I suppose these .deb files are the ones you'd like me to try:

-rw-rw-r-- 1 dunlap dunlap 11476820 2020-12-27 18:19
linux-headers-5.10.0-051000drmtip20201228_5.10.0-051000drmtip20201228.202012280203_all.deb
-rw-rw-r-- 1 dunlap dunlap  1248336 2020-12-27 18:22
linux-headers-5.10.0-051000drmtip20201228-generic_5.10.0-051000drmtip20201228.202012280203_amd64.deb
-rw-rw-r-- 1 dunlap dunlap 10981324 2020-12-27 18:21
linux-image-unsigned-5.10.0-051000drmtip20201228-generic_5.10.0-051000drmtip20201228.202012280203_amd64.deb
-rw-rw-r-- 1 dunlap dunlap 56164620 2020-12-27 18:21
linux-modules-5.10.0-051000drmtip20201228-generic_5.10.0-051000drmtip20201228.202012280203_amd64.deb

I'll install them and try drm.debug=0x11e log_buf_len=16M in grub

On Mon, Dec 28, 2020 at 10:55 PM koba <email address hidden> wrote:

> @John, if you're free, Would you please help to try drm-tip?
> You cound just download the files with "generic" and
> linux_header_***_all.deb
> https://kernel.ubuntu.com/~kernel-ppa/mainline/drm-tip/2020-12-28/
>
> And enable drm.debug=0x11e log_buf_len=16M in grub.
>
> If the issue still exist, please upload the dmesg
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1899882
>
> Title:
>   hdmi monitor on
>
> Status in linux package in Ubuntu:
>   Fix Committed
>
> Bug description:
>   XPS 13 9300 -- 50H3P53 -- Dell laptop
>   WD19TB ------- 4BWNW43 -- Dell Thunderbolt dock
>   S2319HS ------ B4TYZ13 -- Dell 23" external monitor
>
>   External monitor remains black when waking system after suspending.
>   Works OK when log out then log in or when reboot.
>   Using HDMI cable from dock to monitor.
>
>   From /var/log/syslog:
>
>   Oct 14 21:09:41 lt9 kernel: [32059.746520] ------------[ cut here
> ]------------
>   Oct 14 21:09:41 lt9 kernel: [32059.746524] WARN_ON(is_mst && (port ==
> PORT_A || port == PORT_E))
>   Oct 14 21:09:41 lt9 kernel: [32059.746674] WARNING: CPU: 6 PID: 1221 at
> drivers/gpu/drm/i915/display/intel_ddi.c:3179
> intel_ddi_pre_enable_dp.isra.0+0x20f/0x430 [i915]
>   Oct 14 21:09:41 lt9 kernel: [32059.746676] Modules linked in: ccm usblp
> ftdi_sio usbserial snd_usb_audio snd_usbmidi_lib rfcomm typec_displayport
> cdc_ether usbnet r8152 mii cmac algif_hash algif_skcipher af_al
>   g bnep btusb btrtl btbcm btintel uvcvideo videobuf2_vmalloc
> videobuf2_memops bluetooth videobuf2_v4l2 videobuf2_common videodev mc
> ecdh_generic ecc nls_iso8859_1 snd_sof_pci snd_sof_intel_hda_common
> snd_soc_hd
>   ac_hda snd_hda_codec_hdmi snd_sof_intel_hda snd_sof_intel_byt
> snd_sof_intel_ipc snd_sof snd_sof_xtensa_dsp snd_hda_ext_core
> snd_soc_acpi_intel_match snd_soc_acpi snd_soc_core snd_compress
> snd_hda_codec_realtek
>    ac97_bus snd_pcm_dmaengine snd_hda_codec_generic snd_hda_intel mei_hdcp
> snd_intel_dspcfg dell_laptop snd_hda_codec joydev ledtrig_audio
> intel_rapl_msr snd_hda_core snd_hwdep x86_pkg_temp_thermal intel_powercl
>   amp snd_pcm coretemp kvm_intel kvm snd_seq_midi snd_seq_midi_event
> snd_rawmidi crct10dif_pclmul ghash_clmulni_intel dell_wmi snd_seq
> aesni_intel dell_smbios crypto_simd dcdbas cryptd glue_helper rapl
>   Oct 14 21:09:41 lt9 kernel: [32059.746719]  intel_cstate iwlmvm
> input_leds serio_raw mac80211 snd_seq_device intel_wmi_thunderbolt wmi_bmof
> dell_wmi_descriptor snd_timer libarc4 snd hid_sensor_als hid_sensor_t
>   rigger industrialio_triggered_buffer iwlwifi kfifo_buf
> hid_sensor_iio_common rtsx_pci_ms 8250_dw memstick soundcore industrialio
> ucsi_acpi processor_thermal_device intel_rapl_common mei_me typec_ucsi
> cros_ec_i
>   shtp hid_multitouch mei cfg80211 cros_ec intel_soc_dts_iosf typec
> int3403_thermal mac_hid int340x_thermal_zone int3400_thermal intel_hid
> acpi_thermal_rel sparse_keymap acpi_pad acpi_tad sch_fq_codel parport_pc
>    ppdev lp parport ip_tables x_tables autofs4 btrfs zstd_compress usbhid
> raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx
> xor raid6_pq libcrc32c raid1 raid0 multipath linear hid_sensor_
>   hub hid_generic intel_ishtp_loader intel_ishtp_hid rtsx_pci_sdmmc i915
> crc32_pclmul rtsx_pci psmouse nvme i2c_algo_bit drm_kms_helper
> intel_lpss_pci i2c_i801 intel_lpss nvme_core syscopyarea idma64
>   Oct 14 21:09:41 lt9 kernel: [32059.746764]  sysfillrect virt_dma
> sysimgblt fb_sys_fops intel_ish_ipc thunderbolt drm intel_ishtp wmi i2c_hid
> hid video pinctrl_icelake pinctrl_intel
>   Oct 14 21:09:41 lt9 kernel: [32059.746778] CPU: 6 PID: 1221 Comm: Xorg
> Tainted: G        W         5.4.0-48-generic #52-Ubuntu
>   Oct 14 21:09:41 lt9 kernel: [32059.746780] Hardware name: Dell Inc. XPS
> 13 9300/0RMFN5, BIOS 1.2.0 08/13/2020
>   Oct 14 21:09:41 lt9 kernel: [32059.746843] RIP:
> 0010:intel_ddi_pre_enable_dp.isra.0+0x20f/0x430 [i915]
>   Oct 14 21:09:41 lt9 kernel: [32059.746847] Code: ff ff 83 f8 0a bf 00 00
> 00 00 49 0f 44 fc 48 89 7d c0 e9 4b fe ff ff 48 c7 c6 e0 0a 76 c0 48 c7 c7
> 43 79 77 c0 e8 0c c5 bd db <0f> 0b e9 ae fe ff ff 41 8b 54 24 70 8b 75 a8
> 4c 89 e7 e8 8a c7 ff
>   Oct 14 21:09:41 lt9 kernel: [32059.746849] RSP: 0018:ffffb3bf01253850
> EFLAGS: 00010282
>   Oct 14 21:09:41 lt9 kernel: [32059.746852] RAX: 0000000000000000 RBX:
> ffff9f1eebeca000 RCX: 0000000000000000
>   Oct 14 21:09:41 lt9 kernel: [32059.746854] RDX: 0000000000000035 RSI:
> ffffffff9dd955d5 RDI: 0000000000000246
>   Oct 14 21:09:41 lt9 kernel: [32059.746855] RBP: ffffb3bf012538a8 R08:
> ffffffff9dd955a0 R09: 0000000000000035
>   Oct 14 21:09:41 lt9 kernel: [32059.746857] R10: ffffffff9dd95980 R11:
> 000000009dd9559f R12: ffff9f1eebeca000
>   Oct 14 21:09:41 lt9 kernel: [32059.746858] R13: ffff9f1e1bb67000 R14:
> ffff9f1eebb80000 R15: ffff9f1eebeca120
>   Oct 14 21:09:41 lt9 kernel: [32059.746861] FS:  00007fd341ab0a80(0000)
> GS:ffff9f1eff780000(0000) knlGS:0000000000000000
>   Oct 14 21:09:41 lt9 kernel: [32059.746863] CS:  0010 DS: 0000 ES: 0000
> CR0: 0000000080050033
>   Oct 14 21:09:41 lt9 kernel: [32059.746865] CR2: 00000177088fa000 CR3:
> 000000046e046003 CR4: 0000000000760ee0
>   Oct 14 21:09:41 lt9 kernel: [32059.746866] PKRU: 55555554
>   Oct 14 21:09:41 lt9 kernel: [32059.746868] Call Trace:
>   Oct 14 21:09:41 lt9 kernel: [32059.746930]  ?
> intel_set_cpu_fifo_underrun_reporting+0x89/0x2a0 [i915]
>   Oct 14 21:09:41 lt9 kernel: [32059.746984]
> intel_ddi_pre_enable+0x98/0x340 [i915]
>   Oct 14 21:09:41 lt9 kernel: [32059.747000]  ?
> drm_dp_mst_topology_put_port+0x27/0x40 [drm_kms_helper]
>   Oct 14 21:09:41 lt9 kernel: [32059.747053]
> intel_mst_pre_enable_dp+0x9a/0x150 [i915]
>   Oct 14 21:09:41 lt9 kernel: [32059.747109]
> intel_encoders_pre_enable.isra.0+0x6b/0x80 [i915]
>   Oct 14 21:09:41 lt9 kernel: [32059.747163]
> haswell_crtc_enable+0x84/0x450 [i915]
>   Oct 14 21:09:41 lt9 kernel: [32059.747232]  ?
> intel_pipe_update_end+0x85/0x1b0 [i915]
>   Oct 14 21:09:41 lt9 kernel: [32059.747302]
> intel_update_crtc+0x35e/0x3e0 [i915]
>   Oct 14 21:09:41 lt9 kernel: [32059.747368]  skl_update_crtcs+0x24f/0x2c0
> [i915]
>   Oct 14 21:09:41 lt9 kernel: [32059.747436]
> intel_atomic_commit_tail+0x3eb/0x12e0 [i915]
>   Oct 14 21:09:41 lt9 kernel: [32059.747442]  ?
> flush_workqueue_prep_pwqs+0x12e/0x140
>   Oct 14 21:09:41 lt9 kernel: [32059.747447]  ? flush_workqueue+0x193/0x420
>   Oct 14 21:09:41 lt9 kernel: [32059.747514]  ?
> intel_atomic_commit_ready+0x4d/0x54 [i915]
>   Oct 14 21:09:41 lt9 kernel: [32059.747580]
> intel_atomic_commit+0x284/0x2b0 [i915]
>   Oct 14 21:09:41 lt9 kernel: [32059.747615]  drm_atomic_commit+0x4a/0x50
> [drm]
>   Oct 14 21:09:41 lt9 kernel: [32059.747636]
> drm_atomic_connector_commit_dpms+0xdf/0x100 [drm]
>   Oct 14 21:09:41 lt9 kernel: [32059.747660]
> drm_mode_obj_set_property_ioctl+0x156/0x2a0 [drm]
>   Oct 14 21:09:41 lt9 kernel: [32059.747684]  ?
> drm_connector_set_obj_prop+0x90/0x90 [drm]
>   Oct 14 21:09:41 lt9 kernel: [32059.747705]
> drm_connector_property_set_ioctl+0x3b/0x60 [drm]
>   Oct 14 21:09:41 lt9 kernel: [32059.747722]  drm_ioctl_kernel+0xae/0xf0
> [drm]
>   Oct 14 21:09:41 lt9 kernel: [32059.747739]  drm_ioctl+0x234/0x3d0 [drm]
>   Oct 14 21:09:41 lt9 kernel: [32059.747758]  ?
> drm_connector_set_obj_prop+0x90/0x90 [drm]
>   Oct 14 21:09:41 lt9 kernel: [32059.747764]  ? __switch_to_asm+0x40/0x70
>   Oct 14 21:09:41 lt9 kernel: [32059.747767]  ? __switch_to_asm+0x34/0x70
>   Oct 14 21:09:41 lt9 kernel: [32059.747769]  ? __switch_to_asm+0x40/0x70
>   Oct 14 21:09:41 lt9 kernel: [32059.747772]  ? __switch_to_asm+0x34/0x70
>   Oct 14 21:09:41 lt9 kernel: [32059.747775]  ? __switch_to_asm+0x40/0x70
>   Oct 14 21:09:41 lt9 kernel: [32059.747777]  ? __switch_to_asm+0x34/0x70
>   Oct 14 21:09:41 lt9 kernel: [32059.747780]  ? __switch_to_asm+0x40/0x70
>   Oct 14 21:09:41 lt9 kernel: [32059.747782]  ? __switch_to_asm+0x34/0x70
>   Oct 14 21:09:41 lt9 kernel: [32059.747785]  ? __switch_to_asm+0x40/0x70
>   Oct 14 21:09:41 lt9 kernel: [32059.747787]  ? __switch_to_asm+0x34/0x70
>   Oct 14 21:09:41 lt9 kernel: [32059.747790]  ? __switch_to_asm+0x40/0x70
>   Oct 14 21:09:41 lt9 kernel: [32059.747794]  ? __switch_to+0x1b2/0x470
>   Oct 14 21:09:41 lt9 kernel: [32059.747799]  do_vfs_ioctl+0x407/0x670
>   Oct 14 21:09:41 lt9 kernel: [32059.747801]  ? __schedule+0x2eb/0x740
>   Oct 14 21:09:41 lt9 kernel: [32059.747804]  ksys_ioctl+0x67/0x90
>   Oct 14 21:09:41 lt9 kernel: [32059.747807]  __x64_sys_ioctl+0x1a/0x20
>   Oct 14 21:09:41 lt9 kernel: [32059.747811]  do_syscall_64+0x57/0x190
>   Oct 14 21:09:41 lt9 kernel: [32059.747815]
> entry_SYSCALL_64_after_hwframe+0x44/0xa9
>   Oct 14 21:09:41 lt9 kernel: [32059.747817] RIP: 0033:0x7fd341e1050b
>   Oct 14 21:09:41 lt9 kernel: [32059.747821] Code: 0f 1e fa 48 8b 05 85 39
> 0d 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 55 39 0d
> 00 f7 d8 64 89 01 48
>   Oct 14 21:09:41 lt9 kernel: [32059.747822] RSP: 002b:00007ffdbeeafca8
> EFLAGS: 00000246 ORIG_RAX: 0000000000000010
>   Oct 14 21:09:41 lt9 kernel: [32059.747825] RAX: ffffffffffffffda RBX:
> 00007ffdbeeafce0 RCX: 00007fd341e1050b
>   Oct 14 21:09:41 lt9 kernel: [32059.747826] RDX: 00007ffdbeeafce0 RSI:
> 00000000c01064ab RDI: 000000000000000e
>   Oct 14 21:09:41 lt9 kernel: [32059.747827] RBP: 00000000c01064ab R08:
> 000055884cdb3060 R09: 0000000000000000
>   Oct 14 21:09:41 lt9 kernel: [32059.747828] R10: 000055884cdb3060 R11:
> 0000000000000246 R12: 000055884db5ac70
>   Oct 14 21:09:41 lt9 kernel: [32059.747830] R13: 000000000000000e R14:
> 000055884cdb2a20 R15: 000055884ca02138
>   Oct 14 21:09:41 lt9 kernel: [32059.747833] ---[ end trace
> 21c6e0ef255ea00b ]---
>
>   ProblemType: Bug
>   DistroRelease: Ubuntu 20.04
>   Package: linux-image-5.4.0-48-generic 5.4.0-48.52
>   ProcVersionSignature: Ubuntu 5.4.0-48.52-generic 5.4.60
>   Uname: Linux 5.4.0-48-generic x86_64
>   ApportVersion: 2.20.11-0ubuntu27.8
>   Architecture: amd64
>   AudioDevicesInUse:
>    USER        PID ACCESS COMMAND
>    /dev/snd/controlC1:  dunlap     2447 F.... pulseaudio
>    /dev/snd/controlC0:  dunlap     2447 F.... pulseaudio
>   CasperMD5CheckResult: skip
>   CurrentDesktop: XFCE
>   Date: Wed Oct 14 21:44:32 2020
>   DistributionChannelDescriptor:
>    # This is the distribution channel descriptor for the OEM CDs
>    # For more information see
> http://wiki.ubuntu.com/DistributionChannelDescriptor
>    canonical-oem-somerville-focal-amd64-20200502-85
>   InstallationDate: Installed on 2020-08-04 (71 days ago)
>   InstallationMedia: Ubuntu 20.04 "Focal" - Build amd64 LIVE Binary
> 20200502-05:58
>   MachineType: Dell Inc. XPS 13 9300
>   ProcFB: 0 i915drmfb
>   ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-48-generic
> root=UUID=2d9ccdcb-a33b-4e1c-be69-0390b3405c08 ro quiet splash vt.handoff=7
>   RelatedPackageVersions:
>    linux-restricted-modules-5.4.0-48-generic N/A
>    linux-backports-modules-5.4.0-48-generic  N/A
>    linux-firmware                            1.187.3
>   SourcePackage: linux
>   UpgradeStatus: No upgrade log present (probably fresh install)
>   dmi.bios.date: 08/13/2020
>   dmi.bios.vendor: Dell Inc.
>   dmi.bios.version: 1.2.0
>   dmi.board.name: 0RMFN5
>   dmi.board.vendor: Dell Inc.
>   dmi.board.version: A00
>   dmi.chassis.type: 10
>   dmi.chassis.vendor: Dell Inc.
>   dmi.modalias:
> dmi:bvnDellInc.:bvr1.2.0:bd08/13/2020:svnDellInc.:pnXPS139300:pvr:rvnDellInc.:rn0RMFN5:rvrA00:cvnDellInc.:ct10:cvr:
>   dmi.product.family: XPS
>   dmi.product.name: XPS 13 9300
>   dmi.product.sku: 096D
>   dmi.sys.vendor: Dell Inc.
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1899882/+subscriptions
>