Arch Linux

l1ivi1l

Member

Registered: 2025-01-09

Posts: 28

[SOLVED] ^@ spam in stderr in archiso

Bought a new laptop and booted up archiso. It seems that every commands output gets spammed by "^@". It also seems that it gets spammed into stderr but only when there is a non-bg process currently running. For example, when I ran "ping archlinux.org", it continuously wrote these characters, but when I did "echo $(ping archlinux.org -c 8)", it had only been printing them until echo finally wrote its output.

Last edited by l1ivi1l (2025-05-05 18:10:03)

l1ivi1l

Member

Registered: 2025-01-09

Posts: 28

Re: [SOLVED] ^@ spam in stderr in archiso

The iso I use is archlinux-2025.05.01-x86_64.iso from yandex mirror

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 25,157

Re: [SOLVED] ^@ spam in stderr in archiso

That's the null Character and likely some input device generating spurious events. In most cases you should be able to ignore it until after the install if you switch to a different VT with Ctrl+Alt+F2 or so. Otherwise you could try blacklisting some common offenders' modules, e.g. checking dmesg or so potentially the touchpad driver or what can also be very common wmi modules for the function keys of laptops, e.g. asus-wmi and friends, what laptop model is this exactly? What can also often help with misbehavior here is a UEFI update.

l1ivi1l

Member

Registered: 2025-01-09

Posts: 28

Re: [SOLVED] ^@ spam in stderr in archiso

The laptop is honor magicbook x16 plus 2025, it has three specific keys on fn+f10, f11, f12, I suspect them. I've also tried endeavoros live usb and it spammed ^@ in tty there as well.

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 75,307

Re: [SOLVED] ^@ spam in stderr in archiso

This could be some random stuff, eg. webcams often have keybaord devices.
"evtest" or "libinput debug-events" will tell where this is coming from and then please try to post the dmesg

dmesg | curl -F 'file=@-' 0x0.st # requires working network

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l1ivi1l

Member

Registered: 2025-01-09

Posts: 28

Re: [SOLVED] ^@ spam in stderr in archiso

https://0x0.st/8JX8.txt

Will try debugging with libinput in endeavoros live usb since it's not in archiso

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 75,307

Re: [SOLVED] ^@ spam in stderr in archiso

libinput in endeavoros live usb since it's not in archiso

:colbertemoji:

"module_blacklist=huawei-wmi", https://wiki.archlinux.org/title/Kernel … and_line_2

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How to upload text · How to boot w/o GUI · Disable Windows Fast-Start! · Fix your xinitrc

l1ivi1l

Member

Registered: 2025-01-09

Posts: 28

Re: [SOLVED] ^@ spam in stderr in archiso

The kernel option didn't help but I've found another solution.
https://www.linux.org.ru/forum/linux-ha … d=17327853 (in Russian)

It seems to have fixed my problem