运行 Arch Linux、内核 4.2.5-1、Lightdm 1.16.5、xorg-server 1.17.4-2、nvidia 255.11-4、GTX 780 双链路 dvi 输出。
我有一台 QNIX Evolution II 2710，正在尝试对其进行超频，但遇到了一些 xorg 问题。总结一下：如果我以错误的方式浏览 xorg 的配置，我会看到一个测试屏幕。下面是我的 xorg.conf 的相关部分。这些行被注释了，因为我是从当前配置中复制/粘贴的，而且我更喜欢有一个可以工作的桌面 :)
Section "Monitor"
# HorizSync 88.8 - 88.8
# VertRefresh 48.0 - 120.0
Identifier "Monitor0"
VendorName "Unknown"
# ModelName "HYO DUAL-DVI"
# ModeLine "2560x1440_60" 312.25 2560 2752 3024 3488 1440 1443 1448 1493 -hsync +vsync
# ModeLine "2560x1440_86" 330.00 2560 2608 2640 2652 1440 1441 1444 1445 +hsync +vsync
# ModeLine "2560x1440_96" 519.25 2560 2776 3056 3552 1440 1443 1448 1524 -hsync +vsync
# ModeLine "2560x1440_96_2" 400.00 2560 2608 2640 2744 1440 1443 1448 1512 +hsync +vsync
# ModeLine "2560x1440_99" 536.50 2560 2776 3056 3552 1440 1443 1448 1527 -hsync +vsync
# ModeLine "2560x1440_120" 661.25 2560 2784 3064 3568 1440 1443 1448 1545 -hsync +vsync
# Modeline "2560x1440_120_2" 459.86 2560 2608 2640 2652 1440 1441 1444 1445 +hsync +vsync
Option "DPMS"
EndSection
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce GTX 780"
Option "NoLogo" "True"
Option "ConnectedMonitor" "DFP-3"
# Option "CustomEDID" "DFP-3: /etc/X11/2710_edid_60.bin"
Option "IgnoreEDIDChecksum" "DFP-3"
EndSection
Section "Screen"
# Option "UseEDID" "False"
# Option "UseEDIDDPI" "False"
# Option "UseEDIDFreqs" "False"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "IgnoreEDIDChecksum" "True"
Option "ExactModeTimingsDVI" "True"
Option "ModeValidation" "AllowNon60hzmodesDFPModes, NoEDIDDFPMaxSizeCheck, NoVertRefreshCheck, NoHorizSyncCheck, NoDFPNativeResolutionCheck, NoMaxSizeCheck, NoMaxPClkCheck, AllowNonEdidModes"
# NoEDIDModes
Option "Stereo" "0"
Option "nvidiaXineramaInfoOrder" "DFP-3"
Option "metamodes" "nvidia-auto-select +0+0"
Option "SLI" "Off"
Option "MultiGPU" "Off"
Option "BaseMosaic" "off"
Option "Coolbits" "26"
SubSection "Display"
Depth 24
EndSubSection
# Option "metamodes" "DFP-3: 2560x1440_60 +0 +0"
# Option "metamodes" "DFP-3: 2560x1440_96 +0 +0"
# Option "metamodes" "DFP-3: 2560x1440_99 +0 +0"
# Option "metamodes" "DFP-3: 2560x1440_120 +0 +0"
EndSection
上面的 modelines 是从 cvt 生成的 modelines 和我在一篇博客文章中找到的用于对同一台显示器进行超频的 modelines 的组合。每种模式都会产生 xorg 测试屏幕（循环 RGBW 颜色）。我还特意留出了“NoEDIDModes”选项，因为这可以保证在 xorg 启动时出现测试屏幕。除了复制默认模式之外，尝试添加任何 modeline 都会导致 xrandr 错误：
me@host /etc/X11 % xrandr --addmode DVI-D-0 2560x1440_96_2
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: 39
Current serial number in output stream: 40
因此，我随后以日志级别 6 启动了 x，并深入研究了生成的 Xorg.2。此处使用的 xorg.conf 包含上述配置中未注释的模式行、检查和相应的元模式。我不会费心发布完整日志，因为它有 1500 行“模式 320x240d73 无效”，但以下是我认为有趣的部分：
[ 38519.330] (II) NVIDIA(GPU-0): --- Building ModePool for DFP-3 ---
[ 38519.330] (WW) NVIDIA(GPU-0): Unrecognized ModeValidation token "AllowNon60hzmodesDFPModes";
[ 38519.330] (WW) NVIDIA(GPU-0): ignoring.
[ 38519.330] (WW) NVIDIA(GPU-0): Unrecognized ModeValidation token "NoEDIDDFPMaxSizeCheck";
[ 38519.330] (WW) NVIDIA(GPU-0): ignoring.
[ 38519.330] (WW) NVIDIA(GPU-0): Unrecognized ModeValidation token
[ 38519.330] (WW) NVIDIA(GPU-0): "NoDFPNativeResolutionCheck"; ignoring.
[ 38519.353] (II) NVIDIA(0): Using MetaMode string: "nvidia-auto-select +0+0"
[ 38519.353] (II) NVIDIA(0): Requested modes:
[ 38519.353] (II) NVIDIA(0): "nvidia-auto-select+0+0"
[ 38519.353] (II) NVIDIA(0): Validated MetaModes:
[ 38519.353] (II) NVIDIA(0): MetaMode "nvidia-auto-select+0+0":
[ 38519.353] (II) NVIDIA(0): Size: 1024 x 768
[ 38519.353] (II) NVIDIA(0): DFP-3: "nvidia-auto-select"
[ 38519.353] (II) NVIDIA(0): Size : 1024 x 768
[ 38519.353] (II) NVIDIA(0): Offset : +0 +0
[ 38519.353] (II) NVIDIA(0): Panning
[ 38519.353] (II) NVIDIA(0): Domain : 1024 x 768
[ 38519.353] (II) NVIDIA(0): Tracking Area: 1024 x 768 +0 +0
[ 38519.353] (II) NVIDIA(0): Border : 0,0,0,0
[ 38519.398] (II) NVIDIA(0): Setting mode "nvidia-auto-select+0+0"
就是这样...没有错误或警告，但我注意到当我尝试使用此元模式选项时，它由于某种原因选择了元模式“nvidia-auto-select”：
Option "metamodes" "DFP-3: 2560x1440_96 +0 +0"
接下来，我将监视器的 edid 导出到 .bin 文件，并尝试使用文件中的相同内容覆盖默认时间（概念验证，如果我可以使用 edid 文件而不是 modeline/metamode）。Xorg 测试屏幕；我的 xorg.log 中的内容如下：
[ 39803.648] (**) NVIDIA(0): Option "IgnoreEDIDChecksum" "True"
[ 39803.759] (WW) NVIDIA(0): The EDID read for display device DVI-D-0 is invalid:
[ 39803.759] (WW) NVIDIA(0): - The EDID has a bad checksum. The "IgnoreEDIDChecksum" X configuration option may be used to attempt using mode timings in this EDID in spite of this error. A corrupt EDID may have mode timings beyond the capabilities of your display, and could damage your hardware. Please use with care.
[ 39803.778] (WW) NVIDIA(0): DFP-3 does not have an EDID, or its EDID does not contain a
[ 39803.778] (WW) NVIDIA(0): maximum image size; cannot compute DPI from DFP-3's EDID.
至少这次我得到了一个错误。不过我使用了 IgnoreEDIDChecksum 选项，并且我亲自检查了 EDID 的校验和以确认它确实正确。我手工制作了一个带有我想要的 modeline 的 edid.bin，但不幸的是，我无法在不出现此类错误的情况下对其进行测试。
欢迎提供任何帮助/评论:)