| Summary: | media-libs/alsa-lib-1.0.25-r1 - ALSA lib seq_hw.c:457:(snd_seq_hw_open) open /dev/snd/seq failed: Permission denied Cannot open sequencer - Permission denied | ||
|---|---|---|---|
| Product: | Gentoo Linux | Reporter: | yermandu <yermandu> |
| Component: | New packages | Assignee: | Gentoo ALSA team <alsa-bugs> |
| Status: | RESOLVED INVALID | ||
| Severity: | normal | CC: | alex |
| Priority: | Normal | ||
| Version: | unspecified | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Package list: | Runtime testing required: | --- | |
| Attachments: | emerge --info | ||
modprobe does not reload the module, it just loads it. Have you tried building the ALSA core & MIDI sequencer into the kernel proper? If not, does that resolve your issue? I am having the exact same issue. It seems that once something accesses /dev/snd/seq as root the permissions are fixed. On initial login: ls -la /dev/snd/seq crw------- 1 root root 116, 1 Mar 5 09:41 /dev/snd/seq After running /usr/lib64/portmidi/latency as root: ls -la /dev/snd/seq crw-rw---- 1 root audio 116, 1 Mar 5 17:48 /dev/snd/seq This only occurs with alsa-lib-1.0.25, alsa-lib-1.0.24.1 works fine. I have not tired to build the modules into the kernel yet. I will try that next and report back. I take that back, for some reason I cannot build alsa directly into the kernel. (In reply to comment #3) > I take that back, for some reason I cannot build alsa directly into the > kernel. I can: chainsaw@adrastea ~ $ zgrep -i seq /proc/config.gz CONFIG_SND_SEQUENCER=y Even on very new kernels: chainsaw@adrastea ~ $ uname -a Linux adrastea 3.3.0-rc6-00010-ga5939ee #1 SMP PREEMPT Mon Mar 5 15:21:51 GMT 2012 x86_64 Intel(R) Core(TM) i7-2620M CPU @ 2.70GHz GenuineIntel GNU/Linux Building your ALSA core & drivers into the kernel is the recommended configuration, and deviating from it is unsupported. Unmaintained module loading infrastructure has been removed, as subtle breakage has been introduced consistently and irrevocably. It was the only action for me to take. Your "permission issue" is a simple absence of the module. I can't think of a situation where you would *not* want a sequencer loaded. Build it into the kernel, and your problems will disappear. There is nothing for me to fix here. |
Created attachment 303971 [details] emerge --info The alsa seq midi drivers are not load with correct permissions: $ aplaymidi -l ALSA lib seq_hw.c:457:(snd_seq_hw_open) open /dev/snd/seq failed: Permission denied Cannot open sequencer - Permission denied To workaround after login, reload snd-seq # modprobe snd-seq Then the correct permission are loaded. $ aplaymidi -l Port Client name Port name 14:0 Midi Through Midi Through Port-0 sys-fs/udev-171-r5