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uname -a
Linux debian 4.17.1 #1 SMP Fri Jun 15 13:24:38 CEST 2018 x86_64 GNU/Linux
I compiled the upstream kernel from source and installed firmware, including wl module from stretch-backports. Disabling debugging by using
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scripts/config --disable DEBUG_INFO
saved a lot of compile time, so it compiled in about 1h and 25 min.
I wanted to try out new power-saving feature.
My CPU is fluctuating between 0 and 55% for no apparent reason, and my hard drive is being active while doing nothing. As a result, battery is draining, fast. Surprisingly, Broadcom wi-fi card is working.
In short, try not to do this at home and stick to the Debian's kernel
I will try to remove intel-microcode, see if that helps.
Update: It seems to have been stable after installing stretch's microcode, not the one from backports. HDD activity is normal.
Update2: Removing microcode again, CPU seems to be at 100% sometimes when playing 720p+ videos on Youtube. This benchmarking is troublesome indeed.
And what-do-you-know, it worked.