我安装了 Ubuntu Server 17，但似乎无法将其置于睡眠/挂起模式。当我使用时systemctl suspend，HDD 会重新启动几次，每次显示器都会闪烁片刻，多行消息会出现一秒钟，然后原始命令行会返回。消息如下：
dpm_run_callback(): pci_pm_suspend+0x0/0x150 returns -38
PM: device 0000:04:00.0 failed to suspend async: error -38
PM: Some devices failed to suspend, or early wake event detected
[drm:uvd_v1_0_ib_test [radeon]] *ERROR* radeon: fenece wait timed out.
[drm:radeon_ib_ring_tests [radeon]] *ERROR* radeon: failed testing IB on ring 5 (-110).
pci_legacy_suspend(): hpsa_suspend+0x0/0x10 [hpsa] returns -38
dpm_run_callback(): pci_pm_suspend+0x0/0x150 returns -38
顺便说一下，重新启动的硬盘似乎连接到 HP 阵列：P410