← Back to team overview

documentation-packages team mailing list archive

[Bug 2017573] Re: Font hinting broken on 23.04


@gunnarhj What @mgiammarco is trying to explain is that the RGB subpixel
rendering is also broken. RGB subpixel rendering is a way to make
aliased fonts look even smoother by making use of the physical layout of
the panel pixels. By colouring the aliased pixel, they can be positioned
closer to the stem of the character (at the pixel level) instead of
being an average grey level. So, the blow-ups of RGB subpixel rendered
fonts show a regression in the RGB subpixel rendering.

There is only an extra setting to choose the order of the RGB subpixels,
but a blow-up of RGB subpixel rendered fonts should always result in
coloured aliasing pixels. They are clearly misssing in @mgiammarco and
my screenshots (which was taking from Open Sans as a random example).

@mgiammarco I know my screenshot was not correct, I was giving you the
requested screenshot to confirm the additional regression.

I still feel this is a regression in libfreetype or something near
libfreetype? Although RGB subpixel rendering problem could be caused by
not honouring the setting, since normal aliasing would look grey-scale
like in the screenshots. That would point to fontconfig or fontconfig-

You received this bug notification because you are a member of
Documentation Packages, which is subscribed to fonts-ubuntu in Ubuntu.

  Font hinting broken on 23.04

Status in fonts-ubuntu package in Ubuntu:

Bug description:
  Just upgraded my laptops to Kubuntu 23.04 Lunar Lobster and hinting
  for all non-commercial fonts seems broken. I used to have decent if
  not perfect hinting on Ubuntu and Ubuntu Mono font, but now the only
  fonts that still hint correctly are Microsoft's Verdana and Tahoma
  etc. Not sure whether the devide is exactly along this line, but it
  stands out.

  Tried regenerating font cache (fc-cache -rv) but that didn't help.

  Operating System: Kubuntu 23.04
  KDE Plasma Version: 5.27.4
  KDE Frameworks Version: 5.104.0
  Qt Version: 5.15.8
  Kernel Version: 6.3.0 (64-bit)
  Graphics Platform: Wayland
  Processors: 8 × Intel® Core™ i7-10510U CPU @ 1.80GHz
  Memory: 31.1 GiB of RAM
  Graphics Processor: Mesa Intel® UHD Graphics
  Manufacturer: Notebook
  Product Name: N141CU
  System Version: Not Applicable

To manage notifications about this bug go to: