Bug#874054: Setting QT_LINUX_ACCESSIBILITY_ALWAYS_ON=1 has a huge negative performance impact, should not be always on

[Lisandro Damián Nicanor Pérez Meyer]

Package: at-spi2-core
Version: 2.24.1-2
Severity: important

According to [upstream] setting QT_LINUX_ACCESSIBILITY_ALWAYS_ON=1 has a
huge negative performace impact on Qt, so it should not be enabled by
default. And, if I understand correctly, this is the current behavior.

Upstream suggested that maybe we should try to only set this variable if
the appropriate hardware is found. Do you have any ideas on how we could
achieve this?

[upstream]
<http://lists.qt-project.org/pipermail/development/2017-June/030148.html>

Trying to improve everyone's experience, Lisandro.

-- System Information:
Debian Release: buster/sid
  APT prefers unstable
  APT policy: (990, 'unstable'), (500, 'unstable-debug'), (500, 'buildd-unstable'), (500, 'testing'), (101, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.12.0-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=es_AR.UTF-8, LC_CTYPE=es_AR.UTF-8 (charmap=UTF-8), LANGUAGE=en_US (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Init: systemd (via /run/systemd/system)

Versions of packages at-spi2-core depends on:
ii  libatspi2.0-0  2.24.1-2
ii  libc6          2.24-17
ii  libdbus-1-3    1.11.16+really1.10.22-1
ii  libglib2.0-0   2.53.6-1
ii  libx11-6       2:1.6.4-3
ii  libxtst6       2:1.2.3-1

at-spi2-core recommends no packages.

at-spi2-core suggests no packages.

-- no debconf information