[Bug 105018] Kernel panic when waking up after screen goes blank.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105018

--- Comment #31 from Öyvind Saether <oyvinds at everdot.org> ---
Kernel 4.17.0-rc3-linus.git-keumjo4.17.0-rc3-linus.git-keumjo on a 2400G with a
RX 560 GPU:

> login to xfce desktop
> type "xset dpms force standby" in a terminal
screens go blank and there is no more response from the box, looks dead. But
it's possible to ssh into it and find the following information in dmesg:

[12743.692027] ------------[ cut here ]------------
[12743.692030] kernel BUG at
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:4708!
[12743.692039] invalid opcode: 0000 [#1] SMP NOPTI
[12743.692041] Modules linked in: twofish_generic twofish_avx_x86_64
twofish_x86_64_3way twofish_x86_64 twofish_common loop serpent_avx2
serpent_avx_x86_64 serpent_sse2_x86_64 serpent_generic rfcomm fuse
rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd grace fscache
nf_conntrack_netbios_ns nf_conntrack_broadcast xt_CT ip6t_rpfilter ip6t_REJECT
nf_reject_ipv6 xt_conntrack ip_set nfnetlink ebtable_nat ebtable_broute bridge
stp llc ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6
ip6table_mangle lz4 lz4_compress ip6table_raw ip6table_security iptable_nat
nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack libcrc32c
iptable_mangle iptable_raw iptable_security ebtable_filter ebtables
ip6table_filter ip6_tables cmac bnep sunrpc vfat fat snd_hda_codec_realtek
snd_hda_codec_generic
[12743.692069]  snd_hda_codec_hdmi snd_hda_intel btusb snd_hda_codec btrtl
btbcm edac_mce_amd btintel bluetooth snd_hda_core snd_hwdep snd_seq kvm_amd ccp
wmi_bmof kvm snd_seq_device snd_pcm ecdh_generic snd_timer irqbypass rfkill
joydev pcspkr snd soundcore shpchp i2c_piix4 k10temp wmi video acpi_cpufreq
binfmt_misc dm_crypt amdkfd raid1 amd_iommu_v2 amdgpu chash i2c_algo_bit
gpu_sched drm_kms_helper ttm drm crct10dif_pclmul crc32_pclmul crc32c_intel
ghash_clmulni_intel r8169 mii
[12743.692091] CPU: 6 PID: 3708 Comm: Xorg Not tainted
4.17.0-rc3-linus.git-keumjo #3
[12743.692093] Hardware name: System manufacturer System Product Name/TUF
B350M-PLUS GAMING, BIOS 4009 04/14/2018
[12743.692154] RIP: 0010:dm_update_crtcs_state+0x419/0x480 [amdgpu]
[12743.692156] RSP: 0018:ffffb4e688f07b30 EFLAGS: 00010246
[12743.692158] RAX: ffff8b720090d001 RBX: ffff8b720527d000 RCX:
000000000008dccc
[12743.692160] RDX: 000000000008dccb RSI: ffff8b723eda6160 RDI:
ffff8b723e806e80
[12743.692162] RBP: ffff8b720275c000 R08: 0000000000026160 R09:
0000000000000000
[12743.692163] R10: ffffdb50a0024200 R11: 0000000000000a00 R12:
0000000000000000
[12743.692165] R13: ffff8b7205189800 R14: ffff8b720090ec00 R15:
ffff8b71f16c8a00
[12743.692167] FS:  00007f88668e2ac0(0000) GS:ffff8b723ed80000(0000)
knlGS:0000000000000000
[12743.692169] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[12743.692170] CR2: 00007f885f886000 CR3: 00000007fbc90000 CR4:
00000000003406e0
[12743.692172] Call Trace:
[12743.692231]  amdgpu_dm_atomic_check+0x1b1/0x3b0 [amdgpu]
[12743.692248]  drm_atomic_check_only+0x360/0x4f0 [drm]
[12743.692264]  drm_atomic_commit+0x13/0x50 [drm]
[12743.692278]  drm_atomic_connector_commit_dpms+0xdb/0x100 [drm]
[12743.692292]  drm_mode_obj_set_property_ioctl+0x178/0x280 [drm]
[12743.692307]  ? drm_mode_connector_set_obj_prop+0x80/0x80 [drm]
[12743.692320]  drm_mode_connector_property_set_ioctl+0x39/0x60 [drm]
[12743.692333]  drm_ioctl_kernel+0x5b/0xb0 [drm]
[12743.692346]  drm_ioctl+0x1b3/0x370 [drm]
[12743.692359]  ? drm_mode_connector_set_obj_prop+0x80/0x80 [drm]
[12743.692364]  ? _cond_resched+0x15/0x30
[12743.692404]  amdgpu_drm_ioctl+0x49/0x80 [amdgpu]
[12743.692408]  do_vfs_ioctl+0xa4/0x610
[12743.692411]  ksys_ioctl+0x60/0x90
[12743.692414]  ? ksys_read+0x9c/0xb0
[12743.692416]  __x64_sys_ioctl+0x16/0x20
[12743.692420]  do_syscall_64+0x5b/0x160
[12743.692423]  ? entry_SYSCALL_64_after_hwframe+0x44/0xa9
[12743.692425] Code: ff ff e9 21 fe ff ff 48 83 3c 24 00 0f 84 2f fe ff ff 48
8b 3c 24 e8 e7 99 07 00 80 7c 24 0f 00 0f 85 02 fe ff ff e9 40 ff ff ff <0f> 0b
48 83 c4 20 b8 ea ff ff ff 5b 5d 41 5c 41 5d 41 5e 41 5f 
[12743.692510] RIP: dm_update_crtcs_state+0x419/0x480 [amdgpu] RSP:
ffffb4e688f07b30
[12743.692525] ---[ end trace fb5e2b69e8f8d9c9 ]---

There's no recovery from this; service lightdm restart doesn't restart it.
shutdown -r now doens't reboot either, just hangs (can't tell why since screens
are blank and ssh closes)

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