Re: Macbook 5,1 Ubuntu Lucid resume issue

["Rafael J. Wysocki" <rjw@sisk.pl>]

On Thursday 04 February 2010, Chase Douglas wrote:
> Hello all,
> 
> I'm testing resume from s3 suspend on Ubuntu Lucid on my macbook
> (version 5,1; nvidia MCP 79 internals). On Ubuntu Karmic, resume
> (usually) works without a hitch. However, on Lucid when I resume the
> disk resumes and the system is partly running, but the display
> (backlight and LCD I think) and ethernet networking do not come back up.
> This occurs when resuming back to X or to a virtual terminal without X
> started. It occurs whether the nvidia or nv kernel modules are loaded or
> unloaded.
> 
> What is most interesting is the dependent variable in all of this is not
> the kernel but the user-space. If I run Karmic with the Lucid kernel it
> resumes correctly. If I run Lucid with the Karmic kernel it does not
> resume correctly. I have run a script which essentially does:
> 
> 1. suspend (using pm-suspend)
> 2. wait 60 seconds (during which time I resume the machine)
> 3. save dmesg output to the hard disk
> 
> I have pored over the dmesg logs from good and bad resumes, but I
> haven't found anything to suggest what the real issue may be. Right now
> I am at a loss as to what I should try next. Does anyone have any
> thoughts as to what I can try to debug this?

It sounds like the distro is using a specific user-space quirk to handle your
machine.

Please try if the machine can be suspended by "echo mem > /sys/power/state"
and resumed correctly.

Rafael