You have been subscribed to a public bug:
upgrading to latest packages, my setup with 3 displays (internal plus 2
external, plugged into Lenovo USB-c base station) no longer works.
the Settings -> Displays app does find all displays, but the system only
displays on the internal one. Attempting to enable all displays fails,
the third disappears from view in the Displays app just before it
presents the "Keep settings" dialog. However no output appears on any of
the external displays other than the display's own firmware messages.
ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: xorg 1:7.7+22ubuntu1
ProcVersionSignature: Ubuntu 5.11.0-31.33-generic 5.11.22
Uname: Linux 5.11.0-31-generic x86_64
ApportVersion: 2.20.11-0ubuntu65.1
Architecture: amd64
CasperMD5CheckResult: unknown
CompositorRunning: None
Date: Thu Sep 2 10:54:09 2021
DistUpgraded: 2021-06-14 13:24:54,764 DEBUG Running PostInstallScript:
'/usr/lib/ubuntu-advantage/upgrade_lts_contract.py'
DistroCodename: hirsute
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
Intel Corporation UHD Graphics 620 [8086:5917] (rev 07) (prog-if 00 [VGA
controller])
Subsystem: Lenovo UHD Graphics 620 [17aa:225d]
InstallationDate: Installed on 2020-08-13 (384 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
MachineType: LENOVO 20L6S30S00
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.11.0-31-generic
root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: Upgraded to hirsute on 2021-06-14 (79 days ago)
dmi.bios.date: 08/10/2020
dmi.bios.release: 1.35
dmi.bios.vendor: LENOVO
dmi.bios.version: N24ET60W (1.35 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20L6S30S00
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40697 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.20
dmi.modalias:
dmi:bvnLENOVO:bvrN24ET60W(1.35):bd08/10/2020:br1.35:efr1.20:svnLENOVO:pn20L6S30S00:pvrThinkPadT480:rvnLENOVO:rn20L6S30S00:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad T480
dmi.product.name: 20L6S30S00
dmi.product.sku: LENOVO_MT_20L6_BU_Think_FM_ThinkPad T480
dmi.product.version: ThinkPad T480
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.105-3~21.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 21.0.3-0ubuntu0.3
version.libgl1-mesa-glx: libgl1-mesa-glx 21.0.3-0ubuntu0.3
version.xserver-xorg-core: xserver-xorg-core 2:1.20.11-1ubuntu1.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-2
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20200714-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.17-1
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug hirsute ubuntu
--
[Lenovo Thunderbolt 3 Dock] Upgrade to 5.11.0-31-generic #33 breaks use of
external displays with i915
https://bugs.launchpad.net/bugs/1942427
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