Date: Mon, 03 Aug 2026 20:55:45 +0200 From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@FreeBSD.org> To: x11@freebsd.org Subject: X.org works on <= 14.3, unusable on >= 14.4 Message-ID: <86y0en9gpa.fsf@ltc.des.dev>
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I have a Lenovo ThinkVision with an Intel Core i7-10700T with integrated
graphics and dual Lenovo ThinkVision monitors connected using DP. This
has been working beautifully for several years, up to and including
14.3, using i915kms and the modesetting driver (no xorg.conf). Current
package versions:
xorg-server-21.1.24,1
drm-61-kmod-6.1.128.1403000_10
gpu-firmware-intel-kmod-kabylake-20260519.1403000
(no, I don't know why it's using Kaby Lake firmware on a Comet Lake CPU,
I have all the flavors installed and this is the one it picks)
Starting with 14.4, I can still start X but the display flickers on
every update, which renders it unusable with anything even moderately
graphics-intensive, including `tail -F /var/log/Xorg.0.log` in a
terminal. It appears that each time it flickers it also dumps EDID and
modeline information about my monitors to the log:
[ 67.784] (II) modeset(0): EDID vendor "LEN", prod id 25077
[ 67.784] (II) modeset(0): Using EDID range info for horizontal sync
[ 67.785] (II) modeset(0): Using EDID range info for vertical refresh
[ 67.785] (II) modeset(0): Printing DDC gathered Modelines:
[ 67.785] (II) modeset(0): Modeline "2560x1440"x0.0 241.50 2560 2608 2640 2720 1440 1443 1448 1481 +hsync -vsync (88.8 kHz eP)
[ 67.785] (II) modeset(0): Modeline "1280x720"x0.0 74.25 1280 1390 1430 1650 720 725 730 750 +hsync +vsync (45.0 kHz e)
[ 67.785] (II) modeset(0): Modeline "2560x1440"x0.0 299.00 2560 2608 2640 2720 1440 1443 1448 1470 +hsync -vsync (109.9 kHz e)
[ 67.785] (II) modeset(0): Modeline "640x480"x0.0 25.18 640 656 752 800 480 490 492 525 -hsync -vsync (31.5 kHz e)
[ 67.785] (II) modeset(0): Modeline "720x480"x0.0 27.00 720 736 798 858 480 489 495 525 -hsync -vsync (31.5 kHz e)
[ 67.785] (II) modeset(0): Modeline "1280x720"x0.0 74.25 1280 1720 1760 1980 720 725 730 750 +hsync +vsync (37.5 kHz e)
[ 67.785] (II) modeset(0): Modeline "1920x1080"x0.0 148.50 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync (67.5 kHz e)
[ 67.785] (II) modeset(0): Modeline "1920x1080"x0.0 148.50 1920 2448 2492 2640 1080 1084 1089 1125 +hsync +vsync (56.2 kHz e)
[ 67.785] (II) modeset(0): Modeline "720x576"x0.0 27.00 720 732 796 864 576 581 586 625 -hsync -vsync (31.2 kHz e)
[ 67.785] (II) modeset(0): Modeline "800x600"x0.0 40.00 800 840 968 1056 600 601 605 628 +hsync +vsync (37.9 kHz e)
[ 67.785] (II) modeset(0): Modeline "640x480"x0.0 31.50 640 656 720 840 480 481 484 500 -hsync -vsync (37.5 kHz e)
[ 67.785] (II) modeset(0): Modeline "640x480"x0.0 31.50 640 664 704 832 480 489 492 520 -hsync -vsync (37.9 kHz e)
[ 67.785] (II) modeset(0): Modeline "640x480"x0.0 30.24 640 704 768 864 480 483 486 525 -hsync -vsync (35.0 kHz e)
[ 67.785] (II) modeset(0): Modeline "720x400"x0.0 28.32 720 738 846 900 400 412 414 449 -hsync +vsync (31.5 kHz e)
[ 67.785] (II) modeset(0): Modeline "1280x1024"x0.0 135.00 1280 1296 1440 1688 1024 1025 1028 1066 +hsync +vsync (80.0 kHz e)
[ 67.785] (II) modeset(0): Modeline "1024x768"x0.0 78.75 1024 1040 1136 1312 768 769 772 800 +hsync +vsync (60.0 kHz e)
[ 67.785] (II) modeset(0): Modeline "1024x768"x0.0 75.00 1024 1048 1184 1328 768 771 777 806 -hsync -vsync (56.5 kHz e)
[ 67.785] (II) modeset(0): Modeline "1024x768"x0.0 65.00 1024 1048 1184 1344 768 771 777 806 -hsync -vsync (48.4 kHz e)
[ 67.785] (II) modeset(0): Modeline "832x624"x0.0 57.28 832 864 928 1152 624 625 628 667 -hsync -vsync (49.7 kHz e)
[ 67.785] (II) modeset(0): Modeline "800x600"x0.0 49.50 800 816 896 1056 600 601 604 625 +hsync +vsync (46.9 kHz e)
[ 67.785] (II) modeset(0): Modeline "800x600"x0.0 50.00 800 856 976 1040 600 637 643 666 +hsync +vsync (48.1 kHz e)
[ 67.785] (II) modeset(0): Modeline "1280x1024"x0.0 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync (64.0 kHz e)
[ 67.785] (II) modeset(0): Modeline "1440x900"x0.0 106.50 1440 1520 1672 1904 900 903 909 934 -hsync +vsync (55.9 kHz e)
[ 67.785] (II) modeset(0): Modeline "1680x1050"x0.0 146.25 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsync (65.3 kHz e)
[ 67.785] (II) modeset(0): Modeline "1920x1200"x0.0 193.25 1920 2056 2256 2592 1200 1203 1209 1245 -hsync +vsync (74.6 kHz e)
[ 67.785] (II) modeset(0): Modeline "1152x864"x0.0 108.00 1152 1216 1344 1600 864 865 868 900 +hsync +vsync (67.5 kHz e)
I tried playing with -logverbose but there is nothing else of any use in
the log, just an endless repetition of the above EDID and modeline
information. Running the server with -logverbose 0 suppressed the log
spam but did not cure the flickering or the slowdown.
The monitors are currently daisy-chained using DisplayPort pass-through.
Connecting the second monitor directly using HDMI instead made no
difference.
I have tried:
- 14.3 kernel, 14.3 world and packages - works
- 14.4 kernel, 14.3 world and packages - does not work
- 14.4 kernel, 14.4 world and packages - does not work
- 15.1 kernel, 15.1 world and packages - does not work
Needless to say I'd like to get off 14.3 asap.
Any ideas?
DES
--
Dag-Erling Smørgrav - des@FreeBSD.org
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