# Steam Deck client update fixes Vulkan alt-tab hangs and certificate lists

> **Key takeaway:** Valve shipped a stable Steam Client update for Steam Deck that resolves Vulkan games hanging after alt-tab in Desktop Mode and updates certificate revocation lists.

**Published:** 2026-10-21T22:12:40+00:00 
**Source:** Valve Steam Deck Official News 
**Category:** open-gaming 
**Canonical URL:** https://fosswire.org/news/steam-deck-client-update-fixes-vulkan-alt-tab-hangs-and-cert.html 

## Summary
Valve released a Steam Client update to the Stable channel for Steam Deck on October 21st. The update fixes a Desktop Mode bug where Vulkan games would hang after alt-tabbing, updates certificate revocation lists, and corrects a date display error for users in British Columbia.

## What the October Steam Client update changes
- **Desktop Mode**: Fixed Vulkan games hanging after alt-tab, a regression affecting window management in Linux-based desktop sessions
- **Certificates**: Updated certificate revocation lists (CRLs) for Steam's TLS/SSL trust chain
- **Localization**: Fixed date formatting error specific to British Columbia time zone display

## Why it matters
The Vulkan alt-tab fix addresses a practical pain point for Steam Deck users who switch between games and desktop applications, particularly those running games through Proton or native Linux Vulkan paths.