78:T1693, ## Description On Linux, absolute mouse input lands in the wrong place when any monitor sits left of (or above) the layout origin. Hyprland maps an absolute pointer device across the bounding box of all monitors, starting at the leftmost/topmost edge. The KMS and wlroots capture backends size the input environment as `max(offset + size)` and never set `env_offset_x/y`, so the environment is assumed to start at 0. With a monitor at a negative offset, every absolute move is shifted toward that monitor and squeezed, and the far edge of the streamed display can't be reached. Example layout (Hyprland 0.56.2, KMS capture of `HDMI-A-1`): | Output | Logical position | Logical size | | --- | --- | --- | | HDMI-A-1 (streamed) | 0x0 | 3840x2160 | | DP-1 | -2560x360 | 2560x1440 | | DP-4 (portrait, scale 1.5) | 3840x0 | 1440x2560 | Measured host cursor x for client absolute moves at 0 / 25 / 50 / 75 / 99.9% of the stream width (y unaffected here): | | 0% | 25% | 50% | 75% | 99.9% | | --- | --- | --- | --- | --- | --- | | v2026.914.233613 | -2560 | -1134 | 292 | 1719 | ~3142 (max reachable) | | v2026.1018.5342 + this PR | -1 | 960 | 1920 | 2880 | 3836 | This PR computes the environment as the monitors' bounding box (origin and size) in `kmsgrab.cpp` and `wlgrab.cpp`, which is what the macOS backend already does with `env_offset_x/y`. A small `desktop_bounds` helper shared by both backends does the math. Layouts whose monitors all start at 0 are unchanged: the origin stays 0 and the size equals the old `max(offset + size)`. ### Screenshot ### Issues Fixed or Closed #### Roadmap Issues ## Testing - Added `tests/unit/platform/linux/test_desktop_bounds.cpp`: empty layout, a layout at the origin (unchanged), a monitor left of the origin (the layout above), a monitor above the origin, and monitors without a logical size. `DesktopBounds*`: 5/5 pass. The math moved into the new helper, so the test checks the helper itself. The backends' own environment setup needs live DRM/Wayland outputs, which the unit tests can't provide, so there is no test of the old code failing. - Built on Arch Linux (CUDA/nvenc on) from `v2026.1018.5342` with this change, then installed and run on the host above. The table shows real cursor positions read with `hyprctl cursorpos` while a Moonlight-protocol client sent absolute moves, before and after. - `clang-format --dry-run` is clean on the changed files. - Not run: the full unit suite. Some of its tests create virtual input devices and capture the live desktop of the machine I tested on. Not built from `master` itself: the change applies cleanly to it, but I built and tested it on the 1018 release tag. ## Type of Change - [ ] **feat**: New feature (non-breaking change which adds functionality) - [x] **fix**: Bug fix (non-breaking change which fixes an issue) - [ ] **docs**: Documentation only changes - [ ] **style**: Changes that do not affect the meaning of the code (white-space, formatting, missing semicolons, etc.) - [ ] **refactor**: Code change that neither fixes a bug nor adds a feature - [ ] **perf**: Code change that improves performance - [x] **test**: Adding missing tests or correcting existing tests - [ ] **build**: Changes that affect the build system or external dependencies - [ ] **ci**: Changes to CI configuration files and scripts - [ ] **chore**: Other changes that don't modify src or test files - [ ] **revert**: Reverts a previous commit - [ ] **BREAKING CHANGE**: Introduces a breaking change (can be combined with any type above) ## Checklist - [x] Code follows the style guidelines of this project - [x] Code has been self-reviewed - [x] Code has been commented, particularly in hard-to-understand areas - [x] Code docstring/documentation-blocks for new or existing methods/components have been added or updated - [x] Tests have been added or updated for new or modified functionality, including regression tests for bug fixes ### AI Usage See our [AI usage policy](https://docs.lizardbyte.dev/latest/developers/contributing.html#ai-usage). - [x] AI tools were used while preparing this PR Claude Code found the cause by reading Sunshine's and Hyprland's input mapping, wrote the patch and test, and measured the cursor positions above on real hardware. 🤖 Generated with [Claude Code](https://claude.com/claude-code) 79:Ta18,## [![Quality Gate Failed](https://cdn.trylle.com/media/images/36a86a2b4bb65e1c6ebd4953ba995867?key=AbNbDyZ%2Fz9GaK1zg5zmO0bBPClbz6LJgUBh%2FpyifUvCtzWOzrL%2BjBpV6mT27YcfeYl2u%2BqhANmDWrBNTXjcNIZ9N4y%2FW8bra63GeGUxPkQ987BQPs%2BsQwyXScujYyHOPG9hjq5CFUWmwK0atydNHS7jhuciWPHgaS5sufgdgdGdHc2ikCrVantGZzzyDNe2ZNmEs1uniElwxKUk2BzGzgebowHCNdsoL66%2FyKb0g8MwVodZxDjsNtMlFiILXmfF2VhVC3J8%3D "Quality Gate Failed")](https://sonarcloud.io/dashboard?id=LizardByte_Sunshine&pullRequest=5994) **Quality Gate failed** Failed conditions\ ![](https://cdn.trylle.com/media/images/016fbda48b5afd655ca45ff18ec4230b?key=AS0M2EWh%2B6uUbg9mshsmfd0xw1rnxaR3k6XBVvjLyqW1alpQtYj4XdFTb9M6XSNUCHt7%2FCyfhD2dKHpD8JqA01QUFLzCM7p0%2B8GgPjLiDtSxJMz7TYRlypZNpai7XjYrU0LP57Vz4ZNDInQyJif48mtP1XOs25C4PJjCpUcox02N75DH3bDh8QG0%2FQ7bWXZXyC3axTPxmMyIrHcdPwnWRBs3ehwqxrX4PUIkxZrwUxo4 "") [4 New issues](https://sonarcloud.io/project/issues?id=LizardByte_Sunshine&pullRequest=5994&issueStatuses=OPEN,CONFIRMED&sinceLeakPeriod=true)\ ![](https://cdn.trylle.com/media/images/016fbda48b5afd655ca45ff18ec4230b?key=AS0M2EWh%2B6uUbg9mshsmfd0xw1rnxaR3k6XBVvjLyqW1alpQtYj4XdFTb9M6XSNUCHt7%2FCyfhD2dKHpD8JqA01QUFLzCM7p0%2B8GgPjLiDtSxJMz7TYRlypZNpai7XjYrU0LP57Vz4ZNDInQyJif48mtP1XOs25C4PJjCpUcox02N75DH3bDh8QG0%2FQ7bWXZXyC3axTPxmMyIrHcdPwnWRBs3ehwqxrX4PUIkxZrwUxo4 "") [4 New Code Smells](https://sonarcloud.io/project/issues?id=LizardByte_Sunshine&pullRequest=5994&issueStatuses=OPEN,CONFIRMED&sinceLeakPeriod=true) (required ≤ 0) [See analysis details on SonarQube Cloud](https://sonarcloud.io/dashboard?id=LizardByte_Sunshine&pullRequest=5994) ## ![](https://cdn.trylle.com/media/images/b8957fe67ede9297f4e9a2cc11ebc5c4?key=AbRih2taRuU6SilpT3Ku11K1qa49376Y2W53%2FRvkImOMvbLYsFz9KjxthtTNMZJP%2BB89V6wwZlUTlej%2FPjiqrA7%2Bp2a0oRoqqpVwdefYQJCMGVS%2Fkil1BGUWbFHVyRqy8uW7f9unGyeEgwOrCN9fghSHC9es9KPKzOVLBAkKZ7O2Yxsie%2BR9T1%2Bhc64kz6%2FZG64ywKigqqRIBhhCidPOiL68nT6lemcRq8pMPrAemk3bM%2FeohQ%3D%3D "") Catch issues before they fail your Quality Gate with our IDE extension ![](https://cdn.trylle.com/media/images/99d9fc6942e0cbf325d71ea3811211e0?key=ARzG8SLhvzmyfb1qdpMavMHz8MuEv4tHeEIO7j1kYZfeohF2lxoFHxHF07mMlGFTEQjTAoaIRi3ouVCfN8EVGe0wZQ6M1TkXuidm4B4P9k2QzKCCW8LGFVJrztR7JlwRrquX7fs6zjhK%2BJl5mlcfeN%2FD3UfSx5fGoDlZG3woPJdJpcT6ebaScpyimE26FABRnJVUOCpxlPP0HG5eVFGW7MDOT9PwjH6W1KLbnHMMvGi8CzPk "") [SonarQube for IDE](https://www.sonarsource.com/products/sonarlint/features/connected-mode/?referrer=pull-request) 62:["$","$L75",null,{"entries":[{"key":["platform",{"userId":"anon"},"pulls","page",{"owner":"LizardByte","repo":"Sunshine","pullNumber":5994}],"data":{"repositoryId":"3992","detail":{"author":{"avatarUrl":"https://cdn.trylle.com/media/images/2b707a6b0d891b3f74d3ff9984a95da7?key=ATimI0AJCoz3HXosbZ7wvzGlVwdJcGYAan0TkSMW1U5zmBtLkjlKSOBmj%2F8%2BPw82pe9nQM6uDVQVtVAWH%2FBX%2F%2Bw%2BZqmWFPZT1xCFQhWWTr36TXL%2FB7qrIhXd5QnY7XvUEgWdIFjct65wIWzOu5ij%2BK8IN7Ot5Rk%2BOXCxScCqPyj%2FQcgLSWD%2Bqhx0bw%3D%3D","externalProvider":"github","login":"johnafarmer","type":"User","url":"https://github.com/johnafarmer"},"authorId":"12162059","baseRefName":"master","closedAt":null,"comments":2,"createdAt":"2026-10-25T18:56:19Z","headRefName":"johnafarmer/fix/linux-negative-monitor-offsets","id":"4945651","isDraft":false,"labels":[],"number":5994,"repository":{"name":"Sunshine","owner":"LizardByte","provider":"forgejo"},"state":"open","title":"fix(linux): map absolute input across monitors left of or above the origin","updatedAt":"2026-10-25T19:09:28Z","url":"https://trylle.com/LizardByte/Sunshine/pulls/5994","body":"$78","additions":176,"deletions":26,"changedFiles":4,"commits":1,"reviewComments":1,"headSha":"d1c5ee0ce4a6189b4df082cee7a53d0325f368c3","baseSha":"a679b059096bcdd502e2192ce4f6a3c3732fbaae","headRepoOwner":"LizardByte","headRepoName":"Sunshine","isMerged":false,"mergeCommitSha":null,"mergedBy":null,"mergeable":true,"mergeableState":"clean","conflictingFiles":null,"requestedTeams":[],"requestedReviewers":[],"graphqlId":"issue:5994"},"comments":[{"id":26937529,"graphqlId":"26937529","body":"$79","createdAt":"2026-10-25T19:09:28Z","author":{"avatarUrl":"https://cdn.trylle.com/media/images/ffba2eae3878387d344176f3a6e03729?key=ASDUdHAAsxJIAzAhbbYTxbs1BE8boDosy7WO7CO6xXE%2Fxi90ansATxCFdbDT9%2FASXlT6s5z9DHN7VIv965csx7KvK%2FxHWyAwh%2FLfiaj%2BZjXYlqI1smSZf%2FKXF8%2BA8Gg4x9FgZ9IJx3aycXtKcw%2BjBlX4b8sfj%2Fcj6oy6PGJ3EzgTdt5YNoI9FE0b%2Fw%3D%3D","externalProvider":"github","login":"sonarqubecloud[bot]","type":"Bot","url":"https://github.com/apps/sonarqubecloud"}}],"commits":[{"sha":"d1c5ee0ce4a6189b4df082cee7a53d0325f368c3","message":"fix(linux): map absolute input across monitors left of or above the origin\n\nCompositors such as Hyprland map an absolute pointer across the bounding box of every\nmonitor, starting at the leftmost and topmost edges. 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Commits on Sun, Oct 25, 2026