[Windows 11: 24H2 specific bug] Steam fails to launch.

[Elucidator]

Referring: https://steamcommunity.com/discussions/forum/1/4333106230734794460/

Issue:
SteamWebhelper fails to launch, this prevents steam from launching.

Details:
The community narrowed down the cause of the issue as follows:
-> This bug only happens on systems with Windows 11, updated to 24H2. Reverting back to 23H2 resolves the issue.
-> This bug pretends that the cause is the ati driver dll: atio6axx.dll
-> The Steam error logs show several entries related to the GPU.
-> It only seems to affect people with an AMD graphics card and using it as main output; not sure which exactly.

Steps:
-> Have a system with and AMD graphics card and Windows 11 installed, updated to the latest 24H2 update (which is still in preview stages, according to microsoft).
A clean install of this system is all that is needed.
-> Install Steam.
-> Attempt to launch the Steam Client.

Result:
Steam fails to launch and seems to just close.

Expected:
Steam launching succesfully. The Steam Store page to be displayed in the steam client's main window, etc.

I recommend reading the thread, despite it may be taking some time.
Also: information on the currently optional Window 11 24H2 update.
https://blogs.windows.com/windows-insider/2024/05/22/releasing-windows-11-version-24h2-to-the-release-preview-channel/

[Elucidator]

List of threads showing up with people facing this issue:
[6/16th] https://steamcommunity.com/discussions/forum/1/6725643788916599657/
[6/22nd] https://steamcommunity.com/discussions/forum/1/6516193260169315933/?ctp=5#c4343240135702327644
[6/23rd] https://steamcommunity.com/discussions/forum/1/4343240316588361802/
[6/25th] https://steamcommunity.com/discussions/forum/1/4343240316593320134/
[6/25th] https://steamcommunity.com/discussions/forum/1/4343240481092966558/

(there are probably more and yeah, because Windows is pushing this beta update more and more, more people will be affected in the near future.)

[bidulless]

Originally posted by Elucidator:

List of threads showing up with people facing this issue:
[6/16th] https://steamcommunity.com/discussions/forum/1/6725643788916599657/
[6/22nd] https://steamcommunity.com/discussions/forum/1/6516193260169315933/?ctp=5#c4343240135702327644
[6/23rd] https://steamcommunity.com/discussions/forum/1/4343240316588361802/
[6/25th] https://steamcommunity.com/discussions/forum/1/4343240316593320134/
[6/25th] https://steamcommunity.com/discussions/forum/1/4343240481092966558/

(there are probably more and yeah, because Windows is pushing this beta update more and more, more people will be affected in the near future.)

hello
This is the problem with a permanant beta os ...

[[REDACTED]]

Can confirm it’s Nvidia as well, 4090. Reverting to 23H2 fixes it, updating back to 24H2 means the issue returns.

More info:
Occurs across 551.86, 555.99, 560.38 drivers, the first being WDDM 3.1 the other two WDDM 3.2. Occurs with and without the iGPU enabled in BIOS, setting all steam processes to prefer the iGPU makes no difference. Tried all sorts of cache clears, network resets (netsock, etc). Tried exempting Steams folder from Defender (no other AV/cleaning software), tried launching as admin in different forms, tried disabling the new Auto Color Management. Tried all sorts of launch arguments like disabling GPU acceleration, the sandbox, single process, etc etc. i9 13900k, 4090, newest BIOS for both, nothing disabled in BIOS.

[KyuKyu]

netsh int tcp set supplemental internet congestionprovider=ctcp in powershell through admin helped me! Seems like BBR2 is broken

[TrippiTroppa TroppaTrippi]

Originally posted by KyuKyu:

netsh int tcp set supplemental internet congestionprovider=ctcp in powershell through admin helped me! Seems like BBR2 is broken

This worked wonders. Done this and it immediately started working. tyty

[Va1halla]

Originally posted by KyuKyu:

netsh int tcp set supplemental internet congestionprovider=ctcp in powershell through admin helped me! Seems like BBR2 is broken

Thanks a lot, worked🥹

[MicroDoge]

Originally posted by KyuKyu:

netsh int tcp set supplemental internet congestionprovider=ctcp in powershell through admin helped me! Seems like BBR2 is broken

Thank you very much! This is still not fixed on day 24H2 released.

[xynx]

Originally posted by KyuKyu:

netsh int tcp set supplemental internet congestionprovider=ctcp in powershell through admin helped me! Seems like BBR2 is broken

thank you so much!! i was about to go nuts over this

[BottlenekDolfin]

Originally posted by KyuKyu:

netsh int tcp set supplemental internet congestionprovider=ctcp in powershell through admin helped me! Seems like BBR2 is broken

Are YOU SERIOUS!?

Thought I was being clever using BBR2 and that it wouldn't hurt anything. How is it THAT that's broken.

[NotSoLuvly on twitch]

Originally posted by KyuKyu:

netsh int tcp set supplemental internet congestionprovider=ctcp in powershell through admin helped me! Seems like BBR2 is broken

LITERALLY GOD BLESS YOU OML

[科比·布莱恩特]

Originally posted by KyuKyu:

netsh int tcp set supplemental internet congestionprovider=ctcp in powershell through admin helped me! Seems like BBR2 is broken

thx it works

[VirtualBS]

Originally posted by KyuKyu:

netsh int tcp set supplemental internet congestionprovider=ctcp in powershell through admin helped me! Seems like BBR2 is broken

Thank you! BBR2 is still broken in W11 24H2 as of today. Steam refuses to start, sometimes showing an error in the Steam Client WebHelper (steamwebhelper.exe).

[·•●★*´]

KyuKyu a écrit :
netsh int tcp set supplemental internet congestionprovider=ctcp in powershell through admin helped me! Seems like BBR2 is broken

Many Thanks it's all Good it's is solved - 🙏

[Dudu]

Originally posted by KyuKyu:

netsh int tcp set supplemental internet congestionprovider=ctcp in powershell through admin helped me! Seems like BBR2 is broken

works 100% Thx bro u awesome!

[Mr. Chedda]

It amazes me how this stuff passes quality control (probably doesn't). Thanks! Works wonders.