You have been subscribed to a public bug:
The Display continuously flickers when we are using the Displayport connection
with QHD (2560x1440) Benq-Monitors.
The affected Hardware is:
Igel UD3-LX 60 (AMD Ryzen Embedded R1505G with Radeon Vega Gfx)
Using a DP to HDMI-Adapter solves the problem with the given resolution.
This error occurs in both Ubuntu Releases 18.04 and 20.10.
This is what we see in the Logs:
[ 27.144] (II) AMDGPU(0): EDID vendor "BNQ", prod id 32795
[ 27.144] (II) AMDGPU(0): Using hsync ranges from config file
[ 27.144] (II) AMDGPU(0): Using vrefresh ranges from config file
[ 27.144] (II) AMDGPU(0): Printing DDC gathered Modelines:
[ 27.144] (II) AMDGPU(0): Modeline "2560x1440"x0.0 241.50 2560 2608 2640
2720 1440 1443 1448 1481 +hsync -vsync (88.8 kHz eP)
[ 27.144] (II) AMDGPU(0): Modeline "720x480"x0.0 27.00 720 736 798 858
480 489 495 525 -hsync -vsync (31.5 kHz e)
[ 27.144] (II) AMDGPU(0): Modeline "1280x720"x0.0 74.25 1280 1390 1430
1650 720 725 730 750 +hsync +vsync (45.0 kHz e)
[ 27.144] (II) AMDGPU(0): Modeline "1280x720"x0.0 74.25 1280 1720 1760
1980 720 725 730 750 +hsync +vsync (37.5 kHz e)
[ 27.144] (II) AMDGPU(0): Modeline "720x576"x0.0 27.00 720 732 796 864
576 581 586 625 -hsync -vsync (31.2 kHz e)
[ 27.144] (II) AMDGPU(0): Modeline "1920x1080"x0.0 148.50 1920 2008 2052
2200 1080 1084 1089 1125 +hsync +vsync (67.5 kHz e)
[ 27.144] (II) AMDGPU(0): Modeline "1920x1080"x0.0 148.50 1920 2448 2492
2640 1080 1084 1089 1125 +hsync +vsync (56.2 kHz e)
[ 27.144] (II) AMDGPU(0): Modeline "1920x1080i"x0.0 74.25 1920 2008 2052
2200 1080 1084 1094 1125 interlace +hsync +vsync (33.8 kHz e)
[ 27.144] (II) AMDGPU(0): Modeline "1920x1080i"x0.0 74.25 1920 2448 2492
2640 1080 1084 1094 1125 interlace +hsync +vsync (28.1 kHz e)
[ 27.144] (II) AMDGPU(0): Modeline "640x480"x0.0 25.18 640 656 752 800
480 490 492 525 -hsync -vsync (31.5 kHz e)
[ 27.144] (II) AMDGPU(0): Modeline "1440x480i"x0.0 27.00 1440 1478 1602
1716 480 488 494 525 interlace -hsync -vsync (15.7 kHz e)
[ 27.144] (II) AMDGPU(0): Modeline "1440x576i"x0.0 27.00 1440 1464 1590
1728 576 580 586 625 interlace -hsync -vsync (15.6 kHz e)
[ 27.144] (II) AMDGPU(0): Modeline "800x600"x0.0 40.00 800 840 968 1056
600 601 605 628 +hsync +vsync (37.9 kHz e)
[ 27.144] (II) AMDGPU(0): Modeline "640x480"x0.0 31.50 640 656 720 840
480 481 484 500 -hsync -vsync (37.5 kHz e)
[ 27.144] (II) AMDGPU(0): Modeline "720x400"x0.0 28.32 720 738 846 900
400 412 414 449 -hsync +vsync (31.5 kHz e)
[ 27.144] (II) AMDGPU(0): Modeline "1280x1024"x0.0 135.00 1280 1296 1440
1688 1024 1025 1028 1066 +hsync +vsync (80.0 kHz e)
[ 27.144] (II) AMDGPU(0): Modeline "1024x768"x0.0 78.75 1024 1040 1136
1312 768 769 772 800 +hsync +vsync (60.0 kHz e)
[ 27.144] (II) AMDGPU(0): Modeline "1024x768"x0.0 65.00 1024 1048 1184
1344 768 771 777 806 -hsync -vsync (48.4 kHz e)
[ 27.144] (II) AMDGPU(0): Modeline "832x624"x0.0 57.28 832 864 928 1152
624 625 628 667 -hsync -vsync (49.7 kHz e)
[ 27.144] (II) AMDGPU(0): Modeline "800x600"x0.0 49.50 800 816 896 1056
600 601 604 625 +hsync +vsync (46.9 kHz e)
[ 27.144] (II) AMDGPU(0): Modeline "1152x864"x0.0 108.00 1152 1216 1344
1600 864 865 868 900 +hsync +vsync (67.5 kHz e)
[ 27.144] (II) AMDGPU(0): Modeline "1680x1050"x0.0 119.00 1680 1728 1760
1840 1050 1053 1059 1080 +hsync -vsync (64.7 kHz e)
[ 27.144] (II) AMDGPU(0): Modeline "1600x900"x60.0 119.00 1600 1696 1864
2128 900 901 904 932 -hsync +vsync (55.9 kHz e)
[ 27.144] (II) AMDGPU(0): Modeline "1280x1024"x0.0 108.00 1280 1328 1440
1688 1024 1025 1028 1066 +hsync +vsync (64.0 kHz e)
[ 27.144] (II) AMDGPU(0): Modeline "1280x800"x0.0 71.00 1280 1328 1360
1440 800 803 809 823 +hsync -vsync (49.3 kHz e)
[ 30.040] (DB) IGEL-SCREEN-LOCK: Window [layer=1] locked
[ 33.163] (DB) IGEL-SCREEN-LOCK: Window [layer=1] destroyed
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
** Tags: bot-comment flickering igel monitor qhd
--
Screen flickering- QHD Benq
https://bugs.launchpad.net/bugs/1923167
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