Public bug reported:
I have some early dell 4k 60hz screens - the ones which report 2 panels
internally for DP 60Hz - horrid hack I know; I recently got a new XPS
laptop and put Ubuntu on it.
That XPS laptop has two USB-C/thunderbolt ports, so to drive the screens
I bought two slightly different DP adapters - one with power
passthrough, and a cheaper one that only does DP.
The more expensive one 'USB-C to HDMI/DP' drives the monitor happily
over DP, though sadly only at 30Hz - can't have everything :/. It
reports one monitor as one output: DP-1 in the attached information:
DP-1 connected 3840x2160+0+0 (normal left inverted right x axis y axis) 527mm x
296mm
3840x2160 29.98*+ 30.00 29.97
1920x1200 59.88
...
The cheaper one reports the single monitor as two distinct outputs, at 60hz
interestingly -
DP-3-8 connected (normal left inverted right x axis y axis)
1920x2160 59.99 +
DP-3-9 connected 1920x2160+7680+0 (normal left inverted right x axis y axis)
527mm x 296mm
1920x2160 59.99*+
1920x1200 59.88
which in theory if summed together would be one whole screen. But
attempting to configure the output results in an error:
xrandr --output DP-1 --auto --left-of eDP-1 --output DP-3-9 --auto --right-of
DP-3-8 --output DP-3-8 --auto --right-of eDP-1
xrandr: cannot find crtc for output DP-3-8
I'm not sure if this is an intrinsic limitation of the USB-C->DP dongle,
or whether there is something that can be done in the software to deal
with this 10 year old hardware hack I have sitting on my desktop.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-40.44-generic 5.4.44
Uname: Linux 5.4.0-40-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.3
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Wed Jul 8 11:20:17 2020
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
Intel Corporation Iris Plus Graphics G7 [8086:8a52] (rev 07) (prog-if 00 [VGA
controller])
Subsystem: Dell Iris Plus Graphics G7 [1028:096d]
InstallationDate: Installed on 2020-07-07 (0 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
MachineType: Dell Inc. XPS 13 9300
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-40-generic
root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/08/2020
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.0.11
dmi.board.name: 0WX9VX
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr1.0.11:bd05/08/2020:svnDellInc.:pnXPS139300:pvr:rvnDellInc.:rn0WX9VX:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 13 9300
dmi.product.sku: 096D
dmi.sys.vendor: Dell Inc.
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.101-2
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.8-0ubuntu1~20.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20200226-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal ubuntu
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https://bugs.launchpad.net/bugs/1886729
Title:
Dell displayport YJ3Y6 adapter doesn't drive 4K screen properly
Status in xorg package in Ubuntu:
New
Bug description:
I have some early dell 4k 60hz screens - the ones which report 2
panels internally for DP 60Hz - horrid hack I know; I recently got a
new XPS laptop and put Ubuntu on it.
That XPS laptop has two USB-C/thunderbolt ports, so to drive the
screens I bought two slightly different DP adapters - one with power
passthrough, and a cheaper one that only does DP.
The more expensive one 'USB-C to HDMI/DP' drives the monitor happily
over DP, though sadly only at 30Hz - can't have everything :/. It
reports one monitor as one output: DP-1 in the attached information:
DP-1 connected 3840x2160+0+0 (normal left inverted right x axis y axis) 527mm
x 296mm
3840x2160 29.98*+ 30.00 29.97
1920x1200 59.88
...
The cheaper one reports the single monitor as two distinct outputs, at 60hz
interestingly -
DP-3-8 connected (normal left inverted right x axis y axis)
1920x2160 59.99 +
DP-3-9 connected 1920x2160+7680+0 (normal left inverted right x axis y axis)
527mm x 296mm
1920x2160 59.99*+
1920x1200 59.88
which in theory if summed together would be one whole screen. But
attempting to configure the output results in an error:
xrandr --output DP-1 --auto --left-of eDP-1 --output DP-3-9 --auto --right-of
DP-3-8 --output DP-3-8 --auto --right-of eDP-1
xrandr: cannot find crtc for output DP-3-8
I'm not sure if this is an intrinsic limitation of the USB-C->DP
dongle, or whether there is something that can be done in the software
to deal with this 10 year old hardware hack I have sitting on my
desktop.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-40.44-generic 5.4.44
Uname: Linux 5.4.0-40-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.3
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Wed Jul 8 11:20:17 2020
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
Intel Corporation Iris Plus Graphics G7 [8086:8a52] (rev 07) (prog-if 00
[VGA controller])
Subsystem: Dell Iris Plus Graphics G7 [1028:096d]
InstallationDate: Installed on 2020-07-07 (0 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
MachineType: Dell Inc. XPS 13 9300
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-40-generic
root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/08/2020
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.0.11
dmi.board.name: 0WX9VX
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr1.0.11:bd05/08/2020:svnDellInc.:pnXPS139300:pvr:rvnDellInc.:rn0WX9VX:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 13 9300
dmi.product.sku: 096D
dmi.sys.vendor: Dell Inc.
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.101-2
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.8-0ubuntu1~20.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20200226-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1
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