Mark Lord wrote:
quoted text
>
> When I rebuilt with all debug stuff on, the kernel was worse than
> before, and just gave the "black screen of nothing" on resume,
> with a hung system.
> 
> At least before the system didn't hang.
> 
> Now I've just booted with a differently configured kernel,
> with only about half of the debug flags turned on.
> This one resumes from suspend, and *with* working USB too.
> 
> Ugh. Gotta love it when the bug is so subtle that turning on
> the debug flags makes it (1) get worse, and/or (2) get cured.
> 
> Here's the abbreviated diff between broken (no USB on resume, no hang),
> and working (good USB, no hang) .config files.
..
quoted text
> -CONFIG_RTC_CLASS=y
> +# CONFIG_RTC_CLASS is not set

Mmm.. also had the RTC conflict resolved in that one.
Time to try another kernel with just the RTC change now.
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