Comment # 57 on bug 1199020 from Fabian Vogt

(In reply to Stefan Hundhammer from comment #55)
> Now for the font sizes.
> 
> Analyzing the first set of y2logs from comment #2 (jsudermann):
> 
> 
> Xorg.0.log:
> 
> [ 82.995] (II) modeset(0): clock: 152.8 MHz
>           Image Size: 344 x 193 mm
> 
> [ 82.995] (II) modeset(0): h_active: 1920 h_sync: 2000
>           h_sync_end 2054 h_blank_end 2250 h_border: 0
> 
> [ 82.995] (II) modeset(0): v_active: 1080 v_sync: 1086
>           v_sync_end 1094 v_blanking: 1132 v_border: 0
> 
> 
> y2start.log:
> 
> Stage [call]: Monitor size: eDP-1 connected primary 1920x1080+0+0
>               (normal left inverted right x axis y axis) 344mm x 193mm
> 
> Stage [call]: Monitor width mm: 344
> Stage [call]: Monitor width px: 1920
> Stage [call]: Monitor dpi: 144
> Stage [call]: Xft.dpi set to: 144
> 
> 
> y2log:
> 
> 
> 2022-04-29 14:43:46 <1> install(4700) [qt-ui]
> 
> YQApplication.cc(pickAutoFonts):471 Selecting auto fonts -
>   normal: 10, heading: 12 (bold)
> 
> YQApplication.cc(currentFont):339 Loaded 10 pixel font:
>   Sans Serif,-1,10,5,50,0,0,0,0,0
> 
> 
> This sounds very reasonable so far. Except for this:
> 
> 
> YQUI.cc(calcDefaultSize):370 -fullscreen: using 960 x 540
>   for `opt(`defaultsize)
> 
> YQUI.cc(calcDefaultSize):404 Default size: 960 x 540
> 
> 
> ?!? Why does it use 960 x 540 for -fullscreen?
> 
> https://github.com/libyui/libyui/blob/master/libyui-qt/src/YQUI.cc#L370
> 
>   QSize availableSize = screen->availableSize();
> 
> So Qt thinks we are in HiDPI mode, scaling everything? 

Yes, QScreen::availableSize returns "device-independent pixels", so physical
pixels / scale factor.

> It's using half the resolution values of 1920 x 1080 in both dimensions.

Which sounds wrong. With 1080 horizontal pixels HiDPI scaling should not be
enabled,
or at most use 1.5x scaling.

> And we also requested only a moderate font size: 10 px for normal text, 12
> px for headings. Yet the screenshots show that those are massively scaled
> up; probably to 20 px for normal text (I can only guess).