I'm posting here because, although I'm using regular Ubuntu (to comply with company policies), I run Plasma with Kubuntu backports, so please bear with me if if this is not the right place to ask.
My laptop has an AMD Ryzen 7 5800H processor with a Radeon APU and a dedicated GeForce RTX 3060 Mobile. I always work on my desk, so laptop is connected to an external monitor (USB-C to DisplayPort cable) and that monitor is connected to a second external monitor (HDMI and Multi-Stream Transport). It’s a work laptop used for coding. It has secure boot and an encrypted LVM volume. After installing Ubuntu upgrades, that seemingly included a 6.2 to 6.5 kernel upgrade, the buitlin monitor stopped working at any resolution but the native one. That's tiny for me, and I'm using X11 so I cannot have per-monitor scaling. Whenever I try to lower it, I only get flickering white noise.
Trying different solutions I read in online forums, I only managed to misconfigure X11 altogether for all three monitors. Right now, I'm back to the scenario I described: all monitors work, but I'm stuck with tiny native resolution in builtin panel. I couldn't manage to revert the kernel upgrade, but if I start with 6.2 kernel using Grub menu, the problem persist anyway.
I've learnt that, apparently, the external monitors are handled by Nvidia card and builtin monitor is handled by Radeon, and it's this one at fault. I tried to get drivers from https://www.amd.com/es/support/linux-drivers but they won't install:
What troubleshooting can I do?
My laptop has an AMD Ryzen 7 5800H processor with a Radeon APU and a dedicated GeForce RTX 3060 Mobile. I always work on my desk, so laptop is connected to an external monitor (USB-C to DisplayPort cable) and that monitor is connected to a second external monitor (HDMI and Multi-Stream Transport). It’s a work laptop used for coding. It has secure boot and an encrypted LVM volume. After installing Ubuntu upgrades, that seemingly included a 6.2 to 6.5 kernel upgrade, the buitlin monitor stopped working at any resolution but the native one. That's tiny for me, and I'm using X11 so I cannot have per-monitor scaling. Whenever I try to lower it, I only get flickering white noise.
Trying different solutions I read in online forums, I only managed to misconfigure X11 altogether for all three monitors. Right now, I'm back to the scenario I described: all monitors work, but I'm stuck with tiny native resolution in builtin panel. I couldn't manage to revert the kernel upgrade, but if I start with 6.2 kernel using Grub menu, the problem persist anyway.
I've learnt that, apparently, the external monitors are handled by Nvidia card and builtin monitor is handled by Radeon, and it's this one at fault. I tried to get drivers from https://www.amd.com/es/support/linux-drivers but they won't install:
Code:
[...] Setting up rocm-clang-ocl (0.5.0.50700-63~22.04) ... Setting up rocm-utils (5.7.0.50700-63~22.04) ... Errors were encountered while processing: amdgpu-dkms E: Sub-process /usr/bin/dpkg returned an error code (1)
Comment