An update has been released for Portal 2.

Improvements:
  - Implemented a Vulkan render backend (currently accessible through the -vulkan command line parameter).
  - Improved compile time for Perpetual Training Initiative puzzles.
  - Improved advanced video settings descriptions.
  - Made the game Hi-DPI aware.
  - Smarter default video settings.
  - Improved resolution of player avatars throughout the game.
  - Players can now be invited to play co-op on controller.
  - Button text contrast and padding has been improved when using a controller.
  - Implemented a 360° Spin action.
  - The portalgun is now correctly affected by dynamic lights (projected textures) in the scene.
  - Improved client-side prediction for coop play.
  - Added the ability for workshop levels to pack particles into their map with a particles/map_manifest.txt
  - Misc. rendering optimizations.
  - Added an icon to the game on Linux.
  - Removed the "Trading Coming Soon" button.
Bug Fixes:
  - Fixed a crash on startup that could happen on Linux.
  - Fixed a crash that could occur in some community test chambers using BEEMod on Linux.
  - Fixed the credits being corrupted on Linux.
  - Fixed the intro videos for acts 2 and 3 not playing on Linux.
  - Fixed the game starting in the top left corner of the screen on Linux.
  - Fixed a crash in the PeTI if you placed a light strip above a laser catcher on the floor and linked it to a fizzler.
  - Fixed the fizzler not playing the retract animation when turned off in new PeTI maps.
  - Fixed being able to copy 'uncopyable' items in the PeTI leading to invalid/broken levels.
  - Fixed some items in PeTI not maintaining their portalability state when expanding the chamber boundaries.
  - Fixed a crash if PeTI avatars could not be retrieved.
  - Fixed Cave Johnson's lines not progressing when playing queued workshop levels.
  - Fixed a memory leak that could occur when changing levels.
  - Fixed a bug where you could no longer ping/taunt via mouse/keyboard if you have ever used a controller.
  - Fixed the ping menu being visible when quick pinging on controller.
  - Fixed the game instructor not respecting input types for respective players in split-screen mode.
  - Fixed rumble not being respected for respective players in split-screen mode.
  - Fixed the wrong avatar being used if playing coop after playing a workshop level.
  - Fixed the OnFiredPortal2 output not firing.
  - Fixed some text being duplicated on the screen multiple times.

An update has been released for Portal 2 Authoring Tools.

- Fixed the Publishing Tool failing to display any workshop item with an ID too large to fit into 32 bits.

An update has been released for Portal 2.

- Fixed issue with recent workshop maps that prevented voting on them or advancing past them in the quick queue.
- Fixed workshop map thumbnails not loading in the community map voting dialog.
- Removed workshop map download limits for subscribed maps introduced in the last update, and increased the limit for the history queue to 500 by default. The history queue size is also now a convar, cm_max_history_chambers, so it can be increased if desired.

An update has been released for Portal 2.

- Fixed controller input bugs in Puzzlemaker.
- Fixed a graphics bug on some DirectX 10 level hardware.
- Updated localization strings.

An update has been released for Portal 2.

- Fixed a potential RCE exploit when processing voice data. Reported via HackerOne.
- Fixed some controller input bugs in authoring tools.
- Updated localization strings.

An update has been released for Portal 2

Windows
- Fixed an issue where in-game audio caption language would use the system language setting instead of the Steam language setting.

Controller support
- Improved camera control through Steam Input – the sensitivity scale has changed so you may need to increase your configuration’s sensitivity.
- Add local coop support for one controller player and one Mouse/Keyboard player.
- Add local coop support from the community coop map queue. Quickplay is still not supported.
- Fix XInput related options being hidden when connecting a Steam Input enabled controller using a Gamepad configuration.
- Fix the challenge mode screen not having enough footer buttons available through Steam Input.
- Fix several more bugs where the incorrect action set could be set in Steam Input.
- Fix several cases where having a controller connected but not active would affect the glyphs and settings screen options.

An update has been released for Portal 2.

- Added support for device specific glyphs from Steam Input API for PlayStation and Switch Pro Controllers.
- Added digital navigation to the community test chamber browser and workshop map voting screens for Steam Input API and XInput controllers.
- Fixed several state transitions where the user could get stuck and require mouse or keyboard to clear it.
- Fixed a case that could leave XInput controllers without control of the camera.
- Fixed a material rendering issue on Linux and OSX.
- Fixed several potential exploits reported via HackerOne.

An update has been released for Portal 2

- Fixed possible remote code execution exploits.
- Fixed potential buffer overflow in closed captions.
Reported via HackerOne.

An update has been released for Portal 2

- Added HUD hint support for Steam Input types other than the Steam Controller.

An update has been released for Portal 2.

- Fixed crashes on multi-core and multi-CPU systems that can allocate more than 32 threads.