[OpenWrt-Devel] [PATCH] mvebu: disable CPU_IDLE as a Mamba instability workaround

Felix Fietkau nbd at nbd.name
Mon Mar 19 17:14:42 EDT 2018

On 2018-03-19 10:51, Bjørn Mork wrote:
> A regression seriously affecting the Linksys WRT1900ACv1 (Mamba) was
> introduced some time between the OpenWrti/LEDE v4.4 and v4.9 kernels.
> The root cause has not yet been identified, despite many attempts for
> more than a year.  However, disabling CPU_IDLE, and implicitly CPU_PM,
> has been proven to be an effective workaround.
> The symptoms on an affected system are unwanted reboots a a variable
> frequency. In many cases almost immediately after boot, causing a
> bootloop.  This effectively disables support for Mamba on OpenWrt
> with kernels > v4.4.
> Disabling CPU_IDLE for now to reenable Mamba support.
> Link: https://forum.lede-project.org/t/wrt1900acv1-reboots-kernel-4-9/2025
> Signed-off-by: Bjørn Mork <bjorn at mork.no>
Please try this variant instead, which should not affect unrelated devices:

It's in my staging tree at


- Felix
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