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Initial commit: rtw89-steam-frame DKMS wrapper

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DKMS package that fetches the in-tree rtw89 source for the target kernel,
applies the steam-frame patches, and builds/installs the patched RTL8852CU
modules for the Valve Steam Frame wireless adapter.

- dkms.conf: module list + install locations
- build.sh: fetch (gregkh/linux) + patch + build + verify
- register.sh: clone upstream patches, stage into /usr/src, dkms add/build/install

GPL-2.0-only.
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erik
2026-10-09 17:43:34 +02:00
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README.md
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<!-- SPDX-License-Identifier: GPL-2.0-only -->
# rtw89-steam-frame dkms
DKMS wrapper for the patched Realtek rtw89 driver used by the **Valve Steam Frame**
wireless adapter (`28de:2432`, RTL8852CU).
It builds the *in-tree* rtw89 source for whatever kernel you run (fetched from
`gregkh/linux`), applies the **steam-frame patches** (pulled at register time via git
from [Davenport-Physics/rtw89-steam-frame](https://github.com/Davenport-Physics/rtw89-steam-frame)),
and auto-rebuilds on every kernel upgrade through the Arch DKMS pacman hooks.
## Why
The Frame advertises a 6 GHz **VLP** power class and the stock driver honors it,
capping the dongle at 7/4 dBm (1TX/2TX) — roughly 10 dB below what the Windows driver
uses. That deficit caused MAC-layer retry storms and bursty micro-stutters in VR
streaming (see [SteamVR-for-Linux#965](https://github.com/ValveSoftware/SteamVR-for-Linux/issues/965)).
`reg6_pwr_override=1` switches the adapter to the **LPI** table (12/11 dBm at 160 MHz),
which on this system removed the missed-frame stalls even at ~1.8x the previous load.
`disable_2ghz=Y` additionally disables the useless 2.4 GHz band (and the scan-offload
USB resets associated with it).
## Install / re-register
./register.sh # As root
This clones upstream, stages `/usr/src/rtw89-steam-frame-0.1`, and runs
`dkms add/build/install` for the current kernel. After that, the Arch pacman hooks
(`/usr/share/libalpm/hooks/70-dkms-*`) rebuild it automatically on every kernel update.
Optional env overrides: `RTW89_UPSTREAM`, `RTW89_UPSTREAM_REF`, `RTW89_KVER`.
## Preconditions
- `linux-headers` installed and kept in sync with `linux`.
- Network access at (re)build time — the kernel's rtw89 source and the patches are
both fetched over HTTPS.
## Files
| file | purpose |
|---------------|---------|
| `dkms.conf` | DKMS metadata (module list, install location) |
| `build.sh` | DKMS build step: fetch rtw89 for `$kernelver`, patch, build, verify |
| `register.sh` | pull upstream patches via git, stage, `dkms add/build/install` |
## Module parameters
Add this to `modprobe.d`, e.g. `/etc/modprobe.d/rtw89-steam-frame.conf`:
`options rtw89_core reg6_pwr_override=1 disable_2ghz=Y`
You might also want to disable advanced power management if not done so already
(also supported by in-kernel driver):
`options rtw89_core disable_ps_mode=Y`
build.sh
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#!/usr/bin/env bash
# SPDX-License-Identifier: GPL-2.0-only
#
# rtw89-steam-frame DKMS build step.
#
# Fetches the in-tree rtw89 source for the *target* kernel from gregkh/linux,
# applies the steam-frame patches, and builds in the current directory.
#
# Invoked by DKMS: CWD = DKMS build dir, $kernelver exported by DKMS.
# Also runnable standalone: kernelver=7.2.8-arch1-2 bash build.sh
#
# Exit non-zero on any failure so DKMS marks the build failed (module not
# installed for that kernel -> kernel keeps its stock rtw89). See plan for
# the modprobe.d recovery note.
set -euo pipefail
KVER="${kernelver:-${1:-}}"
[ -n "$KVER" ] || { echo "ERROR: kernelver not set (DKMS exports it; else pass as \$1)"; exit 1; }
BASE="${KVER%%-*}"
TAG="v${BASE%.0}"
HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
BUILD="${PWD}"
KBUILD="/lib/modules/$KVER/build"
API="https://api.github.com/repos/gregkh/linux/contents/drivers/net/wireless/realtek/rtw89?ref=$TAG"
MODS="rtw89_8852cu rtw89_usb rtw89_8852c rtw89_core"
echo "== rtw89-steam-frame DKMS build: kernel=$KVER tag=$TAG =="
[ -d "$KBUILD" ] || { echo "ERROR: kernel headers missing at $KBUILD (install linux-headers-$KVER)"; exit 1; }
# clear any previous fetch leftovers
find "$BUILD" -maxdepth 1 -type f \( -name '*.c' -o -name '*.h' -o -name 'Kconfig' -o -name 'Makefile' -o -name '*.files' \) -delete 2>/dev/null || true
echo "-- fetch rtw89 source for $TAG (gregkh/linux)"
curl -sf "$API" | python3 -c '
import json, sys
for f in json.load(sys.stdin):
if f["type"] == "file":
print(f["name"], f["download_url"])' > "$BUILD/rtw89.files"
n=$(wc -l < "$BUILD/rtw89.files")
[ "$n" -gt 0 ] || { echo "ERROR: no source files for $TAG (network? tag missing?)"; exit 1; }
(cd "$BUILD" && xargs -P 8 -n 2 sh -c 'curl -sf -o "$0" "$1"' < rtw89.files) \
|| { echo "ERROR: source download failed"; exit 1; }
[ "$(ls "$BUILD"/*.c "$BUILD"/*.h 2>/dev/null | wc -l)" -gt 0 ] || { echo "ERROR: download incomplete"; exit 1; }
echo "-- apply patches"
for p in "$HERE"/patches/*.patch; do
if ! (cd "$BUILD" && patch -p1 --no-backup-if-mismatch -s < "$p"); then
echo "ERROR: $(basename "$p") does not apply to $TAG"
echo " -> module NOT built for $KVER; kernel stock rtw89 will be used."
echo " -> RECOVERY: remove /etc/modprobe.d/rtw89-steam-frame.conf before reloading WiFi"
exit 1
fi
echo " applied $(basename "$p")"
done
echo "-- build against $KVER headers"
make -s -j"$(nproc)" -C "$KBUILD" M="$BUILD" modules 2>&1 \
| grep -vE 'BTF|pahole|was built with|You are using \(out of date\)' || true
for m in $MODS; do
[ -f "$BUILD/$m.ko" ] || { echo "ERROR: $m.ko not produced"; exit 1; }
done
grep -q 'parm: *reg6_pwr_override:' <<< "$(modinfo "$BUILD/rtw89_core.ko")" \
|| { echo "ERROR: patched param reg6_pwr_override missing -> wrong/old source"; exit 1; }
[ "$(modinfo -F vermagic "$BUILD/rtw89_core.ko" | cut -d' ' -f1)" = "$KVER" ] \
|| { echo "ERROR: vermagic mismatch ($(modinfo -F vermagic "$BUILD/rtw89_core.ko" | cut -d' ' -f1) != $KVER)"; exit 1; }
echo "== BUILD OK: $(ls "$BUILD"/rtw89_*.ko | wc -l) module files for $KVER =="
dkms.conf
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# rtw89-steam-frame DKMS package
# Fetch-at-build wrapper: pulls the in-tree rtw89 source for whichever kernel
# DKMS is building against, applies the steam-frame patches, and builds.
PACKAGE_NAME="rtw89-steam-frame"
PACKAGE_VERSION="0.1"
MAKE[0]="bash build.sh"
CLEAN="true"
BUILT_MODULE_NAME[0]="rtw89_8852cu"
BUILT_MODULE_NAME[1]="rtw89_usb"
BUILT_MODULE_NAME[2]="rtw89_8852c"
BUILT_MODULE_NAME[3]="rtw89_core"
BUILT_MODULE_LOCATION[0]="."
BUILT_MODULE_LOCATION[1]="."
BUILT_MODULE_LOCATION[2]="."
BUILT_MODULE_LOCATION[3]="."
DEST_MODULE_LOCATION[0]="/updates/rtw89"
DEST_MODULE_LOCATION[1]="/updates/rtw89"
DEST_MODULE_LOCATION[2]="/updates/rtw89"
DEST_MODULE_LOCATION[3]="/updates/rtw89"
AUTOINSTALL="yes"
register.sh
Executable
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#!/usr/bin/env bash
# SPDX-License-Identifier: GPL-2.0-only
#
# rtw89-steam-frame - standalone DKMS package register/installer.
#
# Pulls the steam-frame patches from upstream (Davenport-Physics/rtw89-steam-frame)
# via git, stages the package into /usr/src, and runs dkms add/build/install so the
# patched rtw89 modules are kept working and auto-rebuilt on every kernel upgrade.
#
# Run as root (one password prompt): run0 bash register.sh
# Overrides (env):
# RTW89_UPSTREAM=<git-url> (default: https://github.com/Davenport-Physics/rtw89-steam-frame)
# RTW89_UPSTREAM_REF=<ref> (default: master)
# RTW89_KVER=<kernel-ver> (default: $(uname -r))
set -euo pipefail
PACKAGE_NAME="rtw89-steam-frame"
VERSION="0.1"
UPSTREAM="${RTW89_UPSTREAM:-https://github.com/Davenport-Physics/rtw89-steam-frame}"
UPSTREAM_REF="${RTW89_UPSTREAM_REF:-master}"
KVER="${RTW89_KVER:-$(uname -r)}"
HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
DST="/usr/src/$PACKAGE_NAME-$VERSION"
for c in git dkms curl patch make gcc modinfo depmod; do
command -v "$c" >/dev/null || { echo "error: '$c' not found"; exit 1; }
done
[ -d "/lib/modules/$KVER/build" ] || { echo "error: headers for $KVER not installed (install linux-headers)"; exit 1; }
[ "$(id -u)" -eq 0 ] || { echo "error: run as root ('sudo ./register.sh')"; exit 1; }
TMP="$(mktemp -d)"
trap 'rm -rf "$TMP"' EXIT
echo "== [1/5] pull patches from $UPSTREAM (@$UPSTREAM_REF)"
git clone --quiet --depth 1 --branch "$UPSTREAM_REF" --single-branch "$UPSTREAM" "$TMP/upstream"
ls "$TMP/upstream/patches/"*.patch >/dev/null 2>&1 || { echo "error: upstream has no patches/"; exit 1; }
echo "== [2/5] stage package -> $DST (kernel: $KVER)"
mkdir -p "$DST/patches"
cp "$HERE/dkms.conf" "$HERE/build.sh" "$DST/"
cp "$TMP/upstream/patches/"*.patch "$DST/patches/"
chmod +x "$DST/build.sh"
echo "== [3/5] dkms add (dropping any previous registration first)"
dkms status | grep -q "^$PACKAGE_NAME/$VERSION" && dkms remove "$PACKAGE_NAME/$VERSION" --all || true
dkms add "$DST"
echo "== [4/5] dkms build + install -k $KVER"
dkms build "$PACKAGE_NAME/$VERSION" -k "$KVER"
dkms install "$PACKAGE_NAME/$VERSION" -k "$KVER"
echo "== [5/5] verify"
dkms status "$PACKAGE_NAME/$VERSION"
echo " modinfo -n rtw89_core -> $(modinfo -n rtw89_core)"
echo " installed: $(ls /lib/modules/$KVER/updates/dkms/rtw89_*.ko.zst 2>/dev/null | tr '\n' ' ')"
echo
echo "REGISTER DONE - patches @$UPSTREAM_REF ($(git -C "$TMP/upstream" rev-parse --short HEAD))"