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Date:   Thu, 29 Aug 2019 12:03:37 +0200
From:   Stanislaw Gruszka <sgruszka@redhat.com>
To:     Sergey Maranchuk <slav0nic0@gmail.com>
Cc:     linux-wireless@vger.kernel.org
Subject: Re: rt2x00: 5Ghz signal power degradation with linux 5.2 kernel
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On Thu, Aug 29, 2019 at 12:42:44PM +0300, Sergey Maranchuk wrote:
> I got some problem after upgrade kernel to 5.2 version (debian testing
> linux-image-5.2.0-2-amd64). 5Ghz client  stopped to see AP.
> Some tests with 1metre distance between client-AP: 2.4Ghz  -22dBm, for
> 5Ghz - 53dBm !, for longer distance (8m + walls) 2.4 - 61dBm, 5Ghz not
> visible.
> All works fine with kernel 4.19 and on windows 10, other devices also
> see AP without any problems with same distance.

After looking on the changlog most possible cause of it seems to be
commit 9ad3b55654455258a9463384edb40077439d879f:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9ad3b55654455258a9463384edb40077439d879f

Please try to revert it, and see if that improve rx signal level. 

It that would not help, please try to narrow regression to two
consecutive kernel versions - it is: 4.19 -> 5.0 or 5.0 -> 5.1
or 5.1 -> 5.2 ?

Stanislaw