Opened 5 years ago
Last modified 4 years ago
#19082 new defect
VirtualBox Manager scaled *down*, when a mix of HiDPI and non-HiDPI screens are attached
| Reported by: | Nuvanda | Owned by: | |
|---|---|---|---|
| Component: | VMM | Version: | VirtualBox 6.0.14 |
| Keywords: | HiDPI Qt | Cc: | |
| Guest type: | all | Host type: | Linux |
Description
Steps to reproduce:
- Set up a machine with a mix of HiDPI and non-HiDPI screens
- Start virtualbox
- Observe failure
Expected result: The GUI of virtualbox looks normal Also acceptable: The GUI is scaled up for the HiDPI screen
Observed behavior: The GUI of virtualbox is scaled *down* by roughly a factor of two. Making the text hard to read even on a low-resolution screen. The virtual machines themselves are not impacted.
My setup: VirtualBox Version is 6.0.14 r133895 (Qt5.6.1) on Debian 10 Buster. The device is a Lenovo T490 notebook, with an internal 14" 1920x1080 (HiDPI) screen. The behavior is observed when attaching a low-res 1920*1200 external display, but not when attaching a HiDPI 3840*2160 display. The behavior occurs both with the Debian-Package, and with the distribution-agnostic installation. I am not aware of any custom configuration on my system that might impact this.
Additional notes: I have posted about this on the forums here: https://forums.virtualbox.org/viewtopic.php?f=7&t=95297. There are descriptions of similar behavior (may or may not be the same issue) here: https://forums.virtualbox.org/viewtopic.php?f=7&t=92965; and here: https://forums.virtualbox.org/viewtopic.php?f=7&t=88116. All of these are recent. I first observed this behavior after installing an update using apt, however I do not know which version I had before that, sorry.
Temporary workaround: Virtualbox can be forcibly scaled up by setting QT_SCALE_FACTOR=2, however this cannot be set globally, as it will break all other Qt-based applications. Also when this bug is not triggered (b/c only low-res or HiDPI screens are attached) the extra scaling will make everything unusably big.
Is there any log files that I should post to help reproduce this?
Change History (3)
comment:1 by , 5 years ago
comment:2 by , 5 years ago
Related discussion in the forums: https://forums.virtualbox.org/viewtopic.php?f=7&t=95297
comment:3 by , 4 years ago
Another related discussion: https://forums.virtualbox.org/viewtopic.php?f=7&t=88116
The issue is similar and adding the following line to the ~/.bashrc file worked on my machine.
export QT_AUTO_SCREEN_SCALE_FACTOR=0
Not sure if this helps, but the scaling down affects only the contents of the windows. The windows themselves are still created with the correct geometry. So the about box – for Example – will still have the same size it normally has, but it is now mostly empty, because the image and the text are tiny.