Thinkpad x220 - Unable to use 2560x1440 external display connected via DisplayPort due flashing black screen
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Won't Fix
|
Medium
|
Unassigned | ||
mutter (Ubuntu) |
Won't Fix
|
Undecided
|
Unassigned |
Bug Description
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/
The same hardware combination works fine in Windows 10.
ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: xorg 1:7.7+19ubuntu8
ProcVersionSign
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
ExtraDebuggingI
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_
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=
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.
dmi.board.name: 42872WU
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.
dmi.modalias: dmi:bvnLENOVO:
dmi.product.family: ThinkPad X220
dmi.product.name: 42872WU
dmi.product.
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.13.
version.libdrm2: libdrm2 2.4.95-1
version.
version.
version.
version.
version.
version.
version.
Can you please try logging into "Ubuntu on Wayland" and tell us if that has the same problem?