There are some computers and configurations I manage which rely on some
of these drivers:

evdev: there are some netbooks which have touchscreens that only work
with evdev, being detected by libinput but doing nothing. While this is
a libinput limitation, removing evdev would limit the netbooks'
capabilities: the touchscreen can be greatly beneficial, especially when
used with programs which can be centered on this type of interactivity
(ArduBlock is one example).

siliconmotion: some years ago, thousands of computers were bought with
PCI GPUs that use siliconmotion graphics. While some of these old
computers are unusable today, the GPUs aren't and can be installed and
used on new computers. These new computers have specifications good
enough to allow up to 5 seats for a single computer, greatly reducing
costs associated with keeping a laboratory, both by reduced initial
investment and reduced power usage.

I am worried: abandoning evdev would make some touchscreens stop
working, as libinput does not support those properly. Abandoning
siliconmotion would make certain multiseat configurations stop working,
making, for example, one laboratories with 8 computers for 22 seats
require buying additional 14 computers to replace what is going to stop

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  Remove obsolete X11 drivers from the archive

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