尝试使用 DRI_PRIME=1 时 AMD Radeon R5M430 GPU 出现错误 -> 无法为缓冲区分配虚拟地址

Question

我最近安装了 Ubuntu：(19.04)，我立即注意到 Ubuntu 从未选择我的专用 AMD GPU。

我开始在线寻找解决方案，并发现了"DRI_PRIME=1"在启动应用程序之前要设置的环境变量。

当我尝试使用它启动一些基于 OpenGL 的软件时，遇到了此错误消息：

radeon: Failed to allocate virtual address for buffer:
radeon:    size      : 65536 bytes
radeon:    alignment : 4096 bytes
radeon:    domains   : 4
radeon:    va        : 0x0000000100000000
radeon: Failed to deallocate virtual address for buffer:
radeon:    size      : 65536 bytes
radeon:    va        : 0x100000000
radeon: Failed to allocate virtual address for buffer:
radeon:    size      : 65536 bytes
radeon:    alignment : 4096 bytes
radeon:    domains   : 4
radeon:    va        : 0x0000000100000000
radeon: Failed to deallocate virtual address for buffer:
radeon:    size      : 65536 bytes
radeon:    va        : 0x100000000
radeonsi: Failed to create a context.
radeon: Failed to allocate virtual address for buffer:
radeon:    size      : 65536 bytes
radeon:    alignment : 4096 bytes
radeon:    domains   : 4
radeon:    va        : 0x0000000100000000
radeon: Failed to deallocate virtual address for buffer:
radeon:    size      : 65536 bytes
radeon:    va        : 0x100000000
radeon: Failed to allocate virtual address for buffer:
radeon:    size      : 65536 bytes
radeon:    alignment : 4096 bytes
radeon:    domains   : 4
radeon:    va        : 0x0000000100000000
radeon: Failed to deallocate virtual address for buffer:
radeon:    size      : 65536 bytes
radeon:    va        : 0x100000000
radeonsi: Failed to create a context.

X Error of failed request:  GLXBadContext
  Major opcode of failed request:  152 (GLX)
  Minor opcode of failed request:  6 (X_GLXIsDirect)
  Serial number of failed request:  35
  Current serial number in output stream:  34

我的所有程序都不会出现此错误。例如，即使我使用 DRI_PRIME=1，VSCode 也能顺利启动。

Answer 1

经过几个小时无用的尝试，我终于找到了解决方案！

解决我的问题的方法是添加radeon.runpm=0到文件/etc/默认/grub在里面GRUB_CMDLINE_LINUX_DEFAULT部分，然后DRI_PRIME=1在文件末尾添加/etc/环境。