Blue lines and screen jittering after any linux boot

I can use my laptop fine, but my screen jitters a lot and shows weird lines.
It is not a hardware related thing, because if i boot from USB or even go to BIOS, the screen is normal, the moment the system starts linux, the screen goes black for some seconds and when it turns back on, the problem starts (Currently on Lubuntu, but this has happened to me on arch on this same computer before and i tried switching).
I have linux-firmware installed that should take care of the drivers, and my gpu seems to be detected correctly, but the screen just jitters.
I think the problem might be related to the bootloader or Grub not setting my gpu settings correctly or something like that.

I can reply with logs or images/videos if needed.

Originally Posted by guilhermicas I can use my laptop fine, but my screen jitters a lot and shows weird lines. It is not a hardware related thing, because if i boot from USB or even go to BIOS, the screen is normal, the moment the system starts linux, the screen goes black for some seconds and when it turns back on, the problem starts (Currently on Lubuntu, but this has happened to me on arch on this same computer before and i tried switching). I have linux-firmware installed that should take care of the drivers, and my gpu seems to be detected correctly, but the screen just jitters. I think the problem might be related to the bootloader or Grub not setting my gpu settings correctly or something like that. I can reply with logs or images/videos if needed.

Somehow i doubt that you manually installed ArchLinux.
Be that as it may, show us

lspci -k | grep -iEA5 'vga|3d|display'

(text, not images/videos)
from the problematic install.

Originally Posted by ondoho Somehow i doubt that you manually installed ArchLinux. Be that as it may, show us lspci -k | grep -iEA5 'vga|3d|display' (text, not images/videos) from the problematic install.

Personally i didn't think it was hard to install arch. Just the after install that at the time left me not knowing what to do (stupid missing fonts and dumb stuff alike)

The output of the command:

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV620/M82 [Mobility Radeon HD 3450/3470]
	Subsystem: ASUSTeK Computer Inc. RV620/M82 [Mobility Radeon HD 3450/3470]
	Kernel driver in use: radeon
	Kernel modules: radeon
02:00.0 Network controller: Qualcomm Atheros AR928X Wireless Network Adapter (PCI-Express) (rev 01)
	Subsystem: AzureWave AW-NE771 802.11bgn Wireless Mini PCIe Card [AR9281]

Mobility Radeon HD 3450/3470

The open source radeon driver might have trouble with a 12 year old AMD GPU. I know this is true for NVIDIA, but nouveau is reverse-engineered, IDK about radeon.
Anyhow.
Usually it is said to be good enough for current cards.
You could look at the journal, maybe it can tell you more. https://wiki.archlinux.org/index.php...roubleshooting
Of course the hardware could also be on its way out, but in my experience some sort of software/driver problem is much more likely.

Originally Posted by ondoho The open source radeon driver might have trouble with a 12 year old AMD GPU. I know this is true for NVIDIA, but nouveau is reverse-engineered, IDK about radeon. Anyhow. Usually it is said to be good enough for current cards. You could look at the journal, maybe it can tell you more. https://wiki.archlinux.org/index.php...roubleshooting Of course the hardware could also be on its way out, but in my experience some sort of software/driver problem is much more likely.

Thank you for the information.
I still think that this problem needs a video to be understood, i've tried to change VSync, change Xorg radeon driver options, with no luck.
I will follow your troubleshooting link along with this ATI driver link https://wiki.archlinux.org/index.php/ATI

It could also be about firmware. radeon often requires additional firmware.
Try to find relevant entries in

dmesg

Maybe you can grep like this:

dmesg | grep -iE 'direct-load|firmware|radeon|ati'