on every monitor, removes the dark overlays and turns off blackout and focus fade. Undo reset puts everything back once. If you cannot see the button, press the emergency key Ctrl+Alt+Shift+0 or use Turn off dimming in the tray menu. WindowLayout never changes the graphics card's color settings, so quitting it also brings the original picture back.

Frequently asked questions

Why is a control greyed out for my monitor?

The monitor did not list that setting in its capabilities, or it did not answer at all. Check that DDC/CI is on in the monitor menu, connect it without adapters or KVM switches, and press Read again. Settings a monitor does not offer cannot be changed over DDC/CI.

I turned a monitor off and it does not come back. What now?

Press the On button in WindowLayout first. If the monitor stopped listening while it was off, press the power button on the monitor itself. Your windows and settings are not affected; the monitor simply comes back where it was.

Can the phone remote or the AI assistant change these settings?

No. These DDC/CI controls are only on the Brightness page of the PC. The phone remote can still turn a monitor's display output on or off as before, but neither it nor an AI plan can send contrast, color mode, volume or power commands to a monitor.

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