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CAD tip CAD tip # 12103:

Question CAD 
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Q - question

Random lines are displayed over my AutoCAD drawing.

A - answer When I open an older DWG drawing in AutoCAD 2015, 2016, 2017, 2018, 2019, 2020 or 2021, crazy random unwanted white or colored lines (vectors) are drawn over the drawing - these lines cannot be selected or erased. This problem - a compatibility issue - may appear on some types of AMD graphics cards, typically on AMD ATI Radeon HD 3400, AMD ATI FirePro 2260, AMD ATI FirePro V3700, AMD ATI Radeon HD 4200, AMD ATI Radeon HD 4250, on some types of NVIDIA cards, typically on NVIDIA Quadro M2200, NVIDIA Quadro MX150, NVIDIA Quadro K4200 and on some types of INTEL cards, Intel HD Graphics Pro 520 (on Surface Pro 4) and Intel UHD Graphics 620.

additional surplus lines

random geometry

In the dialog Graphics performance (GRAPHICSCONFIG), disable the option Smooth Line Display (the Details button). Or switch it off by setting the system variable LINESMOOTHING (set to 0). In AutoCAD 2016 and higher, you will need first to disable high quality geometry (the dialog Graphics performance or the system variable HQGEOM), only then you can deactivate line smoothing. AutoCAD for Mac 2015 does not expose the LINESMOOTHING variable so you cannot apply this solution there. In DWG TrueView, use the status bar button to invoke graphics configuration.

Disabling hardware acceleration will also solve it.

100% *  CAD 
6.1.2019    25204×  
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applies to: AutoCAD · AutoCAD LT · DWG ·

See also:
Tip 12951:How to disable DirectX 12 in AutoCAD 2022/2023/2024?
Tip 12049:AutoCAD display (status bar) jumps and flickers while zooming.
Tip 11679:How to hide or display ViewCube in Fusion 360?
Tip 10986:FATAL ERROR: Unhandled Access when displaying a layout with rendered view
Tip 10871:FEM - graphical representation of simulation results in missing.

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