COSMIC Desktop 1.8 Arrives with a Rewritten Compositor, Tablet Emulation, and Greeter Fixes

System76 tagged COSMIC Epoch 1.8.0 on September 9, 2026, the latest coordinated snapshot of its Rust-built Linux desktop environment. The release focuses primarily on the compositor — cosmic-comp — with additions that expand input device handling and inter-process clipboard sharing.

What Changed in the Compositor

The headline addition is tablet emulation support, letting the compositor translate trackpad or mouse input into stylus-style signals that drawing and design applications understand as a tablet device. Alongside that, COSMIC Epoch 1.8 adds libei pasteboard sharing, which enables applications and remote input tools to exchange clipboard content through the libei protocol — filling a gap that had left some Wayland-based remote-control and accessibility tools unable to paste reliably into COSMIC sessions.

A new corner radius protocol for rounded window borders was also added, giving application developers a standardized way to declare their preferred corner rounding rather than relying on compositor-side heuristics.

Outside the Compositor

The rest of the release is maintenance and quality-of-life work. Bluetooth device alias handling was improved, reducing the frequency of generic device names appearing where a user-assigned alias should show. The audio source volume slider received a targeted fix. Most notably for shared machines, the greeter now supports multi-factor PAM login chaining — meaning it can handle authentication flows that require a password plus a second factor, such as a TOTP code, without needing a workaround.

According to the release notes on Linux Compatible, the 1.8.0 tag pins more than twenty independently developed COSMIC submodules together in a single tested snapshot — which is what the "Epoch" label means in System76's release model.

Context and Cadence

COSMIC 1.8 arrived two weeks after COSMIC 1.7, maintaining the project's steady cadence of incremental releases. The environment remains in active development, with each Epoch release solidifying stability across the Rust-based stack. The project builds every component — compositor, app launcher, file manager, settings — in Rust, targeting a smaller attack surface and more predictable memory behavior than traditional C-based desktop stacks.

The tablet emulation support is particularly relevant for Pop!_OS users running drawing software. Previous COSMIC releases had limited support for touchpad-as-tablet workflows that tools like Krita and Inkscape support on other compositors. The libei change also has accessibility implications: libei is increasingly used by on-screen keyboards and switch access tools to interact with Wayland desktops, and full pasteboard support removes a friction point for those workflows.

For anyone already running COSMIC, the 1.8 update lands through the usual System76 channels and Pop!_OS repositories.