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Xorg 多卡模式设置配置分段错误

tag-icon • tag-icon multiple-monitors xorg xorg.conf segmentation-fault
Xorg 多卡模式设置配置分段错误

使用 xorg-x11-server 1.20.1-5.2.el7_6 ，我想知道我是否犯了一个简单的配置错误？

以下段错误：

Section "ServerLayout" 
    Identifier "Example" 
    Screen 0 "A" 
    Screen 1 "B" 
EndSection 

Section "Device" 
    Identifier "A Card" 
    Driver "modesetting" 
    Screen 0 
    BusID "PCI:16@0:0:0" 
    Option "kmsdev" "/dev/dri/card1" 
    Option "Monitor-DVI-D-1" 
EndSection 

Section "Monitor" 
    Identifier "A Monitor" 
EndSection 

Section "Screen" 
    Identifier "A" 
    Device "A Card" 
    Monitor "A Monitor" 
EndSection 

Section "Device" 
    Identifier "B Card" 
    Driver "modesetting" 
    Screen 1 
    BusID "PCI:56@0:0:0" 
    Option "kmsdev" "/dev/dri/card0" 
    Option "Monitor-HDMI-1" 
EndSection 

Section "Monitor" 
    Identifier "B Monitor" 
EndSection 

Section "Screen" 
    Identifier "B" 
    Device "B Card" 
    Monitor "B Monitor" 
EndSection 

sudo cat /var/log/Xorg.0.log | grep -E '(EE)|(WW)'
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[ 70484.038] (WW) xf86OpenConsole: setpgid failed: Operation not permitted
[ 70484.038] (WW) xf86OpenConsole: setsid failed: Operation not permitted
[ 70484.038] (EE) 
[ 70484.038] (EE) Backtrace:
[ 70484.038] (EE) 0: /usr/bin/X (xorg_backtrace+0x55) [0x5571eeac9185]
[ 70484.039] (EE) 1: /usr/bin/X (0x5571ee918000+0x1b4e09) [0x5571eeacce09]
[ 70484.039] (EE) 2: /lib64/libpthread.so.0 (0x7f1aecfb9000+0xf5d0) [0x7f1aecfc85d0]
[ 70484.039] (EE) 3: /usr/lib64/xorg/modules/drivers/modesetting_drv.so (0x7f1ae91b8000+0xa144) [0x7f1ae91c2144]
[ 70484.039] (EE) 4: /usr/bin/X (0x5571ee918000+0xb0049) [0x5571ee9c8049]
[ 70484.039] (EE) 5: /usr/bin/X (xf86CallDriverProbe+0x4b) [0x5571ee9a700b]
[ 70484.039] (EE) 6: /usr/bin/X (xf86BusConfig+0x46) [0x5571ee9a7966]
[ 70484.039] (EE) 7: /usr/bin/X (InitOutput+0x8ac) [0x5571ee9b4f0c]
[ 70484.039] (EE) 8: /usr/bin/X (0x5571ee918000+0x601b0) [0x5571ee9781b0]
[ 70484.039] (EE) 9: /lib64/libc.so.6 (__libc_start_main+0xf5) [0x7f1aecc0e3d5]
[ 70484.039] (EE) 10: /usr/bin/X (0x5571ee918000+0x4a4ce) [0x5571ee9624ce]
[ 70484.039] (EE) 
[ 70484.039] (EE) Segmentation fault at address 0x2ba
[ 70484.039] (EE) 
[ 70484.039] (EE) Caught signal 11 (Segmentation fault). Server aborting
[ 70484.039] (EE) 
[ 70484.039] (EE) 
[ 70484.039] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[ 70484.039] (EE) 
[ 70484.039] (EE) Server terminated with error (1). Closing log file.

但是，每个单独的部分都没问题。以下两个都有效：

Section "ServerLayout"
    Identifier "Example"
    Screen 0 "A"
EndSection

Section "Device"
    Identifier "A Card"
    Driver "modesetting"
    Screen 0
    BusID "PCI:16@0:0:0"
    Option "kmsdev" "/dev/dri/card1"
    Option "Monitor-DVI-D-1"
EndSection

Section "Monitor"
    Identifier "A Monitor"
EndSection

Section "Screen"
    Identifier "A"
    Device "A Card"
    Monitor "A Monitor"
EndSection


Section "ServerLayout"
    Identifier "Example"
    Screen 0 "B"
EndSection

Section "Device"
    Identifier "B Card"
    Driver "modesetting"
    Screen 0
    BusID "PCI:56@0:0:0"
    Option "kmsdev" "/dev/dri/card0"
    Option "Monitor-HDMI-1"
EndSection

Section "Monitor"
    Identifier "B Monitor"
EndSection

Section "Screen"
    Identifier "B"
    Device "B Card"
    Monitor "B Monitor"
EndSection

是否需要添加其他配置才能使用modesetting驱动程序中的多张卡？如果有所不同，我打算使用 ZaphodHeads，并且我不需要加速其中一张卡。我只是删除了多余的配置以更清楚地说明问题。

答案1

如果给定的 BusID 没有“Screen 0”，则会发生分段错误。核心误解是 ServerLayout 部分中的屏幕编号是不是与设备部分中的屏幕编号相关。

对于任何尝试使用 ZaphodHeads 配置有多张卡的人，这里有一个可运行的示例：

Section "ServerLayout"
    Identifier "Example"
    Screen 0 "A"
    Screen 1 "B"
    Screen 2 "C"
EndSection

Section "Device"
    Identifier "A Card"
    Driver "modesetting"
    BusID "PCI:16@0:0:0"
    Option "kmsdev" "/dev/dri/card1"
    Option "Monitor-DVI-D-1"
EndSection

Section "Monitor"
    Identifier "A Monitor"
EndSection

Section "Screen"
    Identifier "A"
    Device "A Card"
    Monitor "A Monitor"
EndSection

Section "Device"
    Identifier "B Card"
    Driver "modesetting"
    Screen 0
    BusID "PCI:56@0:0:0"
    Option "kmsdev" "/dev/dri/card0"
    Option "Monitor-HDMI-1"
    Option "ZaphodHeads" "HDMI-1"
EndSection

Section "Monitor"
    Identifier "B Monitor"
EndSection

Section "Screen"
    Identifier "B"
    Device "B Card"
    Monitor "B Monitor"
EndSection

Section "Device"
    Identifier "C Card"
    Driver "modesetting"
    Screen 1
    BusID "PCI:56@0:0:0"
    Option "kmsdev" "/dev/dri/card0"
    Option "Monitor-HDMI-2"
    Option "ZaphodHeads" "HDMI-2"
EndSection

Section "Monitor"
    Identifier "C Monitor"
EndSection

Section "Screen"
    Identifier "C"
    Device "C Card"
    Monitor "C Monitor"
EndSection

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