Some users may need specific support because of e.g. some visual impairment. USB braille displays are detected automatically (not serial displays connected via a serial-to-USB converter), but most other accessibility features have to be enabled manually. Some boot parameters can be appended to enable accessibility features. Note that on most architectures the boot loader interprets your keyboard as a QWERTY keyboard.
Punktskriftsskärmar för USB ska identifieras automatiskt. En textversion av installationsprogrammet kommer sedan att väljas automatiskt och stöd för punktskriftsskärmen kommer att installeras automatiskt på målsystemet. Du kan därför bara trycka på Enter vid uppstartsmenyn. När brltty
har startats så kan du välja en punktskriftstabell genom att gå in i inställningsmenyn. Dokumentation för tangentbindingar för punktskriftsskärmar finns tillgänglig på webbsidan för brltty
.
Serial braille displays cannot safely be automatically detected (since that may damage some of them). You thus need to append the brltty=
boot parameter to tell driver
,port
,table
brltty
which driver it should use. driver
should be replaced by the two-letter driver code for your terminal (see the BRLTTY manual). port
should be replaced by the name of the serial port the display is connected to, ttyS0
is the default, ttyUSB0
can be typically used when using a serial-to-USB converter. table
is the name of the braille table to be used (see the BRLTTY manual); the English table is the default. Note that the table can be changed later by entering the preference menu. Documentation on key bindings for braille devices is available on the brltty
website.
Some accessibility devices are actual boards that are plugged inside the machine and that read text directly from the video memory. To get them to work framebuffer support must be disabled by using the fb=false
boot parameter. This will however reduce the number of available languages.
For users with low vision, the installer can use a high-contrast color theme that makes it more readable. To enable it, append the theme=dark
boot parameter.
Alternatively, Debian can be installed completely automatically by using preseeding. This is documented in Appendix B, Automatiserad installation med förinställningar.
Documentation on accessibility of the installed system is available on the Debian Accessibility wiki page.