I have been getting this occasionally since I started using Ubuntu. Does anyone know a fix?
Having used any version of Ubuntu I had always resume/suspend issue. But it can depends on diffrenent kind of video card. So If you have hybrid nvidea + intel video card please do the next:
- Next you need switch in BIOS on only use Intel video card or read the topic about HybridGraphics
- Last thing is using small but working hack with switching graphic mode when laptop suspends and back after it resumes.
- To solve problem with brighness control you need use the manual (compizomania.blogspot.com/2014/06/ubuntu-1404linux-mint-17.html)
If you do not use hybrid or optimal video card you are luckier and only one step that you need to do to install proprietary drivers (nvidia (www.binarytides.com/install-nvidia-drivers-ubuntu-14-04), fglrx (help.ubuntu.com/community/BinaryDriverHowto/AMD))
I agree with Donarsson. The command
iw does deal with wireless devices. Try (as suggested by Donarsson) disabling wireless before suspending. If resume works without issues, confirming the diagnosis, then you can check out the following page to automate unloading before suspend and loading after resume: https://wiki.archlinux.org/index.php/pm-utils#Standby.2Fsuspend_to_RAM
Basically, you need the line
SUSPEND_MODULES="mod1 mod2 mod3..."to the file
/etc/pm/config.d/modules where mod1, mod2, mod3... are the misbehaving modules to be unloaded/loaded.
The list of all modules (wireless and others) can be seen by running the command
lsmod. I'm not completely sure how to find out which of these are to be added to SUSPEND_MODULES. Common wireless modules are
iwlwifi and some realtek drivers beginning with
The problem is your WLAN card, it seems to sometimes not suspend/wake up properly (or not in time), which causes this error. I had a similar issue a while back, it fixed itself after some time (probably some minor update) and I haven't found any helpful documentation about this kind of error. But a good workaround for me was to disable WiFi (via the network indicator) before suspending an enable it after waking up, it should fix the problem.