My monitor is EDID 1.3 and it has the same problem.
edid-decode (hex):
00 ff ff ff ff ff ff 00 41 0c 8f c1 bd 07 00 00
08 1d 01 03 80 3c 22 78 2a 67 a1 a5 55 4d a2 27
0e 50 54 bf ef 00 d1 c0 b3 00 95 00 81 80 81 40
81 c0 01 01 01 01 4d d0 00 a0 f0 70 3e 80 30 20
35 00 55 50 21 00 00 1a a3 66 00 a0 f0 70 1f 80
30 20 35 00 55 50 21 00 00 1a 00 00 00 fc 00 50
48 4c 20 32 37 36 45 38 56 0a 20 20 00 00 00 fd
00 17 50 1e a0 3c 00 0a 20 20 20 20 20 20 01 72
02 03 33 f1 4c 90 04 03 1f 13 01 12 5d 5e 5f 60
61 23 09 07 07 83 01 00 00 6d 03 0c 00 10 00 38
78 20 00 60 01 02 03 67 d8 5d c4 01 78 80 03 e3
0f 00 0c 56 5e 00 a0 a0 a0 29 50 30 20 35 00 55
50 21 00 00 1e 02 3a 80 18 71 38 2d 40 58 2c 45
00 55 50 21 00 00 1e 01 1d 00 72 51 d0 1e 20 6e
28 55 00 55 50 21 00 00 1e 4d 6c 80 a0 70 70 3e
80 30 20 3a 00 55 50 21 00 00 1a 00 00 00 00 4e
----------------
EDID version: 1.3
Manufacturer: PHL Model 49551 Serial Number 1981
Made in week 8 of 2019
Digital display
Maximum image size: 60 cm x 34 cm
Gamma: 2.20
DPMS levels: Off
RGB color display
First detailed timing is preferred timing
Color Characteristics
Red: 0.6455, 0.3339
Green: 0.3017, 0.6357
Blue: 0.1542, 0.0566
White: 0.3125, 0.3291
Established Timings I & II
720x400 70.082 Hz 9:5 31.467 kHz 28.320 MHz (IBM)
640x480 59.940 Hz 4:3 31.469 kHz 25.175 MHz (DMT)
640x480 66.667 Hz 4:3 35.000 kHz 30.240 MHz (Apple)
640x480 72.809 Hz 4:3 37.861 kHz 31.500 MHz (DMT)
640x480 75.000 Hz 4:3 37.500 kHz 31.500 MHz (DMT)
800x600 56.250 Hz 4:3 35.156 kHz 36.000 MHz (DMT)
800x600 60.317 Hz 4:3 37.879 kHz 40.000 MHz (DMT)
800x600 72.188 Hz 4:3 48.077 kHz 50.000 MHz (DMT)
800x600 75.000 Hz 4:3 46.875 kHz 49.500 MHz (DMT)
832x624 74.551 Hz 4:3 49.726 kHz 57.284 MHz (Apple)
1024x768 60.004 Hz 4:3 48.363 kHz 65.000 MHz (DMT)
1024x768 70.069 Hz 4:3 56.476 kHz 75.000 MHz (DMT)
1024x768 75.029 Hz 4:3 60.023 kHz 78.750 MHz (DMT)
1280x1024 75.025 Hz 5:4 79.976 kHz 135.000 MHz (DMT)
Standard Timings
1920x1080 60.000 Hz 16:9 67.500 kHz 148.500 MHz (DMT)
1680x1050 59.954 Hz 16:10 65.290 kHz 146.250 MHz (DMT)
1440x900 59.887 Hz 16:10 55.935 kHz 106.500 MHz (DMT)
1280x1024 60.020 Hz 5:4 63.981 kHz 108.000 MHz (DMT)
1280x960 60.000 Hz 4:3 60.000 kHz 108.000 MHz (DMT)
1280x720 60.000 Hz 16:9 45.000 kHz 74.250 MHz (DMT)
Detailed mode: Clock 533.250 MHz, 597 mm x 336 mm
3840 3888 3920 4000 ( 48 32 80)
2160 2163 2168 2222 ( 3 5 54)
+hsync -vsync
VertFreq: 59.997 Hz, HorFreq: 133.312 kHz
Detailed mode: Clock 262.750 MHz, 597 mm x 336 mm
3840 3888 3920 4000 ( 48 32 80)
2160 2163 2168 2191 ( 3 5 23)
+hsync -vsync
VertFreq: 29.981 Hz, HorFreq: 65.688 kHz
Display Product Name: PHL 276E8V
Display Range Limits
Monitor ranges (GTF): 23-80 Hz V, 30-160 kHz H, max dotclock 600 MHz
Has 1 extension block
Checksum: 0x72
----------------
CTA-861 Extension Block Revision 3
Underscans PC formats by default
Basic audio support
Supports YCbCr 4:4:4
Supports YCbCr 4:2:2
1 native detailed modes
47 bytes of CTA data blocks
Video Data Block
1920x1080 60.000 Hz 16:9 67.500 kHz 148.500 MHz (VIC 16, native)
1280x720 60.000 Hz 16:9 45.000 kHz 74.250 MHz (VIC 4)
720x480 59.940 Hz 16:9 31.469 kHz 27.000 MHz (VIC 3)
1920x1080 50.000 Hz 16:9 56.250 kHz 148.500 MHz (VIC 31)
1280x720 50.000 Hz 16:9 37.500 kHz 74.250 MHz (VIC 19)
640x480 59.940 Hz 4:3 31.469 kHz 25.175 MHz (VIC 1)
720x576 50.000 Hz 16:9 31.250 kHz 27.000 MHz (VIC 18)
3840x2160 24.000 Hz 16:9 54.000 kHz 297.000 MHz (VIC 93)
3840x2160 25.000 Hz 16:9 56.250 kHz 297.000 MHz (VIC 94)
3840x2160 30.000 Hz 16:9 67.500 kHz 297.000 MHz (VIC 95)
3840x2160 50.000 Hz 16:9 112.500 kHz 594.000 MHz (VIC 96)
3840x2160 60.000 Hz 16:9 135.000 kHz 594.000 MHz (VIC 97)
Audio Data Block
Linear PCM, max channels 2
Supported sample rates (kHz): 48 44.1 32
Supported sample sizes (bits): 24 20 16
Speaker Allocation Data Block
Speaker map:
FL/FR - Front Left/Right
Vendor-Specific Data Block, OUI 0x000c03 (HDMI)
Source physical address 1.0.0.0
DC_36bit
DC_30bit
DC_Y444
Maximum TMDS clock: 600 MHz
Extended HDMI video details:
HDMI VICs:
3840x2160 30.000 Hz 16:9 67.500 kHz 297.000 MHz (HDMI VIC 1)
3840x2160 25.000 Hz 16:9 56.250 kHz 297.000 MHz (HDMI VIC 2)
3840x2160 24.000 Hz 16:9 54.000 kHz 297.000 MHz (HDMI VIC 3)
Vendor-Specific Data Block, OUI 0xc45dd8 (HDMI Forum)
Version: 1
Maximum TMDS Character Rate: 600 MHz
SCDC Present
Supports 12-bits/component Deep Color 4:2:0 Pixel Encoding
Supports 10-bits/component Deep Color 4:2:0 Pixel Encoding
Extended tag: YCbCr 4:2:0 Capability Map Data Block
3840x2160 50.000 Hz 16:9 112.500 kHz 594.000 MHz (VIC 96)
3840x2160 60.000 Hz 16:9 135.000 kHz 594.000 MHz (VIC 97)
Detailed mode: Clock 241.500 MHz, 597 mm x 336 mm
2560 2608 2640 2720 ( 48 32 80)
1440 1443 1448 1481 ( 3 5 33)
+hsync +vsync
VertFreq: 59.951 Hz, HorFreq: 88.787 kHz
Detailed mode: Clock 148.500 MHz, 597 mm x 336 mm
1920 2008 2052 2200 ( 88 44 148)
1080 1084 1089 1125 ( 4 5 36)
+hsync +vsync
VertFreq: 60.000 Hz, HorFreq: 67.500 kHz
Detailed mode: Clock 74.250 MHz, 597 mm x 336 mm
1280 1390 1430 1650 (110 40 220)
720 725 730 750 ( 5 5 20)
+hsync +vsync
VertFreq: 60.000 Hz, HorFreq: 45.000 kHz
Detailed mode: Clock 277.250 MHz, 597 mm x 336 mm
1920 1968 2000 2080 ( 48 32 80)
2160 2163 2173 2222 ( 3 10 49)
+hsync -vsync
VertFreq: 59.988 Hz, HorFreq: 133.293 kHz
Checksum: 0x4e
** Attachment added: "edid"
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1890772/+attachment/5399498/+files/edid
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https://bugs.launchpad.net/bugs/1890772
Title:
Some external 4K monitor is not working properly
Status in OEM Priority Project:
New
Status in linux package in Ubuntu:
Confirmed
Status in mutter package in Ubuntu:
New
Status in xorg-server package in Ubuntu:
Triaged
Bug description:
The bug is originated from,
https://bugs.launchpad.net/somerville/+bug/1887915/
https://bugs.launchpad.net/somerville/+bug/1886778
It has some problem when user connect to external 4K monitor with refresh
rate 60.
The problem can be solved by lower the bpc, or lower the refresh rate.
`xrandr --output DP-3 --set "max bpc" 8`
Would like to open this bug to open discussion for enhancing user experience.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27.4
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
DistUpgraded: Fresh install
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+fossa-samwell-tgl+X42
DistroCodename: focal
DistroRelease: Ubuntu 20.04
DistroVariant: ubuntu
DkmsStatus: nvidia, 440.100, 5.6.0-1021-oem, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
Intel Corporation Device [8086:9a49] (rev 01) (prog-if 00 [VGA controller])
Subsystem: Dell Device [1028:09fc]
Subsystem: Dell GP107M [GeForce MX350] [1028:09fc]
InstallationDate: Installed on 2020-08-07 (0 days ago)
InstallationMedia: Ubuntu 20.04 "Focal" - Build amd64 LIVE Binary
20200502-05:58
Package: xorg 1:7.7+19ubuntu14 [origin: unknown]
PackageArchitecture: amd64
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.6.0-1021-oem
root=UUID=41be2253-410a-4ef7-a096-4193a58efdbd ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 5.6.0-1021.21-oem 5.6.19
Tags: third-party-packages focal ubuntu
Uname: Linux 5.6.0-1021-oem x86_64
UnreportableReason: This is not an official Ubuntu package. Please remove any
third party package and try again.
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
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 2:1.20.8-2ubuntu2.2
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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https://bugs.launchpad.net/oem-priority/+bug/1890772/+subscriptions
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