Backtrace

WARNING: CPU: 2 PID: 27489 at drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link.c:2546 dc_link_set_backlight_level+0x8a/0xf0 [amdgpu]
Modules linked in: vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) veth rfcomm xt_nat xt_MASQUERADE nf_conntrack_netlink xt_addrtype br_netfilter bridge stp llc ccm nf_conntrack_netbios_ns nf_conntrack_broadcast xt_CT ip6t_REJECT nf_reject_ipv6 ip6t_rpfilter ipt_REJECT nf_reject_ipv4 xt_conntrack ebtable_nat ebtable_broute 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 overlay ip_set nfnetlink ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter cmac bnep sunrpc vfat fat uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_common rtsx_usb_ms memstick videodev mc ath9k ath9k_common ath9k_hw mac80211 edac_mce_amd kvm_amd ath ath3k cfg80211 btusb btrtl btbcm btintel bluetooth libarc4 ecdh_generic ecc ccp kvm irqbypass dell_laptop dell_wmi dell_smbios joydev dcdbas snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio dell_smm_hwmon
 snd_hda_codec_hdmi snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hda_core snd_hwdep snd_seq crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_seq_device wmi_bmof snd_pcm snd_timer dell_wmi_descriptor sparse_keymap snd dell_rbtn soundcore sp5100_tco i2c_piix4 fam15h_power k10temp acpi_cpufreq ip_tables rfkill amdgpu rtsx_usb_sdmmc hid_multitouch hid_logitech_hidpp iommu_v2 gpu_sched i2c_algo_bit rtsx_usb ttm crc32c_intel sdhci_pci cqhci drm_kms_helper serio_raw sdhci mmc_core cec uas drm usb_storage r8169 wmi video i2c_hid pinctrl_amd hid_logitech_dj fuse
CPU: 2 PID: 27489 Comm: systemd-sleep Tainted: G           OE     5.8.18-100.fc31.x86_64 #1
Hardware name: Dell Inc. Inspiron 5565/0RVKF9, BIOS 1.1.1 07/17/2017
RIP: 0010:dc_link_set_backlight_level+0x8a/0xf0 [amdgpu]
Code: 30 03 00 00 31 c0 48 8d 96 c0 01 00 00 48 8b 0a 48 85 c9 74 06 48 3b 59 08 74 20 83 c0 01 48 81 c2 c8 04 00 00 83 f8 06 75 e3 <0f> 0b 45 31 e4 5b 44 89 e0 5d 41 5c 41 5d 41 5e c3 48 98 48 69 c0
RSP: 0018:ffffbb61802efcb8 EFLAGS: 00010246
RAX: 0000000000000006 RBX: ffff9057c8640000 RCX: 0000000000000000
RDX: ffff905655c41e70 RSI: ffff905655c40000 RDI: 0000000000000004
RBP: ffff9057c41b0000 R08: 0000000000000000 R09: ffff9057c5845968
R10: ffff9057d189ce10 R11: ffff9057d3caa370 R12: 000000000000ff01
R13: 0000000000000000 R14: 000000000000ffff R15: 0000000000000002
FS:  00007fb72725c940(0000) GS:ffff9057d3d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7c2c016cd0 CR3: 0000000149d7c000 CR4: 00000000001406e0
Call Trace:
 amdgpu_dm_backlight_update_status+0xb1/0xc0 [amdgpu]
 backlight_suspend+0x6a/0x80
 ? backlight_resume+0x80/0x80
 dpm_run_callback+0x4f/0x140
 __device_suspend+0x11c/0x4a0
 dpm_suspend+0x117/0x250
 dpm_suspend_start+0x77/0x80
 suspend_devices_and_enter+0xe6/0x7d0
 pm_suspend.cold+0x333/0x386
 state_store+0x71/0xd0
 kernfs_fop_write+0xce/0x1b0
 vfs_write+0xc7/0x1f0
 ksys_write+0x4f/0xc0
 do_syscall_64+0x4d/0x90
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7fb727649467
Code: 64 89 02 48 c7 c0 ff ff ff ff eb bb 0f 1f 80 00 00 00 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24
RSP: 002b:00007ffc8df8b508 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007fb727649467
RDX: 0000000000000004 RSI: 00007ffc8df8b5f0 RDI: 0000000000000004
RBP: 00007ffc8df8b5f0 R08: 0000000000000000 R09: 0000558e92911ee0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 0000558e9290f2f0 R14: 0000000000000004 R15: 00007fb72771a700