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如何在ARM系统上为X11指定默认图形设备？

tag-icon • tag-icon x11 arm gpu
如何在ARM系统上为X11指定默认图形设备？

我在 armv7 Chromebook 上运行 Parabola GNU/Linux（Arch 变体）。我正在尝试让 X11 使用集成的 Mali GPU；然而，我遇到了困难。

/dev/dri列出了两个显卡：card0和card1。card1是 Mali GPU，card0我相信这是 Rockchip Soc 中包含的更简单的后备图形设备。当我启动 X11 时，两个设备似乎都能被识别（如以下日志文​​件所示）；然而它打印一条消息说“没有找到主总线或设备”并且它似乎回退到card0，这是更简单的设备（不是Mali）：

（显示我的文件的一部分/var/log/Xorg.1.log）

[  2710.485] (II) systemd-logind: took control of session /org/freedesktop/login1/session/_32
[  2710.487] (II) xfree86: Adding drm device (/dev/dri/card0)
[  2710.488] (II) systemd-logind: got fd for /dev/dri/card0 226:0 fd 10 paused 0
[  2710.489] (II) xfree86: Adding drm device (/dev/dri/card1)
[  2710.490] (II) systemd-logind: got fd for /dev/dri/card1 226:1 fd 11 paused 0
[  2710.491] (II) no primary bus or device found
[  2710.491]    falling back to /sys/devices/platform/display-subsystem/drm/card0
[  2710.491] (II) LoadModule: "glx"
[  2710.491] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[  2710.495] (II) Module glx: vendor="X.Org Foundation"
[  2710.495]    compiled for 1.20.8, module version = 1.0.0
[  2710.495]    ABI class: X.Org Server Extension, version 10.0

我尝试创建以下配置文件（/usr/share/X11/xorg.conf.d/30-driver-mali.conf）：

Section "Device"
      Identifier "Card1"
      Driver "panfrost"
EndSection

然而，这似乎没有帮助。从下面的日志中可以看出，X11 仍然回落到 card0，这次它无法启动，因为 panfrost 驱动程序是该卡的错误驱动程序：

[  2522.953] (II) systemd-logind: took control of session /org/freedesktop/login1/session/_32
[  2522.955] (II) xfree86: Adding drm device (/dev/dri/card0)
[  2522.957] (II) systemd-logind: got fd for /dev/dri/card0 226:0 fd 10 paused 0
[  2522.958] (II) xfree86: Adding drm device (/dev/dri/card1)
[  2522.959] (II) systemd-logind: got fd for /dev/dri/card1 226:1 fd 11 paused 0
[  2522.959] (II) no primary bus or device found
[  2522.960]    falling back to /sys/devices/platform/display-subsystem/drm/card0
[  2522.960] (II) LoadModule: "glx"
[  2522.960] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[  2522.964] (II) Module glx: vendor="X.Org Foundation"
[  2522.964]    compiled for 1.20.8, module version = 1.0.0
[  2522.964]    ABI class: X.Org Server Extension, version 10.0
[  2522.964] (II) LoadModule: "panfrost"
[  2522.964] (WW) Warning, couldn't open module panfrost
[  2522.964] (EE) Failed to load module "panfrost" (module does not exist, 0)

那么，如何指定card1为X11的默认图形设备呢？看来我应该能够在某个地方指定这一点，但我不确定如何指定。

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