this post was submitted on 23 Nov 2023
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Noticed a strange occurrence where my monitor buttons will not react to presses when certain conditions are met (aussie.zone)
submitted 11 months ago by root@aussie.zone to c/linux@lemmy.ml
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I have an Acer XV340CKP monitor connected via Display Port to my GPU. I also have a old LG W2253TQ that I use as a secondary display. It only has a DVI and VGA port. I have a DVI-DVI cable together with a DVI-Display Port converter to connect to my GPU, which is an Asus RX6900XT. I am running Nobara 38.

I have observed that if I were to have my Acer monitor powered when I switch on my desktop, all the monitor buttons do not respond. None of the menu buttons, not even the power button responds. When I switch off the desktop, the monitor stays on. The only way to power it down is to unplug the power cable.

However, if I were to only have the LG monitor powered when I switch on my desktop, all the buttons on the Acer monitor works.

I believe everything was working previously in Nobara 37. I think this issue probably started happening in the recent month or two.

Is this even possible, where the graphics card sends a malformed signal to the monitor and prevents the buttons from working?

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[–] root@aussie.zone 2 points 11 months ago (1 children)

Very interesting. The Asus monitor is probably only 2 years old. It does work fine standalone with a spare laptop of mine that is running Windows 10 though.

[–] 0x4E4F@infosec.pub 1 points 11 months ago (1 children)

Have you tried to replicate this behavior in Windows? Try it with a spare drive, see if you get the same irrational thing happening in Windows. If it happens, yeah, it's a hardware problem 😉... most probably bad caps. Bad batch maybe, even though it's only 2 years old, who knows.

[–] root@aussie.zone 1 points 11 months ago (1 children)

I did not try replicating this behavior with a Windows install on my desktop. I did however perform a fresh install of Fedora 39 and that appeared to have fixed the issue, which is good news.

[–] 0x4E4F@infosec.pub 2 points 11 months ago

Well, it's not a hardware problem in that case 😉. Good thing you fixed it 👍.