А что в логе про EDID написано?
cat /var/log/Xorg.0.log|grep -A10 -B10 EDID
Вообще, можно было не картинкой, а текстом вставить (и лучше). А с рабочим кабелем другой набор разрешений показывается? И подсоединён к тому же разъёму?
разъем на системнике один.
ваша команда cat /var/log/Xorg.0.log|grep "AccelMethod" ничего не выдает
[ 3.288] compiled for 1.18.4, module version = 1.0.0
[ 3.288] ABI class: X.Org ANSI C Emulation, version 0.4
[ 3.288] (II) glamor: OpenGL accelerated X.org driver based.
[ 3.350] (II) glamor: EGL version 1.4 (DRI2):
[ 3.371] (II) modeset(0): glamor initialized
[ 3.372] (II) modeset(0): Output VGA-1 has no monitor section
[ 3.373] (II) modeset(0): Output HDMI-1 has no monitor section
[ 3.373] (II) modeset(0): Output HDMI-2 has no monitor section
[ 3.373] (II) modeset(0): Output DP-1 has no monitor section
[ 3.373] (II) modeset(0): Output DP-2 has no monitor section
[ 3.374] (II) modeset(0): EDID for output VGA-1
[ 3.375] (II) modeset(0): Printing probed modes for output VGA-1
[ 3.375] (II) modeset(0): Modeline "1024x768"x60.0 65.00 1024 1048 1184 1344 768 771 777 806 -hsync -vsync (48.4 kHz e)
[ 3.375] (II) modeset(0): Modeline "800x600"x60.3 40.00 800 840 968 1056 600 601 605 628 +hsync +vsync (37.9 kHz e)
[ 3.375] (II) modeset(0): Modeline "800x600"x56.2 36.00 800 824 896 1024 600 601 603 625 +hsync +vsync (35.2 kHz e)
[ 3.375] (II) modeset(0): Modeline "848x480"x60.0 33.75 848 864 976 1088 480 486 494 517 +hsync +vsync (31.0 kHz e)
[ 3.375] (II) modeset(0): Modeline "640x480"x59.9 25.18 640 656 752 800 480 490 492 525 -hsync -vsync (31.5 kHz e)
[ 3.375] (II) modeset(0): EDID for output HDMI-1
[ 3.376] (II) modeset(0): EDID for output HDMI-2
[ 3.376] (II) modeset(0): EDID for output DP-1
[ 3.376] (II) modeset(0): EDID for output DP-2
[ 3.376] (II) modeset(0): Output VGA-1 connected
[ 3.376] (II) modeset(0): Output HDMI-1 disconnected
[ 3.376] (II) modeset(0): Output HDMI-2 disconnected
[ 3.376] (II) modeset(0): Output DP-1 disconnected
[ 3.376] (II) modeset(0): Output DP-2 disconnected
[ 3.376] (II) modeset(0): Using exact sizes for initial modes
[ 3.376] (II) modeset(0): Output VGA-1 using initial mode 1024x768 +0+0
[ 3.376] (II) modeset(0): Using default gamma of (1.0, 1.0, 1.0) unless otherwise stated.
[ 3.376] (==) modeset(0): DPI set to (96, 96)
[ 3.376] (II) Loading sub module "fb"