Unfortunately I don't know how to apply this patch/patches.

Updated to new kernel 5.2.11-200.fc30.x86_64, problem still exists.

Sep 04 19:45:23 kernel: WARNING: CPU: 2 PID: 1014 at drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_hw_sequencer.c:854 dcn10_verify_allow_pstate_change_high.cold+0xc/0x229 [amdgpu]
Sep 04 19:45:23 kernel: Modules linked in: ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 ipt_REJECT nf_reject_ipv4 xt_conntrack ebtable_nat ip6table_nat ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_nat iptable_mangle iptable_raw iptable_security nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c ip_set nfnetlink ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables sunrpc snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio snd_hda_codec_hdmi snd_hda_intel snd_hda_codec snd_hda_core edac_mce_amd snd_hwdep snd_seq ccp snd_seq_device snd_pcm snd_timer kvm snd irqbypass joydev soundcore sp5100_tco i2c_piix4 crct10dif_pclmul wmi_bmof crc32_pclmul k10temp ghash_clmulni_intel pcc_cpufreq gpio_amdpt gpio_generic acpi_cpufreq amdgpu amd_iommu_v2 gpu_sched i2c_algo_bit ttm drm_kms_helper crc32c_intel drm r8169 wmi video pinctrl_amd
Sep 04 19:45:23 kernel: CPU: 2 PID: 1014 Comm: InputThread Not tainted 5.2.11-200.fc30.x86_64 #1
Sep 04 19:45:23 kernel: Hardware name: Gigabyte Technology Co., Ltd. A320M-S2H V2/A320M-S2H V2-CF, BIOS F2 12/25/2018
Sep 04 19:45:23 kernel: RIP: 0010:dcn10_verify_allow_pstate_change_high.cold+0xc/0x229 [amdgpu]
Sep 04 19:45:23 kernel: Code: 83 c8 ff e9 85 af f9 ff 48 c7 c7 f8 20 78 c0 e8 e8 27 a6 f0 0f 0b 83 c8 ff e9 6f af f9 ff 48 c7 c7 f8 20 78 c0 e8 d2 27 a6 f0 <0f> 0b 80 bb 93 01 00 00 00 75 05 e9 c9 d3 f9 ff 48 8b 83 80 02 00
Sep 04 19:45:23 kernel: RSP: 0018:ffff9ba201da3a00 EFLAGS: 00010246
Sep 04 19:45:23 kernel: RAX: 0000000000000024 RBX: ffff8a12ce72c000 RCX: 0000000000000006
Sep 04 19:45:23 kernel: RDX: 0000000000000000 RSI: 0000000000000082 RDI: ffff8a12d8a97900
Sep 04 19:45:23 kernel: RBP: ffff8a12ce72c000 R08: 0000000000000001 R09: 00000000000003f9
Sep 04 19:45:23 kernel: R10: ffffffffb2bf03e0 R11: 0000000000000003 R12: ffff8a12caef81b8
Sep 04 19:45:23 kernel: R13: ffff8a12caef9bc8 R14: ffff8a12caef81b8 R15: ffff8a12b8420200
Sep 04 19:45:23 kernel: FS:  00007fc4cec4b700(0000) GS:ffff8a12d8a80000(0000) knlGS:0000000000000000
Sep 04 19:45:23 kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Sep 04 19:45:23 kernel: CR2: 00007f19f6f298a0 CR3: 00000001fb7e4000 CR4: 00000000003406e0
Sep 04 19:45:23 kernel: Call Trace:
Sep 04 19:45:23 kernel:  dcn10_pipe_control_lock.part.0+0x69/0x70 [amdgpu]
Sep 04 19:45:23 kernel:  dc_stream_set_cursor_attributes+0x121/0x170 [amdgpu]
Sep 04 19:45:23 kernel:  handle_cursor_update.isra.0+0x1af/0x310 [amdgpu]
Sep 04 19:45:23 kernel:  drm_atomic_helper_async_commit+0x63/0xd0 [drm_kms_helper]
Sep 04 19:45:23 kernel:  drm_atomic_helper_commit+0xdb/0x110 [drm_kms_helper]
Sep 04 19:45:23 kernel:  drm_atomic_helper_update_plane+0xec/0x100 [drm_kms_helper]
Sep 04 19:45:23 kernel:  drm_mode_cursor_universal+0x12c/0x240 [drm]
Sep 04 19:45:23 kernel:  drm_mode_cursor_common+0xc9/0x220 [drm]
Sep 04 19:45:23 kernel:  ? drm_mode_setplane+0x2a0/0x2a0 [drm]
Sep 04 19:45:23 kernel:  drm_mode_cursor_ioctl+0x4d/0x70 [drm]
Sep 04 19:45:23 kernel:  drm_ioctl_kernel+0xaa/0xf0 [drm]
Sep 04 19:45:23 kernel:  drm_ioctl+0x208/0x390 [drm]
Sep 04 19:45:23 kernel:  ? drm_mode_setplane+0x2a0/0x2a0 [drm]
Sep 04 19:45:23 kernel:  amdgpu_drm_ioctl+0x49/0x80 [amdgpu]
Sep 04 19:45:23 kernel:  do_vfs_ioctl+0x405/0x660
Sep 04 19:45:23 kernel:  ksys_ioctl+0x5e/0x90
Sep 04 19:45:23 kernel:  ? ksys_read+0xc4/0xe0
Sep 04 19:45:23 kernel:  __x64_sys_ioctl+0x16/0x20
Sep 04 19:45:23 kernel:  do_syscall_64+0x5f/0x1a0
Sep 04 19:45:23 kernel:  ? page_fault+0x8/0x30
Sep 04 19:45:23 kernel:  entry_SYSCALL_64_after_hwframe+0x44/0xa9
Sep 04 19:45:23 kernel: RIP: 0033:0x7fc4f687e1fb
Sep 04 19:45:23 kernel: Code: 0f 1e fa 48 8b 05 8d dc 0c 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 5d dc 0c 00 f7 d8 64 89 01 48
Sep 04 19:45:23 kernel: RSP: 002b:00007fc4cec492e8 EFLAGS: 00003246 ORIG_RAX: 0000000000000010
Sep 04 19:45:23 kernel: RAX: ffffffffffffffda RBX: 00007fc4cec49320 RCX: 00007fc4f687e1fb
Sep 04 19:45:23 kernel: RDX: 00007fc4cec49320 RSI: 00000000c01c64a3 RDI: 0000000000000010
Sep 04 19:45:23 kernel: RBP: 00000000c01c64a3 R08: 0000000000000276 R09: 0000000000000001
Sep 04 19:45:23 kernel: R10: 0000000000000000 R11: 0000000000003246 R12: 00005591448cec60
Sep 04 19:45:23 kernel: R13: 0000000000000010 R14: 000000000000027a R15: 0000000000000155
Sep 04 19:45:23 kernel: ---[ end trace 5a51309b874ce6f0 ]---
Sep 04 19:45:23 kernel: [drm] pstate TEST_DEBUG_DATA: 0x3FF60000
Sep 04 19:45:23 kernel: ------------[ cut here ]------------