DDCcontrol vs ExtLume
DDCcontrol
ddccontrol.github.ioExtLume
github.comSide by side
| Figure | DDCcontrol | ExtLume |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Windows | — | Yes |
| Linux | Yes | — |
| Plans published | 1 | 1 |
| Spec score · Monitor Control Software | 7.5 (#11) | 7.4 (#15) |
| Permissions | DDCcontrol needs readable and writable /dev/i2c-* devices to configure monitors. | The installer uses the current user's profile and does not request elevation; the app requires no administrator rights. |
| Purpose | DDCcontrol controls monitor brightness, contrast, color levels and other settings. | ExtLume is a Windows tray app for adjusting external monitor brightness when Windows provides a brightness slider only for the laptop panel. |
| Support | The project links users to its GitHub Issues page. | The maker directs users to GitHub Issues for general troubleshooting and recommends including app, Windows, laptop or GPU, monitor, connection path, control mode, and expected-versus-actual result in compatibility reports. |
Plans
In their own words
DDCcontrol
DDCcontrol is free Linux software for changing monitor brightness, contrast, color levels and other settings through DDC/CI. It offers a GTK interface for graphical control and a command-line tool for terminals, scripts and automation. Communication uses Linux’s i2c-dev interface and /dev/i2c-* devices, which must be readable and writable before monitors can be configured. USB-connected DDC/CI displays are not supported yet. A monitor database is required for monitor-specific controls and proper operation. The ddccontrol-scanmonitor utility reads a connected display’s EDID, capabilities and supported controls, and can generate a monitor database XML file; scanning does not alter control values. The maker’s database index lists 474 monitor profiles in release 20260928. Packages are listed for Debian/Ubuntu, Fedora and openSUSE, alongside source releases and source builds. The project uses the GNU General Public License version 2.0 and directs support questions to GitHub Issues.
ExtLume
ExtLume is a Windows tray app for adjusting external-monitor brightness when Windows provides a brightness control only for the laptop panel. It offers a separate slider for each safely identified active external display and shows its EDID model name. When the monitor and the full cable or dock chain support DDC/CI, the app changes the physical backlight. If that is unavailable, it can use a click-through dimming overlay on a safely isolated external desktop area; this changes the image but not backlight power. ExtLume handles multiple displays, mirrored groups, hot-plugging, and resume, while excluding built-in panels and virtual displays. It targets Windows 10 and Windows 11 and requires .NET Framework 4.8. The free, MIT-licensed public beta is available from GitHub Releases as a per-user installer or portable ZIP and requires no administrator rights. ExtLume says it works offline without telemetry or network requests. It stores limited local monitor and dimming data, and its controls are limited to brightness rather than arbitrary VCP commands, resets, or automatic display substitution.