linux-kernel - kernel 4.19.0 on arm64 raspberry pi disrupts tmux panes on raspberry pi aarch64 only.

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Date:   Mon, 22 Oct 2018 20:40:28 -0400
From:   Mark Anthony Paul Hammond <maphammond@...il.com>
To:     linux-kernel@...r.kernel.org
Subject: kernel 4.19.0 on arm64 raspberry pi disrupts tmux panes on raspberry
 pi aarch64 only.

I've been running Debian Sid (unstable) on a Raspberry Pi 3B+. The 4.18 
kernel series made it possible for me to finally get the Ethernet eth0 
to work, thank you. The native wireless did not work so I added USB 
dongles and the kernel 4.18 and 4.19-rc's would cause kernel panics on 
boot up and would only boot if I unplugged the wireless dongles. The 
4.19 series would however, tolerate the wifi dongles if inserted after 
the booting process. However, the kernel would become unstable depending 
what v4.19-rc* one used. Wireless seems to be stable so far with the 
current stable v4.19.0. My main concern is, that, even though I tested 
all the v4.19-rc's I always reverted to the 4.18 series because, using 
the aarch64 arch, on the Raspberry Pi I use the console exclusively, for 
obvious reasons, it is quicker. The problem started with the 
introduction of the 4.19-rc's. I use tmux and I noticed since day one, 
v4.19-rc1 that when I would switch from one window to another, 
especially to a window with four panes the text from the previous window 
would remain, be transferred to the arriving window to the panes on the 
left side of the screen. I hoped that this would be resolved once 
v4.19.0 became stable and established but upon building the kernel this 
morning, the issue is still present. It seems to be an anomaly only 
affecting the arm64 port because all my x86 machines react normally with 
the 4.19 series kernels running tmux, it only affects my Pi machines 
running arm64 linux kernels since v4.19-rc1. Thank you I hope someone 
can point me to a solution. It takes 8 hours to rebuild a kernel with 
all the modules one could hope to encounter on a Raspberry pi, and 3 
hours for a kernel with only specific modules, just in case anyone 
cared. Thanks for your time and help.

Mark Anthony Paul Hammond.