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.