How to enable anti aliasing on lxqt

[Serkan-devel]

Installing lxqt from the stable debian repositories on a fresh install of debian stretch, there is no anti-alisaing compared to lubuntu

Expected Behavior

A smoother display

Current Behavior

A more blocky display and font

Steps to Reproduce (for bugs)

1. Install debian stretch
2. Install and configure sudo
3. run sudo apt-get install lxqt lxqt-core
   [4. add a /etc/X11/xorg.conf.d/20-intel.conf file containing

Section "Device"
        Identifier    "Intel Graphics"
        Driver        "intel"
        Option        "AccelMethod"        "SNA"
#       Option        "SwapbuffersWait"    "false"
        Option        "TearFree"           "true"
        Option        "DRI3"               "3"
EndSection

, which removed the functionality to set screenbrightness and didn't help anti-aliasing]

Context

I didn't get an answer on niether debian, nor lxde irc on this and I don't know where to report this issue.

System Information

• Distribution & Version:& Kernel: Linux Kachel 4.9.0-4-amd64 compile lxqt-panel, error..., What package should be installed, but sysstat lib is installed. #1 SMP Debian 4.9.51-1 (2017-09-28) x86_64 GNU/Linux
• Qt Version: 5.7.1
• liblxqt Version: N/A
• Package version: 0.11.1

[Vladimir-csp]

See font settings in lxqt-config-appearance.
(or dig into fontconfig in general if you need more tuning)

[Serkan-devel]

Should the DPI be turned higher?

[tsujan]

As @Vladimir-csp said, the option is already there (and checked by default?)

As for the dpi, see this open issue: https://github.com/lxde/lxqt/issues/980. I think it's urgent to fix it as soon as possible.

[Serkan-devel]

So that's why I saw no change

[Serkan-devel]

How can I manually change it?

[tsujan]

Your screenshot shows Firefox, which isn't a Qt app. Those settings won't have any effect on non-Qt apps.

The setting for GTK3 is in ~/.config/gtk-3.0. For GTK2 it's ~/.gtkrc-2.0. LXQt doesn't touch them.

[tsujan]

Closing this because of Firefox, for now. Reopen it if the same thing happens for Qt apps.

[Serkan-devel]

It does [note the sidebar]

[Serkan-devel]

I can't reopen

[Vladimir-csp]

Your screenshot shows Firefox, which isn't a Qt app. Those settings won't have any effect on non-Qt apps.

That is not entirely true. lxqt-config-appearance writes to fontconfig configuration, therefore if font-related lines are not present in GTK configs, GTK will fall back to fontconfig.

Should the DPI be turned higher?

So, do you need to tweak AA or DPI? AA is already enabled judging by your screenshots.

[tsujan]

Reopening because of my probable mistake (as @Vladimir-csp said).

However, I think Firefox's page font can't be set outside Firefox. I'm not sure about Krita either.

[tsujan]

@Vladimir-csp I don't think gtk font can be changed by LXQt font settings. Changing the font didn't have any effect on gnome-system-monitor, for example, although there's no font line in my GTK settings.

[Serkan-devel]

Can a font change take affect in chromium?

[Vladimir-csp]

Firefox still takes font rendering settings the same way as GTK apps: from GTK configuration, with fallback to fontconfig.

I don't think gtk font can be changed by LXQt font settings.

Font - no, but font rendering settings can be.

To change font itself in GTK apps, install lxappearance.

But then again, since on screenshots AA is already enabled, what is the problem anyway?
Perhaps an issue is in hinting: either in weight or whether font's built-in instructions are used, or fontconfigs' autohint (and this depends on font itself). Also, in recent versions Fontconfig changed it's autohint behavior and dropped supoprt for built-in hinting instructions.

[Serkan-devel]

AA is enabled but doesn't work

[tsujan]

Font - no, but font rendering settings can be.

OK. I was on the verge of confusion ;)

[Vladimir-csp]

AA is enabled but doesn't work

Your screenshots say otherwise:

What result are you trying to achieve?

[Serkan-devel]

Ok I compared it with screenshots on the lubuntu installation and qt is the same here.

[Serkan-devel]

I just lost all panels when changing the sub-pixel geometry in lxappearance

[Serkan-devel]

What sould be changed there? Kantenglättung (anti-aliasing) is enabled there