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Issues for the Linux port of Portal 2

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After some point (approx 18 October 2022), Portal 2 on Linux began to display the game strangely. Pictures/backgrounds are ok, but interactive elements (menu, game itself) seem to be flattened/compressed....

**Update:** This issue was analyzed. At the bottom of this post you will find more detail that points very close to the exact cause, maybe even the exact cause.  ...

not linux specific

When the player is using a controller, the `game_ui` entity won't fire outputs for when the player presses left/right, only forward/backward. This entity is commonly used by mappers to detect...

On map mp_coop_tbeam_end (last map on course 4) the funnel should clip through the hole in the wall, but instead it is blocked by the wallframes. Making it impossible to...

not linux specific

Happens on the Co-op customization screen/inventory. After the click, it brings up the "loading the store" menu, then it freezes and crashes. I use the latest build of the game....

The local splitscreen mode for community co-op maps that was added in one of the recent updates has a number of bugs (at least on Windows, but I don't see...

not linux specific

On first startup, the game worked fine, but when I opened the controller settings to change the configuration, the game froze. (but still opened the Steam Input menu) After forcing...

In the console versions of Portal 2, the co-op pause menu has some changes made while playing in splitscreen: the "your partner in science" card is removed, and the exit...

![image](https://user-images.githubusercontent.com/92986867/225478179-00534137-c3ad-472c-880c-52e4b2e241e5.png) If you set `net_usesocketsforloopback` to 1 and then try to load any map, games would never load since the server never seems to expose the port This issue is...

To reproduce: * Steam beta 1672959571 (2023-01-05 19:23:52) * Steam Runtime 0.20221019.0 * Not currently using Steam Linux Runtime compatibility tool (but I have also reproduced this with SLR) *...