Comment # 7
on bug 107855
from Pontus Gråskæg
OK, symlinks done, initrd rebuilt Results are: With amdgpu.dc=0 System boots with normal behaviour. Laptop eDP screen works, VGA output works. I have no HDMI monitor to check if HDMI output works. With amdgpu.dc=1 I get a blank laptop screen (eDP) and (of course) no VGA, and I don't have an HDMI monitor to test the HDMI output. Given the problem I experienced before, I guessed that a blind input of my LUKS password would get me somewhere, so I enabled sshd beforehand so I could ssh into the laptop and save the dmesg ring buffer to a file. It shows a problem. I have extracted what I hope is the relevant part below, but have also attached full dmesg output for both the amdgpu.dc=0 and amdgpu=1 cases. [ 2.047839] [TTM] Initializing pool allocator [ 2.047849] [TTM] Initializing DMA pool allocator [ 2.047915] [drm] amdgpu: 1024M of VRAM memory ready [ 2.047919] [drm] amdgpu: 3072M of GTT memory ready. [ 2.047933] [drm] GART: num cpu pages 262144, num gpu pages 262144 [ 2.047971] [drm] PCIE GART of 1024M enabled (table at 0x000000F4007E9000). [ 2.048069] [drm] Internal thermal controller without fan control [ 2.048074] [drm] amdgpu: dpm initialized [ 2.049295] [drm] Found UVD firmware Version: 1.55 Family ID: 9 [ 2.049697] [drm] Found VCE firmware Version: 50.10 Binary ID: 2 [ 2.055250] [drm:dm_pp_get_static_clocks [amdgpu]] *ERROR* DM_PPLIB: invalid powerlevel state: 0! [ 2.055339] [drm] Unsupported Connector type:5! [ 2.055459] [drm:construct [amdgpu]] *ERROR* construct: Invalid Connector ObjectID from Adapter Service for connector index:3! type 0 expected 3 [ 2.055535] [drm:construct [amdgpu]] *ERROR* construct: Invalid Connector ObjectID from Adapter Service for connector index:4! type 0 expected 3 [ 2.055610] [drm:construct [amdgpu]] *ERROR* construct: Invalid Connector ObjectID from Adapter Service for connector index:5! type 0 expected 3 [ 2.055686] [drm:construct [amdgpu]] *ERROR* construct: Invalid Connector ObjectID from Adapter Service for connector index:6! type 0 expected 3 [ 2.067894] [drm] Display Core initialized with v3.1.59! [ 2.068603] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018 [ 2.068611] PGD 0 P4D 0 [ 2.068616] Oops: 0000 [#1] SMP NOPTI [ 2.068622] CPU: 2 PID: 177 Comm: systemd-udevd Not tainted 4.19.0-041900rc2-generic #201809022230 [ 2.068626] Hardware name: LENOVO 80EC/Lancer 5B3, BIOS A4CN40WW (V 2.09) 08/24/2015 [ 2.068759] RIP: 0010:dc_link_aux_transfer+0x88/0x160 [amdgpu] [ 2.068764] Code: 00 00 48 c7 45 a8 00 00 00 00 48 c7 45 a0 00 00 00 00 48 8b 16 48 8b 00 8b 52 14 48 8b 80 38 01 00 00 48 8b 9c d0 b0 01 00 00 <48> 8b 43 18 48 89 df 48 8b 40 48 e8 68 29 90 f3 8b 45 10 4c 89 6d [ 2.068770] RSP: 0018:ffffa2dec1133590 EFLAGS: 00010246 [ 2.068774] RAX: ffff8fba8a10b400 RBX: 0000000000000000 RCX: ffffa2dec1133708 [ 2.068777] RDX: 0000000000000000 RSI: ffff8fba8aa6cd00 RDI: ffff8fba8a10a400 [ 2.068780] RBP: ffffa2dec1133600 R08: 0000000000000001 R09: 0000000000000000 [ 2.068783] R10: ffffec6ac82a9b00 R11: 0000000000000001 R12: 0000000000000001 [ 2.068786] R13: ffffa2dec1133708 R14: 0000000000000000 R15: 0000000000000000 [ 2.068790] FS: 00007f3f17e1e8c0(0000) GS:ffff8fba97b00000(0000) knlGS:0000000000000000 [ 2.068794] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.068797] CR2: 0000000000000018 CR3: 000000020a948000 CR4: 00000000000406e0 [ 2.068800] Call Trace: [ 2.068882] dm_dp_aux_transfer+0x61/0x130 [amdgpu] [ 2.068899] drm_dp_dpcd_access+0x75/0x110 [drm_kms_helper] [ 2.068908] drm_dp_dpcd_read+0x33/0xc0 [drm_kms_helper] [ 2.068984] dm_helpers_dp_read_dpcd+0x2b/0x50 [amdgpu] [ 2.069057] core_link_read_dpcd+0x23/0x30 [amdgpu] [ 2.069130] retrieve_link_cap+0x55/0x440 [amdgpu] [ 2.069203] detect_edp_sink_caps+0x12/0x40 [amdgpu] [ 2.069276] dc_link_detect+0x54a/0xb30 [amdgpu] [ 2.069286] ? drm_dp_mst_topology_mgr_init+0x345/0x430 [drm_kms_helper] [ 2.069356] amdgpu_dm_initialize_drm_device+0x68d/0xb22 [amdgpu] [ 2.069429] ? setup_x_points_distribution+0x72/0x100 [amdgpu] [ 2.069498] dm_hw_init.cold.55+0x8c/0x116 [amdgpu] [ 2.069589] amdgpu_device_init.cold.28+0x113a/0x12e9 [amdgpu] [ 2.069596] ? kmalloc_order+0x18/0x40 [ 2.069600] ? kmalloc_order_trace+0x24/0xb0 [ 2.069647] amdgpu_driver_load_kms+0x8b/0x2d0 [amdgpu] [ 2.069672] drm_dev_register+0x11f/0x160 [drm] [ 2.069720] amdgpu_pci_probe+0x140/0x1c0 [amdgpu] [ 2.069725] local_pci_probe+0x46/0x90 [ 2.069728] pci_device_probe+0x18d/0x1a0 [ 2.069734] really_probe+0x243/0x3b0 [ 2.069737] driver_probe_device+0xba/0x100 [ 2.069741] __driver_attach+0xe4/0x110 [ 2.069744] ? driver_probe_device+0x100/0x100 [ 2.069748] bus_for_each_dev+0x74/0xb0 [ 2.069752] ? kmem_cache_alloc_trace+0x1c8/0x1e0 [ 2.069756] driver_attach+0x1e/0x20 [ 2.069760] bus_add_driver+0x159/0x230 [ 2.069763] ? 0xffffffffc0530000 [ 2.069766] driver_register+0x70/0xc0 [ 2.069769] ? 0xffffffffc0530000 [ 2.069773] __pci_register_driver+0x57/0x60 [ 2.069819] amdgpu_init+0x87/0x89 [amdgpu] [ 2.069824] do_one_initcall+0x4a/0x1c4 [ 2.069829] ? _cond_resched+0x19/0x30 [ 2.069833] ? kmem_cache_alloc_trace+0x172/0x1e0 [ 2.069836] ? kfree+0x15b/0x180 [ 2.069840] do_init_module+0x60/0x220 [ 2.069844] load_module+0x16c1/0x1930 [ 2.069848] __do_sys_finit_module+0xbd/0x120 [ 2.069852] ? __do_sys_finit_module+0xbd/0x120 [ 2.069856] __x64_sys_finit_module+0x1a/0x20 [ 2.069859] do_syscall_64+0x5a/0x110 [ 2.069863] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 2.069866] RIP: 0033:0x7f3f16c794d9 [ 2.069869] Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 8f 29 2c 00 f7 d8 64 89 01 48 [ 2.069874] RSP: 002b:00007ffecb3898d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 2.069877] RAX: ffffffffffffffda RBX: 000055d589f17be0 RCX: 00007f3f16c794d9 [ 2.069880] RDX: 0000000000000000 RSI: 000055d589eb5e90 RDI: 0000000000000016 [ 2.069882] RBP: 000055d589eb5e90 R08: 0000000000000000 R09: 000000000000001b [ 2.069885] R10: 0000000000000016 R11: 0000000000000246 R12: 0000000000000000 [ 2.069888] R13: 000055d589e9c0c0 R14: 0000000000020000 R15: 0000000000000000 [ 2.069891] Modules linked in: amdkfd amd_iommu_v2 amdgpu(+) crct10dif_pclmul crc32_pclmul ghash_clmulni_intel chash gpu_sched pcbc radeon aesni_intel aes_x86_64 i2c_algo_bit crypto_simd ttm cryptd psmouse glue_helper drm_kms_helper syscopyarea sysfillrect ahci sysimgblt fb_sys_fops libahci drm r8169 video rtsx_usb_sdmmc rtsx_usb [ 2.069916] CR2: 0000000000000018 [ 2.069920] ---[ end trace 7fedfef671967588 ]--- [ 2.069982] RIP: 0010:dc_link_aux_transfer+0x88/0x160 [amdgpu] [ 2.069985] Code: 00 00 48 c7 45 a8 00 00 00 00 48 c7 45 a0 00 00 00 00 48 8b 16 48 8b 00 8b 52 14 48 8b 80 38 01 00 00 48 8b 9c d0 b0 01 00 00 <48> 8b 43 18 48 89 df 48 8b 40 48 e8 68 29 90 f3 8b 45 10 4c 89 6d [ 2.069989] RSP: 0018:ffffa2dec1133590 EFLAGS: 00010246 [ 2.069992] RAX: ffff8fba8a10b400 RBX: 0000000000000000 RCX: ffffa2dec1133708 [ 2.069995] RDX: 0000000000000000 RSI: ffff8fba8aa6cd00 RDI: ffff8fba8a10a400 [ 2.069997] RBP: ffffa2dec1133600 R08: 0000000000000001 R09: 0000000000000000 [ 2.070000] R10: ffffec6ac82a9b00 R11: 0000000000000001 R12: 0000000000000001 [ 2.070002] R13: ffffa2dec1133708 R14: 0000000000000000 R15: 0000000000000000 [ 2.070005] FS: 00007f3f17e1e8c0(0000) GS:ffff8fba97b00000(0000) knlGS:0000000000000000 [ 2.070008] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.070010] CR2: 0000000000000018 CR3: 000000020a948000 CR4: 00000000000406e0
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