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From: Jeff Woods <>
To: "stable" <>
Cc: "regressions" <>
Subject: Kernel 5.13.6 breaks mmap with snd-hdsp module
Date: Sat, 07 Aug 2021 00:49:07 -0700	[thread overview]
Message-ID: <> (raw)

Specifically, commit c4824ae7db418aee6f50f308a20b832e58e997fd triggers the problem. Reverting this change restores functionality.

The device is an RME Multiface II, using the snd-hdsp driver.

Expected behavior: Device plays sound normally

Exhibited behavior: When a program attempts to open the device, the following ALSA lib error happens:

ALSA lib pcm_direct.c:1169:(snd1_pcm_direct_initialize_slave) slave plugin does not support mmap interleaved or mmap noninterleaved access

This change hasn't affected my other computers with less esoteric hardware, so probably the problem lies with the snd-hdsp driver, but the device is unusable without reverting that commit.

I am available to test any patches for this issue.

J Woods

             reply	other threads:[~2021-08-07  7:49 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-07  7:49 Jeff Woods [this message]
2021-08-07  8:16 ` Kernel 5.13.6 breaks mmap with snd-hdsp module Greg KH
2021-08-07  9:26   ` Takashi Iwai
2021-08-07 22:51     ` Jeff Woods
2021-08-08  7:01       ` Takashi Iwai
2021-08-08 19:09         ` Jeff Woods
2021-08-09  6:50           ` Greg KH
2021-08-09  6:55           ` Takashi Iwai

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