RockPro64 linux console video mode
#1
Hi,

I have a weird issue with the linux console.  I am trying to setup a rockpro64 and in doing that I am using an old Dell monitor with a 1680x1050 resolution.

When the rockpro64 boots, the first thing that I see is the output from uboot. This is OK. Then linux is booted and for a short time I see a patterned screen. After this, there is the linux boot output.

The issue is that as soon as uboot gives control to the linux kernel, the display becomes terrible: all trembling and slightly distorted. The monitor reports that the output is at 1400x1050@55Hz, which is obviously not correct. However, /sys/class/graphics/fb0/modes correctly shows U:1680x1050p-0.

Obviously, I suspect that the poor display is due to using an output format that is not suited for the monitor. However:
  • Why does uboot pick the right display mode and linux does not?
  • What would be the proper way to instruct linux to use a more correct display mode for its console?

Note that the issue seems to be cross-distro (tested with debian and manjaro).

Thanks for any help,
  Reply


Possibly Related Threads…
Thread Author Replies Views Last Post
  irradium (based on crux linux) RockPro64 riscv64, aarch64 mara 1 342 03-25-2024, 12:12 PM
Last Post: mara
  yocto for RockPro64 Fide 1 647 01-16-2024, 10:01 AM
Last Post: Fide
  Installing Ubuntu Server on RockPro64 deutschlmao 2 2,517 10-29-2023, 04:43 PM
Last Post: brotherj4mes
Exclamation Ethernet regression on Linux Kernel 6.5.4? Deathcrow 3 742 09-22-2023, 04:27 AM
Last Post: diederik
  Vanilla mainline Debian 11 (Bullseye) on the RockPro64 Pete Tandy 22 16,819 08-16-2023, 01:34 AM
Last Post: varac
  slarm64 (unofficial slackware) ROCKPro64 RK3399 (aarch64) mara 54 82,186 08-11-2023, 11:13 AM
Last Post: mara
  Installing CH431SER on Ayufan 0.9.14: gitlab-ci-linux-build-159 Thisone 4 1,182 07-14-2023, 04:22 AM
Last Post: hunderteins
  How to enable CoreSight ETM trace on RockPro64 shpark 0 538 05-21-2023, 11:34 PM
Last Post: shpark
  USB3 xhci-hcd in SuperSpeed mode swan 0 465 05-11-2023, 05:35 AM
Last Post: swan
  Linux laptop does not detect the board when plugged in via USB soupy 1 3,918 04-13-2023, 03:01 AM
Last Post: Reynold Grady

Forum Jump:


Users browsing this thread: 1 Guest(s)