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Ticket Resolution Summary Owner Reporter
#20610 duplicate Poor performance on 4k display with scale factor less than 200% VB_User
Description

I'm experiencing problems with VirtualBox 6.1.26 (tried other versions as well, very end of 5 series, and end of 6.0) and 4k external display. My laptop is Lenovo P53 with i7-9850H and Nvidia T2000 graphics card. 4k display needs scaling and when it's set 200% (effective resolution Full HD) then everything is smooth. If I go lower than 200% the screen gets choppy - even when dragging the explorer window very slow refresh rate is noticeable. When I change to 100% for the scale factor everything is very smooth again. My goal is to use 150% scaling and that will give me QHD resolution - but it's impossible to use due to lag.

I tried all possible options. Adding more CPUs or enabling 3D acceleration doesn't make any difference. Changing the scale factor from 200% to 199% like with flick of switch affects performance.

I can't believe that this powerful laptop can't handle a 4k display with scaling. Something is not right here.

Host: Windows 10 Guest: Windows 7

#20601 duplicate UI not working when Win10 User resize scale. MorrisTW
Description

Hi there,

When I need to import / export or create New VM, need UI window to complete.

BUT it is not working when User set win10 windows scale in 150% (not 100%)

Workaround is set windows = 100%, then adjust to 150% after completed.

PLEASE HELP let it can support WIN10 WINDOWS SCALE. thx

#20596 worksforme unaligned (x86_64 = 2MB) kernel crash the guest in nested mode nplanel
Description

VirtualBox Version 6.1.26 r145957 (Qt5.6.3) Host : MacOS Guest : Linux ManjaroMacBook 5.10.68-1-MANJARO #1 SMP PREEMPT Wed Sep 22 12:29:47 UTC 2021 x86_64 GNU/Linux

If you build a linus kernel < 4.4.124 (IIRC) kernel build script don't align the ELF to 2MB on x86_64 and make the guest crash, may due a triple page fault.

This as been addressed in linux kernel tree commit : e3d03598e8ae7d195af5d3d049596dec336f569f

testing command inside the guest # qemu-system-x86_64 -kernel linux-4.4

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