I've got Dell Inspiron 6400 with Ubuntu 16.04, oibaf drivers and kernel 4.7.3. The box doesn't seem to be able to come out of STR - it just hangs with black screen. I've tried 'echo devices > /sys/power/pm_test; echo mem > /sys/power/state' and on resume I often get to see my desktop but then box completely freezes - no keyboard, no mouse, no net. I've tried suspending/resumeing in console mode and could not reproduce this problem. On previous Ubuntu kernels (stock) it hangs often, but sometimes it is able to resume, in 4.7.3 it seems to be handging close to 100% percent of the time. Unfortunately I'm not really able to get any debug logs since box gets totally frozen. Is there any way I can provide any more information or debug this? Thanks!
Can you bisect?
Hi. Thanks for your response! It is somewhat hard because it goes from 'hangs almost always' on ubuntu's 4.4.0 kernel to 'hangs every time' on 4.7.3. Also I assume xorg and its version may play some role in that because it doesn't happen in text console. It also looks like that there is some sort of dependency on how log it was off - 4.4.0 almost never wakes up overnight. I'll try to play with different versions to see if I can find a pattern... I was hoping that there is some way to delay radeon awakening for after I get net and can tail debug logs - so if there are errors it would dump them.
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