Details
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Bug
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Resolution: Unresolved
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P3: Somewhat important
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None
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6.6.0, 6.6.1
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None
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Linux (Pop!_OS 22.04)
X11 (xorg)
Display running at a high DPI resolution where scaling is needed for a usable experience.
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Linux/X11
Description
I'm using a machine running Linux (Pop!_OS 22.04) with X11 on a HiDPI display (4k, fractional scaling), and this machine is on a KVM.
When I start up any Qt 6 application, the mouse cursor appears at its normal and correctly scaled size.
If I use the KVM to switch to another machine, and then back, the mouse cursor suddenly becomes super-tiny. I've attached screenshots showing this problem in Qt Creator, both before and after switching displays. (I can reproduce this in my own Qt 6 apps as well.)
In the comments to QTBUG-98720, I recently learned that Ilya Fedin is quite familiar with the likely root cause of this issue, and has attempted to submit the following changes to fix it in the past:
https://codereview.qt-project.org/c/qt/qtbase/+/427313
https://codereview.qt-project.org/c/qt/qtbase/+/417817
Attachments
Gerrit Reviews
| For Gerrit Dashboard: QTBUG-124303 | ||||||
|---|---|---|---|---|---|---|
| # | Subject | Branch | Project | Status | CR | V |
| 417817,24 | xcb: monitor RESOURCE_MANAGER for cursor theme change | dev | qt/qtbase | Status: ABANDONED | -1 | +1 |
| 427313,26 | xcb: monitor RESOURCE_MANAGER instead of XSettings for DPI | dev | qt/qtbase | Status: ABANDONED | -1 | 0 |