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35a32c5
(Get the code!)
Hi Herton,
Tried the latest kernel you uploaded, and I'm seeing the same behavior (blank video on resume).
I tried the following: with the system in that state, I asked it to suspend (not hibernate). On resuming from the *second* suspend, the backlight turns on fine and the system works normally. I went back to the -4 kernel we tested the other day, and I confirmed it has this behavior too, i.e. the first suspend attempt fails to restore screen backlight upon resuming, but the *second* attempt succeeds. This information will hopefully be helpful. This however is behavior that will baffle users, so I don't think we can even call this a valid workaround, the problem still remains.
I'm attaching a dmesg file containing the two suspend/resume series of events. Also if there's any other procedure or information that might be helpful with this problem, please don't hesitate to ask; this system is used mainly for testing Ubuntu.