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normal post Форум Автор Тема: Large battery drain on Corporate/University WiFi
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xx Форум Large battery drain on Corporate/University WiFi
 June 19, 2018, 21:26


On my university network with the WiFi on and connected, the device stays awake constantly and never enters deep sleep. As far as I can tell, it's multicast traffic that is keeping the device awake.
I've been able to fix the problem by recompiling a modified version of civato's old SphereEngine kernel for JB. By removing the line "DHDCFLAGS += -DBLOCK_IPV6_PACKET -DPASS_IPV4_SUSPEND" in drivers/net/wireless/bcmdhd/Makefile the device will not wake up to process multicast packets (and it also enables IPv6 in the kernel, of course). With this change, the device is finally nearly always in Deep Sleep when unused. It makes a dramatic difference for battery life.
However, I'd like to avoid having to recompile a new kernel to apply this fix. Is there any way to patch an existing kernel or use config files to disable multicast receipt when asleep?

Any help will be apprecited.

I didn't find the right solution from the Internet.



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Thank you.

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