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Bug Report: ScreenBufferSize is limited to 32766 #4074

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opened 2026-01-30 23:37:20 +00:00 by claunia · 1 comment
claunia commented 2026-01-30 23:37:20 +00:00
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Originally created by @sureshkotapydev on GitHub (Sep 26, 2019).

Environment

Windows Server 2016 Standard Evaluation

Windows build number: Microsoft Windows [Version 10.0.14393]
Windows Terminal version (if applicable):

Any other software?

Steps to reproduce

mode con:Lines=32767

Expected behavior

Should set Lines/ScreenBufferSize to 32767

Actual behavior

The screen cannot be set to the number of lines and columns specified.

Originally created by @sureshkotapydev on GitHub (Sep 26, 2019). <!-- 🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨 I ACKNOWLEDGE THE FOLLOWING BEFORE PROCEEDING: 1. If I delete this entire template and go my own path, the core team may close my issue without further explanation or engagement. 2. If I list multiple bugs/concerns in this one issue, the core team may close my issue without further explanation or engagement. 3. If I write an issue that has many duplicates, the core team may close my issue without further explanation or engagement (and without necessarily spending time to find the exact duplicate ID number). 4. If I leave the title incomplete when filing the issue, the core team may close my issue without further explanation or engagement. 5. If I file something completely blank in the body, the core team may close my issue without further explanation or engagement. All good? Then proceed! --> <!-- This bug tracker is monitored by Windows Terminal development team and other technical folks. **Important: When reporting BSODs or security issues, DO NOT attach memory dumps, logs, or traces to Github issues**. Instead, send dumps/traces to secure@microsoft.com, referencing this GitHub issue. If this is an application crash, please also provide a Feedback Hub submission link so we can find your diagnostic data on the backend. Use the category "Apps > Windows Terminal (Preview)" and choose "Share My Feedback" after submission to get the link. Please use this form and describe your issue, concisely but precisely, with as much detail as possible. --> # Environment Windows Server 2016 Standard Evaluation ```none Windows build number: Microsoft Windows [Version 10.0.14393] Windows Terminal version (if applicable): Any other software? ``` # Steps to reproduce <!-- A description of how to trigger this bug. --> mode con:Lines=32767 # Expected behavior Should set Lines/ScreenBufferSize to 32767 <!-- A description of what you're expecting, possibly containing screenshots or reference material. --> # Actual behavior The screen cannot be set to the number of lines and columns specified. <!-- What's actually happening? -->
claunia added the Product-ConhostResolution-By-DesignNeeds-TriageNeeds-Tag-Fix labels 2026-01-30 23:37:20 +00:00
claunia commented 2026-01-30 23:37:21 +00:00
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@zadjii-msft commented on GitHub (Sep 26, 2019):

That's a pretty fundamental part of conhost unfortunately. The Console API unfortunately only accepts sizes as SHORTs, so we can't resize to anything larger than that, nor can any program tell us to resize to something larger than that. This behavior probably dates back to the earliest versions of Windows.

Changing the console API to accept a larger integer type is also not about to happen. That would be a pretty substantial breaking change, and we're not really investing in the legacy Console API anymore.

@zadjii-msft commented on GitHub (Sep 26, 2019): That's a pretty fundamental part of conhost unfortunately. The Console API unfortunately only accepts sizes as `SHORT`s, so we can't resize to anything larger than that, nor can any program tell us to resize to something larger than that. This behavior probably dates back to the _earliest_ versions of Windows. Changing the console API to accept a larger integer type is also not about to happen. That would be a pretty substantial breaking change, and we're not really investing in the legacy Console API anymore.
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Reference: starred/terminal#4074
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