以下显示器设置在 Raspberry Pi 2 上的 Ubuntu mate 中有效。如何在 Ubuntu Desktop 16.04 中复制这些设置？我的显示器是 LG Ultrawide。我进行了广泛的搜索，但所有建议的修复方法都不适合我。
hdmi_ignore_cec_init=1
hdmi_drive=2
disable_overscan=1
hdmi_ignore_edid=0xa5000080
hdmi_group=2
hdmi_mode=87
hdmi_timings=2560 1 64 64 96 1080 1 3 10 31 0 0 1 60 0 185580000 8
config_hdmi_boost=4
max_framebuffer_width=2560
max_framebuffer_height=1280
framebuffer_width=2560
framebuffer_height=1080
gpu_mem=128
arm_freq=900
gpu_freq=275
sdram_freq=500
hdmi_pixel_freq_limit=400000000
avoid_pwm_pll=1
我尝试了以下方法：
xrandr --newmode "2560x1080_60.00" 230.00 2560 2720 2992 3424 1080 1083 1093 1120 -hsync +vsync
但是当我尝试添加它时我得到：
xxx@cryptoporticus:/usr/share/X11/xorg.conf.d$
xrandr --addmode DVI-I-2 2560x1080_60.00
X Error of failed request: BadMatch (invalid parameter attributes)
Major opcode of failed request: 140 (RANDR)
Minor opcode of failed request: 18 (RRAddOutputMode)
Serial number of failed request: 29
Current serial number in output stream: 30
xrandr 输出：
兰德
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 8192 x 8192
DVI-I-0 disconnected (normal left inverted right x axis y axis)
TV-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 disconnected (normal left inverted right x axis y axis)
DVI-I-2 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 798mm x 334mm
1920x1080 60.00*+ 59.94 50.00 29.97 60.05 60.00 50.04
1680x1050 59.95
1600x900 60.00
1280x1024 75.02 60.02
1280x720 60.00 59.94 50.00
1152x864 75.00
1024x768 75.03 60.00
800x600 75.00 60.32
720x576 50.00
720x480 59.94
640x480 75.00 59.94 59.93
2560x1080_60.00 (0x282) 230.000MHz -HSync +VSync
h: width 2560 start 2720 end 2992 total 3424 skew 0 clock 67.17KHz
v: height 1080 start 1083 end 1093 total 1120 clock 59.98Hz
get-edid 输出
Section "Monitor"
Identifier "LG ULTRAWIDE"
ModelName "LG ULTRAWIDE"
VendorName "GSM"
# Monitor Manufactured week 4 of 2014
# EDID version 1.3
# Digital Display
DisplaySize 800 340
Gamma 2.20
Option "DPMS" "true"
Horizsync 30-90
VertRefresh 56-75
# Maximum pixel clock is 240MHz
#Not giving standard mode: 1152x864, 75Hz
#Not giving standard mode: 1280x1024, 60Hz
#Not giving standard mode: 1280x720, 60Hz
#Not giving standard mode: 1600x900, 60Hz
#Not giving standard mode: 1680x1050, 60Hz
#Extension block found. Parsing...
Modeline "Mode 12" 148.50 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
Modeline "Mode 0" 185.58 2560 2624 2688 2784 1080 1083 1093 1111 -hsync -vsync
Modeline "Mode 1" 148.50 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
Modeline "Mode 2" 148.500 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
Modeline "Mode 3" 74.250 1280 1390 1420 1650 720 725 730 750 +hsync +vsync
Modeline "Mode 4" 27.027 720 736 798 858 480 489 495 525 -hsync -vsync
Modeline "Mode 5" 74.250 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
Modeline "Mode 6" 74.250 1920 2448 2492 2640 1080 1082 1089 1125 +hsync +vsync interlace
Modeline "Mode 7" 27.000 720 732 796 864 576 581 586 625 -hsync -vsync
Modeline "Mode 8" 74.250 1920 2008 2052 2200 1080 1082 1087 1125 +hsync +vsync interlace
Modeline "Mode 9" 148.500 1920 2448 2492 2640 1080 1084 1089 1125 +hsync +vsync
Modeline "Mode 10" 25.200 640 656 752 800 480 490 492 525 -hsync -vsync
Modeline "Mode 11" 74.250 1280 1720 1760 1980 720 725 730 750 +hsync +vsync
Modeline "Mode 13" 74.25 1920 2008 2052 2200 540 542 547 562 +hsync +vsync interlace
Modeline "Mode 14" 74.25 1280 1390 1430 1650 720 725 730 750 +hsync +vsync
Modeline "Mode 15" 27.00 720 736 798 858 480 489 495 525 -hsync -vsync
Option "PreferredMode" "Mode 12"
EndSection
get-edid 输出：
答案1
看起来你的刷新率（60hz）太高了，这导致 pclk 超出了你的卡+电缆+显示器组合支持的范围。
edid 输出有您需要的模式行，它是模式 0
经过反复试验，我使用 cvt 程序生成了以下模式行。它尽可能接近模式 0 定义，但采用与 xrandr 或 xorg.conf 中使用的格式
$ cvt 2560 1080 49.45
# 2560x1080 49.36 Hz (CVT) hsync: 54.98 kHz; pclk: 186.50 MHz
Modeline "2560x1080_49.45" 186.50 2560 2712 2976 3392 1080 1083 1093 1114 -hsync +vsync
如果这不起作用，请尝试将 49.95 更改为使用 49 来降低 pclk。
另一件需要检查的事情是显示器上的 HDMI 模式设置，对于高于高清的分辨率，值得启用较新的 HDMI 模式，如 1.4a 或 2.0，这可能会改变 PreferredMode 设置。