Regular GLError 1280 in LLImageGL::readBackRaw()

[fmartian]

Environment

SecondLife 7.2.2.18475198968 but also in develop HEAD

Second Life Release 7.2.2.18475198968 (64bit)
Release Notes

CPU: 12th Gen Intel(R) Core(TM) i7-12850HX (2419.2 MHz)
Memory: 32453 MB
OS Version: Microsoft Windows 11 64-bit (Build 26100.6899)
Graphics Card Vendor: NVIDIA Corporation
Graphics Card: NVIDIA RTX A2000 8GB Laptop GPU/PCIe/SSE2

Windows Graphics Driver Version: 32.0.15.8092
OpenGL Version: 4.6.0 NVIDIA 580.92

Window size: 1507x1046
Font Size Adjustment: 96pt
UI Scaling: 1
Draw distance: 128m
Bandwidth: 3000kbit/s
LOD factor: 1.25
Render quality: 2
Texture memory: 8192MB
Disk cache: Max size 2150.4 MB (100.0% used)

J2C Decoder Version: KDU v8.4.1
Audio Driver Version: OpenAL, version 1.1 ALSOFT 1.24.2 / OpenAL Community / OpenAL Soft: OpenAL Soft
Dullahan: 1.24.0.202510081738
CEF: 139.0.40+g465474a+chromium-139.0.7258.139
Chromium: 139.0.7258.139
LibVLC Version: 3.0.21
Voice Server Version:

October 17 2025 03:39:26

Description

Looking at my SecondLife.log file I see fairly frequent occurrence of following message:

2025-10-17T11:27:42Z WARNING # llrender/llimagegl.cpp(1861) LLImageGL::readBackRaw : GL Error happens before reading back texture. Error code: 1280

My experience with OpenGL is limited and I have not yet tried to look into what causes this.

I'm pretty sure it was also in the previous release 7.2.1 already but can't remember having seen it in earlier releases.

Reproduction steps

• Run Viewer
• Log in
• Observe the log file for occurrences of that error 1280

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