https://bugs.kde.org/show_bug.cgi?id=504467
Bug ID: 504467
Summary: Provided by feedback screen information seems
incorrect
Classification: Frameworks and Libraries
Product: frameworks-kuserfeedback
Version First unspecified
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Telemetry Provider
Assignee: vkra...@kde.org
Reporter: w01dn...@gmail.com
Target Milestone: ---
SUMMARY
I was checking user feedback data that was sent and noticed screen information
is not quite correct.
Sent telemetry states following, note that both screen marked with
devicePixelRatio = 2 and dpi is strange:
```
"screens": {
"data": [
{
"devicePixelRatio": 2,
"dpi": 94,
"height": 800,
"width": 1280
},
{
"devicePixelRatio": 2,
"dpi": 99,
"height": 1152,
"width": 2048
}
],
"description": "Розмір і роздільна здатність усіх з’єднаних із
комп’ютером дисплеїв.",
"telemetryMode": "DetailedSystemInformation"
},
```
While `kscreen-doctor -o | grep -E 'Output|Geometry|Scale'` provides correct
information:
```
Output: 1 eDP-1
Geometry: 384,1152 1280x800
Scale: 2
Output: 2 DP-3
Geometry: 0,0 2048x1152
Scale: 1.25
```
Unfortunately it doesn't say anything about DPI, checked another:
```
$ kscreen-console outputs | grep -E '(Name|Size|Scale):'
maxSize: QSize(64000, 64000)
minSize: QSize(0, 0)
currentSize: QSize(2048, 1952)
Name: "eDP-1"
MMSize: QSize(345, 215)
Size: QSize(2560, 1600)
Scale: 2
Name: ""
Name: "DP-3"
MMSize: QSize(527, 296)
Size: QSize(2560, 1440)
Scale: 1.25
Name: "PHL 245E1"
```
So 94 = round(2560/345*25.4/2)
99 = round(2560/527*25.4/1.25)
where
2560 — physical size of a screen (both),
345 & 527 — size in mm
25.4 — mm per inch
2 & 1.25 — real scale set for screen.
STEPS TO REPRODUCE
1. Setup two screens, one with fractional scaling 1.25, other with scaling 2.
2. Check sent kuserfeedback data.
OBSERVED RESULT
EXPECTED RESULT
SOFTWARE/OS VERSIONS
Windows:
macOS:
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma:
KDE Plasma Version:
KDE Frameworks Version:
Qt Version:
ADDITIONAL INFORMATION
devicePixelRatio is set to 2 for both screens, which is misleading. Also DPI is
recalculated relative to real scaling (unsure if that's intentional).
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