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19 lines
816 B
Plaintext
19 lines
816 B
Plaintext
# $Id: 91-retro-usb-latency.rules 1194 2019-07-20 07:43:21Z mueller $
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# SPDX-License-Identifier: GPL-3.0-or-later
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# Copyright 2017- by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
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#
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# udev rules to set FTDI USB-serial adaptors to low latency mode
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#
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# copy into /etc/udev/rules.d
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#
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# Notes:
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# - prior to linux 2.6.32 the default was the built in 16 ms device latency
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# - from linux 2.6.32 till 4.4 patch 9589541 low latency (1 ms) was the default
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# - the patch https://patchwork.kernel.org/patch/9589541/ reverted this
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# - the entered the 4.4.52 and higher kernel lines under the changelog heading
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# USB: serial: ftdi_sio: fix extreme low-latency setting
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# - this rule ensures that low (1ms) latency is used
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#
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ACTION=="add", SUBSYSTEM=="tty", DRIVERS=="ftdi_sio", RUN+="/bin/setserial /dev/$kernel low_latency"
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#
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