[Bug 199493] no audio over HDMI with amdgpu.dc=1 (on R9 380X)

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=199493

--- Comment #6 from haro41@gmx.de ---
This issue (no HDMI sound with amdgpu_dc=1) still exist in 4.17.0-rc7. 
The following warning is the first of many others in dmesg log:

[   10.067233] WARNING: CPU: 11 PID: 367 at
drivers/gpu/drm/amd/amdgpu/../display/dc/dm_services.h:132
generic_reg_update_ex+0x102/0x150 [amdgpu]
[   10.067235] Modules linked in: amdgpu(+) intel_powerclamp binfmt_misc
coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc btusb btrtl
btbcm btintel bluetooth wmi_bmof chash snd_hda_codec_hdmi i2c_algo_bit
gpu_sched drbg ttm snd_hda_intel drm_kms_helper ansi_cprng snd_hda_codec joydev
snd_hwdep syscopyarea sysfillrect snd_hda_core sysimgblt fb_sys_fops
ecdh_generic snd_pcm drm snd_timer snd aesni_intel soundcore aes_x86_64
crypto_simd cryptd glue_helper sg lpc_ich mfd_core evdev shpchp wmi button
uinput ip_tables x_tables autofs4 hid_generic usbhid hid ext4 crc32c_generic
crc16 mbcache jbd2 fscrypto sd_mod xhci_pci xhci_hcd ahci crc32c_intel libahci
ehci_pci libata ehci_hcd e100 i2c_i801 scsi_mod mii usbcore
[   10.067346] CPU: 11 PID: 367 Comm: systemd-udevd Not tainted 4.17.0-rc7 #2
[   10.067427] RIP: 0010:generic_reg_update_ex+0x102/0x150 [amdgpu]
[   10.067429] RSP: 0018:ffffb8ed4071f3f8 EFLAGS: 00010246
[   10.067433] RAX: ffffb8ed4071f418 RBX: ffff8e337604cf00 RCX:
0000000000000000
[   10.067435] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
ffff8e339fb96e00
[   10.067437] RBP: ffffb8ed4071f468 R08: 0000000000000000 R09:
0000000000000000
[   10.067438] R10: ffffb8ed4071f480 R11: 0000000000000001 R12:
0000000000000001
[   10.067440] R13: 0000000000000000 R14: ffff8e339aa0e000 R15:
ffff8e335efe8188
[   10.067443] FS:  00007fa4782c88c0(0000) GS:ffff8e33a7400000(0000)
knlGS:0000000000000000
[   10.067445] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   10.067447] CR2: 00007fa4782f7a8c CR3: 00000005dd52c003 CR4:
00000000000606e0
[   10.067449] Call Trace:
[   10.067544]  dce110_stream_encoder_update_hdmi_info_packets+0x357/0x550
[amdgpu]
[   10.067628]  dce110_apply_ctx_to_hw+0x6e5/0x860 [amdgpu]
[   10.067718]  dc_commit_state+0x2de/0x540 [amdgpu]
[   10.067792]  ? set_freesync_on_streams.part.6+0x4d/0x250 [amdgpu]
[   10.067867]  ? mod_freesync_set_user_enable+0x11d/0x150 [amdgpu]
[   10.067951]  amdgpu_dm_atomic_commit_tail+0x35b/0xd10 [amdgpu]
[   10.067967]  ? drm_atomic_helper_swap_state+0x25a/0x380 [drm_kms_helper]
[   10.067980]  ? _raw_spin_unlock+0x24/0x30
[   10.067994]  commit_tail+0x3a/0x70 [drm_kms_helper]
[   10.068004]  drm_atomic_helper_commit+0x11c/0x130 [drm_kms_helper]
[   10.068015]  restore_fbdev_mode_atomic+0x1b2/0x220 [drm_kms_helper]
[   10.068040]  drm_fb_helper_restore_fbdev_mode_unlocked+0x47/0x90
[drm_kms_helper]
[   10.068050]  drm_fb_helper_set_par+0x29/0x50 [drm_kms_helper]
[   10.068055]  fbcon_init+0x4de/0x680
[   10.068066]  visual_init+0xcf/0x130
[   10.068072]  do_bind_con_driver+0x1ef/0x3f0
[   10.068083]  do_take_over_console+0x7b/0x180
[   10.068090]  do_fbcon_takeover+0x58/0xb0
[   10.068095]  notifier_call_chain+0x45/0x70
[   10.068102]  blocking_notifier_call_chain+0x44/0x60
[   10.068108]  register_framebuffer+0x294/0x350
[   10.068126]  __drm_fb_helper_initial_config_and_unlock+0x229/0x490
[drm_kms_helper]
[   10.068196]  amdgpu_fbdev_init+0xc4/0xf0 [amdgpu]
[   10.068257]  amdgpu_device_init+0xd60/0x1460 [amdgpu]
[   10.068268]  ? kmalloc_order+0x18/0x40
[   10.068327]  amdgpu_driver_load_kms+0x78/0x200 [amdgpu]
[   10.068349]  drm_dev_register+0x131/0x1c0 [drm]
[   10.068409]  amdgpu_pci_probe+0x13f/0x200 [amdgpu]
[   10.068421]  pci_device_probe+0xc8/0x140
[   10.068429]  driver_probe_device+0x302/0x470
[   10.068436]  __driver_attach+0xb9/0xe0
[   10.068440]  ? driver_probe_device+0x470/0x470
[   10.068444]  ? driver_probe_device+0x470/0x470
[   10.068447]  bus_for_each_dev+0x76/0xc0
[   10.068455]  bus_add_driver+0x164/0x260
[   10.068459]  ? 0xffffffffc0de5000
[   10.068464]  driver_register+0x57/0xc0
[   10.068467]  ? 0xffffffffc0de5000
[   10.068471]  do_one_initcall+0x5d/0x1e3
[   10.068478]  ? _cond_resched+0x15/0x40
[   10.068483]  ? kmem_cache_alloc_trace+0x18e/0x1e0
[   10.068487]  ? do_init_module+0x22/0x201
[   10.068493]  do_init_module+0x5b/0x201
[   10.068498]  load_module+0x21f8/0x2a50
[   10.068511]  ? ima_post_read_file+0x102/0x110
[   10.068530]  ? __do_sys_finit_module+0xe9/0x110
[   10.068533]  __do_sys_finit_module+0xe9/0x110
[   10.068550]  do_syscall_64+0x49/0xe0
[   10.068555]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   10.068558] RIP: 0033:0x7fa477c098f9
[   10.068560] RSP: 002b:00007fffe9e1bbb8 EFLAGS: 00000246 ORIG_RAX:
0000000000000139
[   10.068563] RAX: ffffffffffffffda RBX: 0000557789eac330 RCX:
00007fa477c098f9
[   10.068565] RDX: 0000000000000000 RSI: 0000557789edf2b0 RDI:
0000000000000018
[   10.068567] RBP: 0000557789edf2b0 R08: 0000000000000000 R09:
0000000000000000
[   10.068569] R10: 0000000000000018 R11: 0000000000000246 R12:
0000000000000000
[   10.068571] R13: 0000557789ea0820 R14: 0000000000020000 R15:
0000000000000000
[   10.068587] Code: 18 89 da 48 8b 07 ff 50 08 48 8b 75 a8 65 48 33 34 25 28
00 00 00 89 d8 75 18 48 83 c4 50 5b 41 5a 41 5c 41 5d 5d c3 0f 0b eb b9 <0f> 0b
e9 48 ff ff ff e8 d2 06 5d f9 41 ba 01 00 00 00 44 89 c0 
[   10.068673] ---[ end trace 5d19fb5dcccc4b59 ]---

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