我的筆記型電腦最近開始時不時地無法掛起到 RAM。我已經完全重新安裝了 Kubuntu 14.04（可信），但錯誤間歇性地出現。
看看/var/log/pm-powersave.log我看到這樣的條目：
Running hook /usr/lib/pm-utils/power.d/pci_devices false:
Setting Host Bridge 0000:00:00.0 to on
/usr/lib/pm-utils/power.d/pci_devices: 30: /usr/lib/pm-utils/power.d/pci_devices: cannot create /sys/bus/pci/devices/0000:00:00.0/powe
r/control: Read-only file system
Setting Ethernet device 0000:00:19.0 to on
/usr/lib/pm-utils/power.d/pci_devices: 18: /usr/lib/pm-utils/power.d/pci_devices: cannot create /sys/bus/pci/devices/0000:00:19.0/powe
r/control: Read-only file system
Setting Audio device 0000:00:1b.0 to on
/usr/lib/pm-utils/power.d/pci_devices: 26: /usr/lib/pm-utils/power.d/pci_devices: cannot create /sys/bus/pci/devices/0000:00:1b.0/powe
r/control: Read-only file system
Setting card reader device 0000:02:00.0 to on
/usr/lib/pm-utils/power.d/pci_devices: 38: /usr/lib/pm-utils/power.d/pci_devices: cannot create /sys/bus/pci/devices/0000:02:00.0/powe
r/control: Read-only file system
Setting Wireless device 0000:03:00.0 to on
/usr/lib/pm-utils/power.d/pci_devices: 22: /usr/lib/pm-utils/power.d/pci_devices: cannot create /sys/bus/pci/devices/0000:03:00.0/powe
r/control: Read-only file system
/usr/lib/pm-utils/power.d/pci_devices false: success.
mount然而顯示了這一點：
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
我沒有發現在機器掛起和不掛起之間我在機器上運行的任何不同之處。也沒有插入任何新內容。
是什麼導致它報告只讀 sys 檔案系統？有什麼方法可以嘗試重新安裝/sys，以便它可以再次標記為讀取/寫入嗎？