[Bug 108100] RX480: HDMI display unavailable with amdgpu.dc=1, boot error drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_resource.c:1721

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=108100

            Bug ID: 108100
           Summary: RX480: HDMI display unavailable with amdgpu.dc=1, boot
                    error
                    drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_resou
                    rce.c:1721
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: jlp.bugs@gmail.com

Created attachment 141796
  --> https://bugs.freedesktop.org/attachment.cgi?id=141796&action=edit
dmesg-4.18.8

I have just upgraded my kernel on openSUSE Tumbleweed from 4.17.14 to 4.18.8
and my display that is a Panasonic 4K/UHD TV (TX-55CX400E) is not detected
anymore and not available after boot. I have to pass amdgpu.dc=0 kernel
paramater to get it available again.

If I check dmesg I can see a lot of lines like the following repeated:

[  195.633367] WARNING: CPU: 0 PID: 1979 at
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_resource.c:1721
dc_validate_stream+0xd5/0x100 [amdgpu]
[  195.633368] Modules linked in: fuse ccm af_packet iscsi_ibft
iscsi_boot_sysfs bluetooth ecdh_generic msr nct6775 hwmon_vid intel_rapl
x86_pkg_temp_thermal intel_powerclamp coretemp kvm nls_iso8859_1 nls_cp437 vfat
fat irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc
aesni_intel arc4 iTCO_wdt eeepc_wmi asus_wmi aes_x86_64 snd_hda_codec_realtek
snd_hda_codec_generic snd_hda_codec_hdmi iTCO_vendor_support mxm_wmi mt7601u
sparse_keymap wmi_bmof snd_hda_intel mac80211 snd_hda_codec crypto_simd cryptd
pcspkr snd_hda_core joydev glue_helper cfg80211 rfkill snd_hwdep snd_pcm
snd_timer snd fan soundcore e1000e ptp pps_core wmi thermal mei_me pcc_cpufreq
video i2c_i801 mei button acpi_pad btrfs libcrc32c xor zstd_decompress
zstd_compress xxhash hid_logitech_hidpp hid_logitech_dj hid_generic
[  195.633403]  usbhid raid6_pq amdkfd amd_iommu_v2 amdgpu crc32c_intel sr_mod
cdrom chash i2c_algo_bit gpu_sched drm_kms_helper syscopyarea sysfillrect
sysimgblt fb_sys_fops xhci_pci xhci_hcd ttm drm usbcore sg dm_multipath dm_mod
scsi_dh_rdac scsi_dh_emc scsi_dh_alua efivarfs
[  195.633418] CPU: 0 PID: 1979 Comm: X Tainted: G        W        
4.18.8-1-default #1 openSUSE Tumbleweed (unreleased)
[  195.633418] Hardware name: System manufacturer System Product Name/H170 PRO
GAMING, BIOS 3805 05/16/2018
[  195.633459] RIP: 0010:dc_validate_stream+0xd5/0x100 [amdgpu]
[  195.633461] Code: aa aa c1 e2 04 89 d0 f7 e1 c1 ea 04 89 93 68 02 00 00 e9
74 ff ff ff 5b b8 06 00 00 00 5d 41 5c c3 d1 ea eb c1 83 f9 02 74 e2 <0f> 0b 89
c2 eb dc 6b d2 1e b9 ab aa aa aa 89 d0 f7 e1 c1 ea 04 eb 
[  195.633490] RSP: 0018:ffffb004c8fbbb78 EFLAGS: 00010297
[  195.633491] RAX: 0000000000091050 RBX: ffff97358c10f400 RCX:
0000000000000005
[  195.633492] RDX: 0000000000091050 RSI: ffff97358c10f400 RDI:
ffff9735915a0080
[  195.633493] RBP: ffff97353c118e00 R08: 0000000000000000 R09:
00000000000004b0
[  195.633494] R10: ffff97358c10f400 R11: 0000000000000780 R12:
ffff97358fe1b600
[  195.633495] R13: ffff972f0cd88a10 R14: 0000000000000000 R15:
ffff972f0cd88800
[  195.633496] FS:  00007fcb3d8ab940(0000) GS:ffff9735b6c00000(0000)
knlGS:0000000000000000
[  195.633497] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  195.633498] CR2: 000056287912f3b8 CR3: 00000007ee834005 CR4:
00000000003606f0
[  195.633499] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[  195.633500] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[  195.633500] Call Trace:
[  195.633545]  amdgpu_dm_connector_mode_valid+0x6d/0x1d0 [amdgpu]
[  195.633551]  drm_helper_probe_single_connector_modes+0x47f/0x690
[drm_kms_helper]
[  195.633565]  drm_mode_getconnector+0x3af/0x3d0 [drm]
[  195.633577]  ? drm_mode_connector_property_set_ioctl+0x30/0x30 [drm]
[  195.633586]  drm_ioctl_kernel+0x81/0xd0 [drm]
[  195.633595]  drm_ioctl+0x1da/0x360 [drm]
[  195.633604]  ? drm_mode_connector_property_set_ioctl+0x30/0x30 [drm]
[  195.633633]  amdgpu_drm_ioctl+0x49/0x80 [amdgpu]
[  195.633636]  do_vfs_ioctl+0x90/0x5e0
[  195.633638]  ? __fget+0x6e/0xa0
[  195.633641]  ksys_ioctl+0x60/0x90
[  195.633644]  __x64_sys_ioctl+0x16/0x20
[  195.633646]  do_syscall_64+0x60/0x110
[  195.633649]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  195.633650] RIP: 0033:0x7fcb3c27baa7
[  195.633650] Code: 00 00 90 48 8b 05 f1 83 2c 00 64 c7 00 26 00 00 00 48 c7
c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01
f0 ff ff 73 01 c3 48 8b 0d c1 83 2c 00 f7 d8 64 89 01 48 
[  195.633679] RSP: 002b:00007ffff09eb918 EFLAGS: 00003246 ORIG_RAX:
0000000000000010
[  195.633682] RAX: ffffffffffffffda RBX: 00005575382a36c0 RCX:
00007fcb3c27baa7
[  195.633683] RDX: 00007ffff09eb950 RSI: 00000000c05064a7 RDI:
000000000000000d
[  195.633683] RBP: 00007ffff09eb950 R08: 00005575382a2ac0 R09:
0000000000000007
[  195.633684] R10: 00007fcb3c2dee90 R11: 0000000000003246 R12:
00000000c05064a7
[  195.633685] R13: 000000000000000d R14: 000000000000000d R15:
00007ffff09eb950
[  195.633688] ---[ end trace a58eb9c235a952c1 ]---

I also have another LCD monitor (Samsung SyncMaster 215TW) connected via DVI to
the MSI Radeon RX 480 Gaming X 8G graphics card and that one works just fine.

I tried older kernels and it looks like the problem is here since 4.18.0.

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