* [PATCH 6.18 094/227] ALSA: usb: Increase volume range that triggers a warning
[not found] <20260128145344.331957407@linuxfoundation.org>
@ 2026-01-28 15:22 ` Greg Kroah-Hartman
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From: Greg Kroah-Hartman @ 2026-01-28 15:22 UTC (permalink / raw)
To: stable
Cc: Greg Kroah-Hartman, patches, Jaroslav Kysela, Takashi Iwai,
linux-sound, Arun Raghavan, Takashi Iwai, Sasha Levin
6.18-stable review patch. If anyone has any objections, please let me know.
------------------
From: Arun Raghavan <arunr@valvesoftware.com>
[ Upstream commit 6b971191fcfc9e3c2c0143eea22534f1f48dbb62 ]
On at least the HyperX Cloud III, the range is 18944 (-18944 -> 0 in
steps of 1), so the original check for 255 steps is definitely obsolete.
Let's give ourselves a little more headroom before we emit a warning.
Fixes: 80acefff3bc7 ("ALSA: usb-audio - Add volume range check and warn if it too big")
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: linux-sound@vger.kernel.org
Signed-off-by: Arun Raghavan <arunr@valvesoftware.com>
Link: https://patch.msgid.link/20260116225804.3845935-1-arunr@valvesoftware.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
sound/usb/mixer.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 3af71d42b9b9a..90917c6ea871b 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -1813,11 +1813,10 @@ static void __build_feature_ctl(struct usb_mixer_interface *mixer,
range = (cval->max - cval->min) / cval->res;
/*
- * Are there devices with volume range more than 255? I use a bit more
- * to be sure. 384 is a resolution magic number found on Logitech
- * devices. It will definitively catch all buggy Logitech devices.
+ * There are definitely devices with a range of ~20,000, so let's be
+ * conservative and allow for a bit more.
*/
- if (range > 384) {
+ if (range > 65535) {
usb_audio_warn(mixer->chip,
"Warning! Unlikely big volume range (=%u), cval->res is probably wrong.",
range);
--
2.51.0
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