Red Hat Bugzilla – Bug 1309658
Audio devices not found with Linux 4.5.0
Last modified: 2016-03-04 08:18:51 EST
Using Rawhide fully up to date as at 2016-02-18T11:36.
If I boot 4.4.0 kernel everything works fine. If I boot the 4.5.0 kernel then the audio devices are not found by GNOME. They are there in the lspci listing, but nothing appears in the GNOME settings and sound will not play.
01:00.1 Audio device: NVIDIA Corporation GF119 HDMI Audio Controller (rev a1)
09:02.0 Multimedia audio controller: Creative Labs SB Live! EMU10k1 (rev 05)
09:02.1 Input device controller: Creative Labs SB Live! Game Port (rev 05)
This problem appears for me only for my Dell Precision T5400 workstation. My Lenovo ThinkPad laptops seem to be happily picking up the built in speakers.
This bug appears to have been reported against 'rawhide' during the Fedora 24 development cycle.
Changing version to '24'.
More information and reason for this action is here:
I note that there is a similar problem booting Debian Sid. There though everything works fine with kernel 4.2 and 4.3, but fails with kernel 4.4.
Maybe this is a kernel problem rather than a GNOME audio one. Should I reports a new bug or should this one be transferred to the people who are best positioned to fix the issue?
The problem seems to be that the emu10k drivers are not being distributed with the 4.5 kernel.
|> find /usr/lib -iname "*emu10k*"
So 4.5 brought in changes for ZONE_DEVICE which is needed for persistent memory devices. The version that was merged required ZONE_DMA be turned off. That particular module depends on ZONE_DMA so it was not being built at all.
There's a patch to fix this. I put it in rawhide. You should see the change in the next rawhide build.
The necessary files appear to be back in rc6, certainly sound works again :-)
Thanks for getting the patch in place.