Definitely seems to be brcm-driver related; I swapped my card for an intel 8260
and everything works like a charm.
If any logs are needed I can provide from my macbook pro with the same issue.
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I've tried kernel 4.6rc3 to no avail (same machine, Dell XPS 13 9350).
The thing has the broadcom 4350 card.
I'm running a 4.4 lowlatency kernel on this machine, which is not
upgraded automatically or anything, so the problem can IMHO not come
from a kernel change, but it must be something network
Somehow the bug doesn't seem to affect kernel 4.0 (rc6)
I just installed that and now suspend/resume works like a charm.
Looks like it's a combination of components that causes this erratic
behaviour.
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After some further testing I've been able to save the following from
dmesg after resume:
[ 2195.742519] Modules linked in: nvram msr binfmt_misc rfcomm bnep
nls_iso8859_1 uvcvideo videobuf2_vmalloc btusb videobuf2_memops videobuf2_core
bluetooth v4l2_common videodev usbhid media snd_hda_codec_hd
Same on my XPS-13 9343 with i7-5500U and identical graphics card.
I tried xorg-edgers, but no improvement (xorg-video-intel is version 2.99.917
there), it shows the same behaviour.
Workaround with UXA is possible, but performance is abysmal, so no real
solution.
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