我正在尝试在我的笔记本电脑上设置两个显示器配置，使用双操作系统设置（ubuntu 16.04 和 win7）通过 DisplayPort 连接 27 英寸戴尔 u2717d 显示器。
我有单个视频适配器 ATI/AMD Radeon HD4670 (RV730)
我确信我的显卡支持原始 2560x1440 分辨率，因为它在同一台笔记本电脑的 Win7 中运行没有任何问题。所以这 100% 不是显卡问题。
但在 Ubuntu 中我只能选择 2048x1080@24Hz。我尝试向 xrandr 添加其他模式并开始新的输出：
$ cvt 2560 1440 60
2560x1440 59.96 Hz (CVT 3.69M9) hsync: 89.52 kHz; pclk: 312.25 MHz
Modeline "2560x1440_60.00" 312.25 2560 2752 3024 3488 1440 1443 1448 1493 -hsync +vsync
$sudo xrandr --newmode "2560x1440_60.00" 312.25 2560 2752 3024 3488 1440 1443 1448 1493 -hsync +vsync
$sudo xrandr --addmode DisplayPort-0 2560x1440_60.00
但之后，我只看到黑屏和显示器提供的消息，说未找到来自我的笔记本电脑的信号。
如何在我的 Ubuntu 16.04 上实现原始 2560x1440 分辨率？
我是 Linux 世界的新手，因此我寻求帮助，并希望得到详细的答复或解决问题的步骤。
更新：输出sudo sh -c "lsb_release -sd; dmidecode -s system-product-name; echo ==; lshw -c display; echo ==; xrandr --verbose; cat /etx/X11/xorg.conf; echo ==; ls /sys/class/drm/*/edid | xargs -i{} sh -c \"echo {}; parse-edid < {}\""
Ubuntu 16.04.1 LTS
Studio XPS 1645
==
*-display
description: VGA compatible controller
product: RV730/M96-XT [Mobility Radeon HD 4670]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 0
bus info: pci@0000:02:00.0
version: 00
width: 32 bits
clock: 33MHz
capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
configuration: driver=radeon latency=0
resources: irq:30 memory:d0000000-dfffffff ioport:2000(size=256) memory:cfef0000-cfefffff memory:cfe00000-cfe1ffff
==
Screen 0: minimum 320 x 200, current 2048 x 2160, maximum 8192 x 8192
VGA-0 disconnected (normal left inverted right x axis y axis)
Identifier: 0x51
Timestamp: 375584
Subpixel: no subpixels
Clones:
CRTCs: 0 1
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
scaling mode: None
supported: None, Full, Center, Full aspect
load detection: 1
range: (0, 1)
HDMI-0 disconnected (normal left inverted right x axis y axis)
Identifier: 0x52
Timestamp: 375584
Subpixel: horizontal rgb
Clones:
CRTCs: 0 1
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
audio: auto
supported: off, on, auto
scaling mode: None
supported: None, Full, Center, Full aspect
dither: off
supported: off, on
underscan vborder: 0
range: (0, 128)
underscan hborder: 0
range: (0, 128)
underscan: off
supported: off, on, auto
coherent: 1
range: (0, 1)
LVDS connected primary 1920x1080+128+1080 (0x56) normal (normal left inverted right x axis y axis) 344mm x 193mm
Identifier: 0x53
Timestamp: 375584
Subpixel: horizontal rgb
Gamma: 1.0:1.0:1.0
Brightness: 1.0
Clones:
CRTC: 0
CRTCs: 0 1
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
EDID:
00ffffffffffff0006afed1100000000
01130103902213780ac8959e57549226
0f505400000001010101010101010101
0101010101014c36805e703846401e14
aa0058c11000001a4c36805e70384640
1e14aa0058c11000001a000000fe004b
30323654804231353648573100000000
00000000000000000002010a202000c9
scaling mode: Full
supported: None, Full, Center, Full aspect
1920x1080 (0x56) 139.000MHz +HSync -VSync *current +preferred
h: width 1920 start 1950 end 1970 total 2014 skew 0 clock 69.02KHz
v: height 1080 start 1090 end 1100 total 1150 clock 60.01Hz
1680x1050 (0x57) 146.250MHz -HSync +VSync
h: width 1680 start 1784 end 1960 total 2240 skew 0 clock 65.29KHz
v: height 1050 start 1053 end 1059 total 1089 clock 59.95Hz
1400x1050 (0x58) 121.750MHz -HSync +VSync
h: width 1400 start 1488 end 1632 total 1864 skew 0 clock 65.32KHz
v: height 1050 start 1053 end 1057 total 1089 clock 59.98Hz
1280x1024 (0x59) 109.000MHz -HSync +VSync
h: width 1280 start 1368 end 1496 total 1712 skew 0 clock 63.67KHz
v: height 1024 start 1027 end 1034 total 1063 clock 59.89Hz
1440x900 (0x5a) 106.500MHz -HSync +VSync
h: width 1440 start 1528 end 1672 total 1904 skew 0 clock 55.93KHz
v: height 900 start 903 end 909 total 934 clock 59.89Hz
1280x960 (0x5b) 101.250MHz -HSync +VSync
h: width 1280 start 1360 end 1488 total 1696 skew 0 clock 59.70KHz
v: height 960 start 963 end 967 total 996 clock 59.94Hz
1280x854 (0x5c) 89.250MHz -HSync +VSync
h: width 1280 start 1352 end 1480 total 1680 skew 0 clock 53.12KHz
v: height 854 start 857 end 867 total 887 clock 59.89Hz
1280x800 (0x5d) 83.500MHz -HSync +VSync
h: width 1280 start 1352 end 1480 total 1680 skew 0 clock 49.70KHz
v: height 800 start 803 end 809 total 831 clock 59.81Hz
1280x720 (0x5e) 74.500MHz -HSync +VSync
h: width 1280 start 1344 end 1472 total 1664 skew 0 clock 44.77KHz
v: height 720 start 723 end 728 total 748 clock 59.86Hz
1152x768 (0x5f) 71.750MHz -HSync +VSync
h: width 1152 start 1216 end 1328 total 1504 skew 0 clock 47.71KHz
v: height 768 start 771 end 781 total 798 clock 59.78Hz
1024x768 (0x60) 63.500MHz -HSync +VSync
h: width 1024 start 1072 end 1176 total 1328 skew 0 clock 47.82KHz
v: height 768 start 771 end 775 total 798 clock 59.92Hz
800x600 (0x61) 38.250MHz -HSync +VSync
h: width 800 start 832 end 912 total 1024 skew 0 clock 37.35KHz
v: height 600 start 603 end 607 total 624 clock 59.86Hz
848x480 (0x62) 31.500MHz -HSync +VSync
h: width 848 start 872 end 952 total 1056 skew 0 clock 29.83KHz
v: height 480 start 483 end 493 total 500 clock 59.66Hz
720x480 (0x63) 26.750MHz -HSync +VSync
h: width 720 start 744 end 808 total 896 skew 0 clock 29.85KHz
v: height 480 start 483 end 493 total 500 clock 59.71Hz
640x480 (0x64) 23.750MHz -HSync +VSync
h: width 640 start 664 end 720 total 800 skew 0 clock 29.69KHz
v: height 480 start 483 end 487 total 500 clock 59.38Hz
DisplayPort-0 connected 2048x1080+0+0 (0x65) normal (normal left inverted right x axis y axis) 597mm x 336mm
Identifier: 0x54
Timestamp: 375584
Subpixel: horizontal rgb
Gamma: 1.0:1.0:1.0
Brightness: 1.0
Clones:
CRTC: 1
CRTCs: 0 1
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
EDID:
00ffffffffffff0010acea4053333538
1b1a0104a53c22783aee95a3544c9926
0f5054a54b00714fa9408180d1c00101
010101010101565e00a0a0a029503020
350055502100001a000000ff004a3058
594e363739383533530a000000fc0044
454c4c205532373137440a20000000fd
00324b1e5819010a20202020202001a0
02031cf14f9005040302071601061112
1513141f23091f0783010000023a8018
71382d40582c450055502100001e7e39
00a080381f4030203a0055502100001a
011d007251d01e206e28550055502100
001ebf1600a08038134030203a005550
2100001a000000000000000000000000
00000000000000000000000000000072
audio: auto
supported: off, on, auto
scaling mode: None
supported: None, Full, Center, Full aspect
dither: off
supported: off, on
underscan vborder: 0
range: (0, 128)
underscan hborder: 0
range: (0, 128)
underscan: off
supported: off, on, auto
coherent: 1
range: (0, 1)
2048x1080 (0x65) 58.230MHz +HSync -VSync *current
h: width 2048 start 2096 end 2128 total 2208 skew 0 clock 26.37KHz
v: height 1080 start 1083 end 1093 total 1099 clock 24.00Hz
1920x1080i (0x66) 74.250MHz +HSync +VSync Interlace
h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 33.75KHz
v: height 1080 start 1084 end 1094 total 1125 clock 60.00Hz
1920x1080i (0x67) 74.250MHz +HSync +VSync Interlace
h: width 1920 start 2448 end 2492 total 2640 skew 0 clock 28.12KHz
v: height 1080 start 1084 end 1094 total 1125 clock 50.00Hz
1920x1080i (0x68) 74.176MHz +HSync +VSync Interlace
h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 33.72KHz
v: height 1080 start 1084 end 1094 total 1125 clock 59.94Hz
1280x720 (0x69) 74.250MHz +HSync +VSync
h: width 1280 start 1390 end 1430 total 1650 skew 0 clock 45.00KHz
v: height 720 start 725 end 730 total 750 clock 60.00Hz
1280x720 (0x6a) 74.250MHz +HSync +VSync
h: width 1280 start 1720 end 1760 total 1980 skew 0 clock 37.50KHz
v: height 720 start 725 end 730 total 750 clock 50.00Hz
1280x720 (0x6b) 74.176MHz +HSync +VSync
h: width 1280 start 1390 end 1430 total 1650 skew 0 clock 44.96KHz
v: height 720 start 725 end 730 total 750 clock 59.94Hz
1024x768 (0x6c) 78.800MHz +HSync +VSync
h: width 1024 start 1040 end 1136 total 1312 skew 0 clock 60.06KHz
v: height 768 start 769 end 772 total 800 clock 75.08Hz
1024x768 (0x6d) 65.000MHz -HSync -VSync
h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 48.36KHz
v: height 768 start 771 end 777 total 806 clock 60.00Hz
800x600 (0x6e) 49.500MHz +HSync +VSync
h: width 800 start 816 end 896 total 1056 skew 0 clock 46.88KHz
v: height 600 start 601 end 604 total 625 clock 75.00Hz
800x600 (0x6f) 40.000MHz +HSync +VSync
h: width 800 start 840 end 968 total 1056 skew 0 clock 37.88KHz
v: height 600 start 601 end 605 total 628 clock 60.32Hz
720x576 (0x70) 27.000MHz -HSync -VSync
h: width 720 start 732 end 796 total 864 skew 0 clock 31.25KHz
v: height 576 start 581 end 586 total 625 clock 50.00Hz
720x576i (0x71) 13.500MHz -HSync -VSync Interlace
h: width 720 start 732 end 795 total 864 skew 0 clock 15.62KHz
v: height 576 start 580 end 586 total 625 clock 50.00Hz
720x480 (0x72) 27.027MHz -HSync -VSync
h: width 720 start 736 end 798 total 858 skew 0 clock 31.50KHz
v: height 480 start 489 end 495 total 525 clock 60.00Hz
720x480 (0x73) 27.000MHz -HSync -VSync
h: width 720 start 736 end 798 total 858 skew 0 clock 31.47KHz
v: height 480 start 489 end 495 total 525 clock 59.94Hz
720x480i (0x74) 13.514MHz -HSync -VSync Interlace
h: width 720 start 739 end 801 total 858 skew 0 clock 15.75KHz
v: height 480 start 488 end 494 total 525 clock 60.00Hz
720x480i (0x75) 13.500MHz -HSync -VSync Interlace
h: width 720 start 739 end 801 total 858 skew 0 clock 15.73KHz
v: height 480 start 488 end 494 total 525 clock 59.94Hz
640x480 (0x76) 31.500MHz -HSync -VSync
h: width 640 start 656 end 720 total 840 skew 0 clock 37.50KHz
v: height 480 start 481 end 484 total 500 clock 75.00Hz
640x480 (0x77) 25.200MHz -HSync -VSync
h: width 640 start 656 end 752 total 800 skew 0 clock 31.50KHz
v: height 480 start 490 end 492 total 525 clock 60.00Hz
640x480 (0x78) 25.175MHz -HSync -VSync
h: width 640 start 656 end 752 total 800 skew 0 clock 31.47KHz
v: height 480 start 490 end 492 total 525 clock 59.94Hz
720x400 (0x79) 28.320MHz -HSync +VSync
h: width 720 start 738 end 846 total 900 skew 0 clock 31.47KHz
v: height 400 start 412 end 414 total 449 clock 70.08Hz
cat: /etx/X11/xorg.conf: No such file or directory
==
/sys/class/drm/card0-DP-1/edid
sh: 1: parse-edid: not found
/sys/class/drm/card0-HDMI-A-1/edid
sh: 1: parse-edid: not found
/sys/class/drm/card0-LVDS-1/edid
sh: 1: parse-edid: not found
/sys/class/drm/card0-VGA-1/edid
sh: 1: parse-edid: not found
答案1
我在使用 Radeon HD4250 时也遇到了同样的问题。在 Windows 10 上（降低了刷新率），我可以毫无问题地获得所需的分辨率（在我的情况下是 2560x1080），但在 Linux 上，我只能使用 1920x1080。
然后我发现这个帖子并尝试联电。umc 的 modeline 在我的桌面（openSUSE）上完美运行。如果您仍在使用 Ubuntu，我建议您尝试一下。这是一个示例。
> umc 2560 1440 60 --rbt
# 2560x1440x59.95 @ 88.787kHz
Modeline "2560x1440x59.95" 241.500000 2560 2608 2640 2720 1440 1443 1447 1481 +HSync -VSync
> umc 2560 1440 50 --rbt
# 2560x1440x49.95 @ 73.621kHz
Modeline "2560x1440x49.95" 200.250000 2560 2608 2640 2720 1440 1443 1447 1474 +HSync -VSync