i have continued with only one monitor for a few hours now including
some sleep and wake events with no issues.
adding the second monitor will cause the freezing behavior to return
more info on the diplays, gpu and drivers
lspci -nnk | grep -i vga -A3
00:02.0 VGA compatible controller [0300]: Intel Corporation Iris Plus Graphics
G7 [8086:8a52] (rev 07)
Subsystem: Dell Device [1028:08b0]
Kernel driver in use: i915
Kernel modules: i915
sudo hwinfo --monitor
32: None 00.0: 10002 LCD Monitor
[Created at monitor.125]
Unique ID: rdCR.cX4k4o0WO73
Parent ID: _Znp.GEk+97+Mnh5
Hardware Class: monitor
Model: "DELL U2721DE"
Vendor: DEL "DELL"
Device: eisa 0x41e0 "DELL U2721DE"
Serial ID: "BFM0R83"
Resolution: 720x400@70Hz
Resolution: 640x480@60Hz
Resolution: 640x480@75Hz
Resolution: 800x600@60Hz
Resolution: 800x600@75Hz
Resolution: 1024x768@60Hz
Resolution: 1024x768@75Hz
Resolution: 1280x1024@75Hz
Resolution: 1152x864@75Hz
Resolution: 1280x1024@60Hz
Resolution: 1600x1200@60Hz
Resolution: 1920x1080@60Hz
Resolution: 2560x1440@60Hz
Size: 597x336 mm
Year of Manufacture: 2021
Week of Manufacture: 11
Detailed Timings #0:
Resolution: 2560x1440
Horizontal: 2560 2608 2640 2720 (+48 +80 +160) -hsync
Vertical: 1440 1443 1448 1481 (+3 +8 +41) +vsync
Frequencies: 241.50 MHz, 88.79 kHz, 59.95 Hz
Driver Info #0:
Max. Resolution: 2560x1440
Vert. Sync Range: 56-76 Hz
Hor. Sync Range: 30-90 kHz
Bandwidth: 241 MHz
Config Status: cfg=new, avail=yes, need=no, active=unknown
Attached to: #25 (VGA compatible controller)
33: None 01.0: 10002 LCD Monitor
[Created at monitor.125]
Unique ID: wkFv.Nd1FTrf9+kC
Parent ID: _Znp.GEk+97+Mnh5
Hardware Class: monitor
Model: "9G4X1 LQ134N1 LCD Monitor"
Vendor: SHP "9G4X1 LQ134N1"
Device: eisa 0x14af
Serial ID: "0"
Resolution: 1920x1200@60Hz
Size: 288x180 mm
Year of Manufacture: 2018
Week of Manufacture: 51
Detailed Timings #0:
Resolution: 1920x1200
Horizontal: 1920 1968 2000 2080 (+48 +80 +160) -hsync
Vertical: 1200 1203 1209 1235 (+3 +9 +35) -vsync
Frequencies: 123.20 MHz, 59.23 kHz, 47.96 Hz
Year of Manufacture: 2018
Week of Manufacture: 51
Detailed Timings #1:
Resolution: 1920x1200
Horizontal: 1920 1968 2000 2080 (+48 +80 +160) -hsync
Vertical: 1200 1203 1209 1235 (+3 +9 +35) -vsync
Frequencies: 154.00 MHz, 74.04 kHz, 59.95 Hz
Config Status: cfg=new, avail=yes, need=no, active=unknown
Attached to: #25 (VGA compatible controller)
34: None 02.0: 10002 LCD Monitor
[Created at monitor.125]
Unique ID: +rIN.9eXZOHf6DW9
Parent ID: _Znp.GEk+97+Mnh5
Hardware Class: monitor
Model: "DELL U2421HE"
Vendor: DEL "DELL"
Device: eisa 0x41e2 "DELL U2421HE"
Serial ID: "76P9023"
Resolution: 720x400@70Hz
Resolution: 640x480@60Hz
Resolution: 640x480@75Hz
Resolution: 800x600@60Hz
Resolution: 800x600@75Hz
Resolution: 1024x768@60Hz
Resolution: 1024x768@75Hz
Resolution: 1280x1024@75Hz
Resolution: 1152x864@75Hz
Resolution: 1280x1024@60Hz
Resolution: 1600x900@60Hz
Resolution: 1920x1080@60Hz
Size: 527x296 mm
Year of Manufacture: 2020
Week of Manufacture: 35
Detailed Timings #0:
Resolution: 1920x1080
Horizontal: 1920 2008 2052 2200 (+88 +132 +280) +hsync
Vertical: 1080 1084 1089 1125 (+4 +9 +45) +vsync
Frequencies: 148.50 MHz, 67.50 kHz, 60.00 Hz
Driver Info #0:
Max. Resolution: 1920x1080
Vert. Sync Range: 56-76 Hz
Hor. Sync Range: 30-90 kHz
Bandwidth: 148 MHz
Config Status: cfg=new, avail=yes, need=no, active=unknown
Attached to: #25 (VGA compatible controller)
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https://bugs.launchpad.net/bugs/2141225
Title:
Kernel panic when connecting USB-C Dell monitors on Ubuntu kernel
6.17.0-14-generic
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