[Ubuntu-22.04] Video mode is not working with the external monitor

[Gnanendra Kolla]

Description:
The SUT Dell EMC Poweredge R440 can not display video mode with external monitor when Ubuntu 22.04 boots. The video mode working properly under iDRAC virtual console.

Steps to Reproduce:
1. Connect External monitor to SUT using VGA cable.
2. Mount ubuntu-22.04-live-server-amd64.iso by iDRAC virtual console.
3. Start to install the OS and click "Try or Install Ubuntu server".
4. The SUT can not display video mode with monitor when OS boots.

Expected Results:
Video mode should work properly when OS boots with external monitor.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1981554

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Gnanendra Kolla (gnanendrakollaa)]

- I have installed GUI and checked the default display resolution was 1280*1024@75Hz---> While booting and
     afterbooting external display not showing anything.
- Changed to display resolution 1152*864@75Hz ---> while booting not able to see content on display but
     Afterboot able to see content in external disaplay.
- if "nomodeset" kernel parameter is passed issue is not reproducible.

Workaround:
- If we install GUI based ubuntu and after OS boot done change display resolution to the 1152*864@75Hz we can
   able to see content on external display.

[Jeff Lane  (bladernr)]

Please do as the kernel bot asks and collect the necessary logs for this bug.

[Gnanendra Kolla (gnanendrakollaa)]

Hello Mr.Jeff Lane,

I have collected the logs and attached as Ubuntu Kernel Bot (ubuntu-kernel-bot) suggested using
 command apport-collect 1981554

[Gnanendra Kolla (gnanendrakollaa)]

Hi

Found following upstream patch - https://github.com/torvalds/linux/commit/40ce1121c1d76daf9048a86e36c83e469281b9fd which seems related to the issue.

i have Applied this patch and and tested issue is fixed.

[Michael Reed (mreed8855)]

HI Gnanendra,

What version of the kernel are you using? This patch from comment #6 appears to already be in jammy

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1969105

[Michael Reed (mreed8855)]

Hi Gnanendra,

If the patch that you found fixed the issue it could possibly be in the daily image. Can you try the daily image to see if it resolves your issue?

http://cdimage.ubuntu.com/cdimage/ubuntu-server/jammy/daily-live/current/

[Gnanendra Kolla (gnanendrakollaa)]

Hi Michael,

I have tried daily build https://cdimage.ubuntu.com/ubuntu-server/jammy/daily-live/

and the issue is got resolved with 22.04.1 daily build.