Ubuntu: /sys is mounted read-only and this stops my laptop from suspending to RAM



Question:

My laptop has recently started to fail to suspend to RAM from time to time. I've completely re-installed Kubuntu 14.04 (trusty), but the error comes back intermittently.

Looking at /var/log/pm-powersave.log I see entries like this:

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 however shows this:

sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)  

I've not found anything different that I'm running on the machine between when it suspends and when it doesn't. Nothing new has been plugged into it either.

What might be causing it to report a read only sys filesystem? Is there some way that I can try to remount /sys so that maybe it will be marked as read/write again?


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