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Mon, 28 Sep 2026 12:30:58 +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 h91rLAJeumpmfQAAD6G6ig (envelope-from ); Mon, 28 Sep 2026 12:30:58 +0000 Date: Mon, 28 Sep 2026 14:30:58 +0200 Message-ID: <87eced5zi5.wl-tiwai@suse.de> From: Takashi Iwai To: Dany Patoine Cc: alsa-devel@alsa-project.org, regressions@lists.linux.dev Subject: Re: [REGRESSION 6.14 -> 7.0] ALSA snd-ctxfi: no PCM playback on Creative X-Fi Titanium HD (EMU20k2 / SB1270) In-Reply-To: References: User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/30.2 Mule/6.0 Precedence: bulk X-Mailing-List: regressions@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Spam-Level: X-Spam-Score: -3.30 X-Spam-Flag: NO X-Spamd-Result: default: False [-3.30 / 50.00]; BAYES_HAM(-3.00)[100.00%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; ARC_NA(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FREEMAIL_TO(0.00)[hotmail.com]; MIME_TRACE(0.00)[0:+]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FREEMAIL_ENVRCPT(0.00)[hotmail.com]; RCVD_TLS_ALL(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.de:mid] On Mon, 28 Sep 2026 01:51:04 +0200, Dany Patoine wrote: > > Hello, > > I am reporting a playback regression in the snd-ctxfi driver affecting a > Creative Sound Blaster X-Fi Titanium HD. The card works perfectly on kernel > 6.14 but produces no audible PCM playback on kernel 7.0. > > HARDWARE > - Card:   Creative Sound Blaster X-Fi Titanium HD (model SB1270) > - Chip:   EMU20k2 / CA20K2 > - PCI:    02:00.0 Audio device [0403]: Creative Labs EMU20k2 >           [Sound Blaster X-Fi Titanium Series] [1102:000b] (rev 03) > - Driver: snd_ctxfi (with module option use_system_timer=1) > - System: ASUS P8H67-M PRO, Intel Core i5-2400, x86_64 > > SOFTWARE > - Distribution: Linux Mint 22.3 (Ubuntu 24.04 "noble" base) > - Sound server: PipeWire + WirePlumber > - WORKS:  kernel 6.14.0-37-generic  (Ubuntu HWE) > - BROKEN: kernel 7.0.0-31-generic and 7.0.0-34-generic (Ubuntu HWE 7.0) > > SYMPTOM > On 7.0, PCM playback produces no audible output, through BOTH paths: > >   (a) Direct ALSA, bypassing PipeWire: >         speaker-test -D plughw:CARD=XFi,DEV=0 -c 2 -t sine -f 440 >       completes with exit code 0, but no sound is produced. > >   (b) The normal PipeWire path (default sink = the X-Fi): >       also completely silent. > > Details of the failure mode: >   - kernel 7.0.0-31: truncated / choppy fragments with use_system_timer=1, >     and total silence with use_system_timer=0. >   - kernel 7.0.0-34: total silence with use_system_timer=1. >   - No xrun and no error is logged; playback appears to stall silently. > > On kernel 6.14.0-37, the exact same commands and configuration > (use_system_timer=1) produce clean, continuous audio. > > RULED OUT (all verified while booted on the failing 7.0 kernel) >   - Card detection: OK. snd_ctxfi loads without error; `aplay -l` lists >     card "XFi [Creative X-Fi]" with all PCM devices (Front/WaveIn, >     Surround, Center/LFE, Side, IEC958 Non-audio). >   - Mixer / routing: Master 98%, PCM 100% (no playback mute), Front [on] >     100%, "Analog Output" = Speakers. PipeWire's default sink is the X-Fi >     at 94% and is not muted. >   - use_system_timer: both values tested (0 and 1), neither gives >     continuous sound on 7.0. > > RELATION TO A KNOWN FIX > This appears to be DISTINCT from the EMU20k2 regression fixed by commit > e9418da50d9e ("ALSA: ctxfi: Limit PTP to a single page"): that issue only > affected PulseAudio while direct ALSA (speaker-test) kept working. Here, > direct ALSA is ALSO silent, so it looks like a different problem. > > WHAT I CAN PROVIDE > These kernels are Ubuntu-packaged, not vanilla mainline. On request I can: >   - provide full dmesg from a 7.0 boot and `alsa-info.sh` output, >   - test a vanilla mainline 7.0.x / 7.1.x kernel, >   - test any candidate patch, >   - perform a git bisect between 6.14 and 7.0 if that would help. Could you verify the latest 7.3-rc5 kernel to see whether the regression is still present at first? If the bug is still there, please go bisection. thanks, Takashi