The recently on Steam released Hotfix 1.10.1 for Dying Light fixes the Texture-Streaming-Bug on Linux, which were responsible for blurry and/or low resolved textures in the game.
Patch (hotfix) 1.10.1 release notes: * Disabled VAC when playing coop on LAN * Fixed rare issue with infinite loading or crash when starting the game Linux specific: * Fixed textures streaming issue