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Sun, 25 Jan 2026 08:44:43 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id jCiuJPvXdWn7UAAAD6G6ig (envelope-from ); Sun, 25 Jan 2026 08:44:43 +0000 Date: Sun, 25 Jan 2026 09:44:43 +0100 Message-ID: <87a4y2cc90.wl-tiwai@suse.de> From: Takashi Iwai To: Ruslan Garynin Cc: "Geoffrey D. Bennett" , Jaroslav Kysela , Takashi Iwai , linux-sound@vger.kernel.org Subject: Re: Scarlett 16i16 4th Gen: I/O error on kernel 6.19-rc6 (works on 6.18) In-Reply-To: References: User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/30.1 Mule/6.0 Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Spam-Score: -3.30 X-Spamd-Result: default: False [-3.30 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; FREEMAIL_TO(0.00)[gmail.com]; MIME_TRACE(0.00)[0:+]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[]; RCPT_COUNT_FIVE(0.00)[5] X-Spam-Level: X-Spam-Flag: NO On Sat, 24 Jan 2026 17:24:07 +0100, Geoffrey D. Bennett wrote: > > Hi Ruslan, > > Audio playback for Focusrite USB interfaces is handled by the generic > USB audio driver (snd-usb-audio); the FCP driver I maintain only > handles the control protocol (mixer, routing, etc.) over a separate > USB endpoint — it's not involved in the actual audio data transfer. > > I've CC'd the ALSA maintainers and linux-sound list to continue the > discussion there. > > Regards, > Geoffrey. > > On Sat, Jan 24, 2026 at 08:56:38PM +0500, Ruslan Garynin wrote: > > Hi Geoffrey, > > > > I found a regression affecting Scarlett 16i16 4th Gen playback on kernel > > 6.19-rc6. > > > > Summary: > > - Working: 6.18.6-zen1-1-zen > > - Broken: 6.19.0-rc6-1-mainline > > - Issue: I/O error on USB audio playback > > - HDA/HDMI audio works fine on 6.19-rc6, so it's USB audio specific > > > > Test: > >   systemctl --user stop pipewire pipewire-pulse wireplumber > >   speaker-test -D hw:3 -c 18 -t sine -F S32_LE > > > > On 6.18 (works): > >   0 - Front Left > >   1 - Front Right > >   ... > >   15 - Channel 16 > >   (sound plays) > > > > On 6.19-rc6 (fails): > >   0 - Front Left > >   Write error: -5,Input/output error > > > > Device info: > >   USB ID: 1235:821b > >   FCP driver loads OK: "Focusrite Control Protocol Driver ready" > >   Implicit Feedback Mode: Yes > >   No errors in dmesg > > > > /proc/asound/card3/stream0: > >   Format: S32_LE > >   Channels: 18 > >   Endpoint: 0x01 (1 OUT) (ASYNC) > >   Rates: 44100, 48000 > >   Sync Endpoint: 0x81 (1 IN) > >   Implicit Feedback Mode: Yes > > > > Note: This might get fixed on its own when mainline is updated further > > before > > the stable 6.19 release. I'm just reporting this in case it doesn't, so > > you're > > aware of a potential issue that could affect users when 6.19 changes > > eventually > > land in stable kernels. > > > > Let me know if you need any additional info or testing. > > > > Thanks for maintaining the Scarlett driver! > > > > Best regards, > > Ruslan Garynin Could you check whether the earlier 6.19-rc shows the same problem? Also check the very latest Linus tree, too. Takashi