changed /etc/default/grub and attached.
Also attached /var/log/dmesg

The external display does not turn on at boot but by requesting different
"Display" GUI settings the dock is rebooted (Ethernet connection is stopped
and started) and then sometimes the external display is started but usually
with incorrect settings such as wrong aspect ratios and mirrored instead of
separate.
Also, the mouse (not attached to the dock) becomes unresponsive for several
seconds at a time.
-- John


On Tue, Dec 29, 2020 at 8:34 AM John Dunlap <email address hidden> wrote:

> A while back that was some work-around.  I'll run it without.  Anything
> else?
>
> On Tue, Dec 29, 2020 at 2:30 AM koba <email address hidden> wrote:
>
>> @John,
>> why do you disable enable_dp_mst?
>>
>> --
>> 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
>>
>