Windows 10 registry entry setting which fixes PrimSurfSize.cx, PrimSurfSize.cy, and Stride values for a 4K monitor, so windows do not resize after sleep (an issue which seems to affect some Dell computers)

4k-windows-resize-after-sleep-fix.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\GraphicsDrivers\Configuration\NOEDID_8086_3E98_00000000_00020000_31063^9B5CF2A2AB5D52EABA55D3D249C48521]
"SetId"="NOEDID_8086_3E98_00000000_00020000_31063"
"Timestamp"=hex(b):7c,f5,a9,74,7f,f1,d5,01

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\GraphicsDrivers\Configuration\NOEDID_8086_3E98_00000000_00020000_31063^9B5CF2A2AB5D52EABA55D3D249C48521\00]
"PrimSurfSize.cx"=dword:00000f00
"PrimSurfSize.cy"=dword:00000870
"Stride"=dword:00003c00
"PixelFormat"=dword:00000015
"ColorBasis"=dword:00000002
"Position.cx"=dword:00000000
"Position.cy"=dword:00000000
"CcdDbVersion"=dword:00000003

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\GraphicsDrivers\Configuration\NOEDID_8086_3E98_00000000_00020000_31063^9B5CF2A2AB5D52EABA55D3D249C48521\00\00]
"Flags"=dword:00830b8f
"VideoStandard"=dword:000000ff
"ActiveSize.cx"=dword:00000400
"ActiveSize.cy"=dword:00000300
"VSyncFreq.Numerator"=dword:03d239c8
"VSyncFreq.Denominator"=dword:00104dc0
"HSyncFreq.Numerator"=dword:0000ba54
"HSyncFreq.Denominator"=dword:00000001
"PixelRate"=dword:03d239c8
"ScanlineOrdering"=dword:00000001
"Scaling"=dword:00000004
"Rotation"=dword:00000001
"PrimSurfSize.cx"=dword:00000f00
"PrimSurfSize.cy"=dword:00000870
"Stride"=dword:00003c00
"PixelFormat"=dword:00000015
"ColorBasis"=dword:00000002
"DwmClipBox.left"=dword:00000000
"DwmClipBox.top"=dword:00000000
"DwmClipBox.right"=dword:00000400
"DwmClipBox.bottom"=dword:00000300

See this answer for the formula https://superuser.com/a/1334787.

So I think you'd want: ((3440 * 32 + 7) / 8) = 13760 (ignoring the .88)

So hopefully 35c0 in hex for the dword value.