Public bug reported:
I have a fresh install of 18.10 on an old Thinkpad x220. Everything
works fine with the internal display or an external Dell G2410
(1920x1080) connected via VGA. But when I try to switch to an external
BenQ PD2710QC (2560x1440) I only see the screen for a few seconds at a
time and then it flashes to black. This happens consistently for minutes
--it never "settles down".
I've tried the default configuration as well as copying xorg.conf from
/usr/share/doc/xserver-xorg-video-intel into /etc/x11. I've tried both
xorg configurations with nomodeset in the bootloader and without. I have
not been able to find any configuration that allows this external
DisplayPort display to work.
The same hardware combination works fine in Windows 10.
ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: xorg 1:7.7+19ubuntu8
ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
Uname: Linux 4.18.0-10-generic x86_64
ApportVersion: 2.20.10-0ubuntu13
Architecture: amd64
Date: Fri Nov 9 13:10:59 2018
DistUpgraded: Fresh install
DistroCodename: cosmic
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
Intel Corporation 2nd Generation Core Processor Family Integrated Graphics
Controller [8086:0126] (rev 09) (prog-if 00 [VGA controller])
Subsystem: Lenovo 2nd Generation Core Processor Family Integrated Graphics
Controller [17aa:21da]
InstallationDate: Installed on 2018-11-09 (0 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
MachineType: LENOVO 42872WU
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-10-generic
root=UUID=cd4f21be-48dd-48e7-b289-a59a32bd0be3 ro quiet splash nomodeset
vt.handoff=1
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
XorgConf:
Section "Device"
Identifier "Intel"
Driver "intel"
# Option "AccelMethod" "uxa"
EndSection
dmi.bios.date: 06/21/2018
dmi.bios.vendor: LENOVO
dmi.bios.version: 8DET76WW (1.46 )
dmi.board.asset.tag: Not Available
dmi.board.name: 42872WU
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias:
dmi:bvnLENOVO:bvr8DET76WW(1.46):bd06/21/2018:svnLENOVO:pn42872WU:pvrThinkPadX220:rvnLENOVO:rn42872WU:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.family: ThinkPad X220
dmi.product.name: 42872WU
dmi.product.version: ThinkPad X220
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.13.1+18.10.20180930-0ubuntu1
version.libdrm2: libdrm2 2.4.95-1
version.libgl1-mesa-dri: libgl1-mesa-dri 18.2.2-0ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.1-3ubuntu2.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20171229-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-3
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug cosmic ubuntu
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https://bugs.launchpad.net/bugs/1802573
Title:
Thinkpad x220 - Unable to use 2560x1440 external display connected via
DisplayPort due flashing black screen
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