[Bug 108261] New: [regression] [bisected] radeon HDMI audio broken for HD 5450 (cedar)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=108261

            Bug ID: 108261
           Summary: [regression] [bisected] radeon HDMI audio broken for
                    HD 5450 (cedar)
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.0 and later
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: cvoeten at gmail.com
        Regression: No

summary: HDMI audio on radeon HD5450 not working since kernel 4.0; bisected to
b20932dd62f77a96124ec8f0c7ad0908b5584526; fails to revert under 4.3 so couldn't
test further.


On two machines, my HD 5450 will not play HDMI audio any more since kernel 4.0,
even though the same set-up works with kernel 3.18.24. Instead of working
audio, I get 9 repetitions of the below message in my syslog:

sound hdaudioC1D0: HDMI ATI/AMD: no speaker allocation for ELD

Bisecting reveals:

b20932dd62f77a96124ec8f0c7ad0908b5584526 is the first bad commit
commit b20932dd62f77a96124ec8f0c7ad0908b5584526
Author: Alex Deucher <alexander.deucher at amd.com>
Date:   Fri Feb 27 10:51:40 2015 -0500

    drm/radeon/audio: update EDID derived fields in modeset

    We don't necessarily have an EDID at this point when
    audio detect gets called.  Ideally we'd update these
    fields in detect, but that requires a larger rework
    of the display detect code.

    Signed-off-by: Alex Deucher <alexander.deucher at amd.com>

:040000 040000 062dd016364d978dc778f63fd4593b8dfd05e90e
85a53112b2d7d747481f6dbb60b1a5e25de8f0b5 M    drivers

which looks very much like it could indeed be the culprit. Unfortunately, I
cannot revert this patch on the latest kernel (4.3), so I cannot test whether
this is indeed the definitive problem.

Thank you for your time. Please let me know if there is anything I can report
or test for you.

$ zgrep -i radeon /proc/config.gz
CONFIG_EXTRA_FIRMWARE="rtl_nic/rtl8168e-2.fw radeon/CEDAR_me.bin
radeon/CEDAR_pfp.bin radeon/CEDAR_rlc.bin radeon/CYPRESS_uvd.bin
radeon/CEDAR_smc.bin"
CONFIG_DRM_RADEON=y
# CONFIG_DRM_RADEON_UMS is not set
# CONFIG_FB_RADEON is not set

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