Date: Mon, 3 Aug 2026 23:03:38 +0200 From: Roger Olofsson <raggen44@gmail.com> To: =?UTF-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@FreeBSD.org> Cc: freebsd-x11@freebsd.org Subject: Re: X.org works on <= 14.3, unusable on >= 14.4 Message-ID: <fb831c86-c0d5-481b-977a-0913acf6d2f4@gmail.com> In-Reply-To: <86y0en9gpa.fsf@ltc.des.dev>
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Den 2026-08-03 kl. 20:55, skrev Dag-Erling Smørgrav: > 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 Hi, Sorry for butting in. I have no idea what I'm talking about and I do not know if it will help you but I have an issue in https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295788 for which I have found a workaround. The symptoms are not exactly the same as yours but the workaround might be interesting anyway. Try this: Install the 14.4 and then use git to switch (while on the 14.4) to the 14.3 kernel source tree. Then grab drm-515-kmod from the 2026Q2 ports tree, remove the version check in the Makefile for the drm-515-kmod, compile drm-515-kmod and try. After the build you can switch back to kernel src for 14.4. As I said, your symptoms are vastly different than mine so I'm most likely just wasting your time. Tuppence worth. /Rogerhome | help
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