[Bug 1944397] Re: HDMI does not display anything with Impish RPi desktop image

[Dave Jones]

@satmandu I'm unable to reproduce the complete display failure you're
seeing on impish here, although I can certainly produce the freezing
video failure I mentioned above (and that is still occurring on the
-proposed kernel). Given that a fix for this is unlikely prior to
impish's release I'm currently pondering the pros and cons of switching
at least the desktop image to fkms as a (temporary) workaround.

On hirsute, I'm unable to reproduce either the display failure *or* the
display freeze I'm seeing on impish, which is odd (and suggests that
perhaps there's a different root cause in each).

Is there any chance you (or any other interested party seeing the same
issue) could test the current hirsute kernel to verify that you're
seeing display failure there too and, if you are, whether a test kernel
[1] that Juerg's produced fixes the issue? I've also produced a bump for
the boot firmware which may affect the results (of either hirsute or
impish) in my firmware PPA [2].

The firmware bump seems to affect some of the error messages produced,
but at least in my case it hasn't affected the display freeze (on
impish) so I anticipate it may not affect the display failure issue
either (on either release).

[1] https://kernel.ubuntu.com/~juergh/hirsute-raspi/
[2] https://launchpad.net/~waveform/+archive/ubuntu/firmware/+packages

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to linux-firmware-raspi2 in
Ubuntu.
https://bugs.launchpad.net/bugs/1944397

Title:
  HDMI does not display anything with Impish RPi desktop image

Status in linux-firmware-raspi2 package in Ubuntu:
  Confirmed
Status in linux-raspi package in Ubuntu:
  Fix Committed
Status in linux-raspi source package in Hirsute:
  Confirmed
Status in linux-firmware-raspi2 source package in Impish:
  Confirmed
Status in linux-raspi source package in Impish:
  Fix Committed

Bug description:
  [ Impact ]

  The desktop does not come up and the screen stays blank when using
  'dtoverlay=vc4-kms-v3d' on a Pi 4 (as is the case in raspi desktop
  images). If the desktop does come up, playing video freezes the
  desktop and/or the system. The kernel log shows loads of WARNINGs and
  potentially firmware errors.

  [ Test Case ]

  Use a raspi desktop image, play video (youtube or VLC), move windows
  around, switch to and from fullscreen video playback.

  [ Where problems could occur ]

  The fixes are all local to the VC4 driver so (new) issues should only
  show up when that driver is in use. Potential problems are UI freezes,
  kernel stalls and crashes.

  [ Original Description ]

  Workaround
  ----------
  With media which you will boot off of change the line dtoverlay=vc4-kms-v3d to dtoverlay=vc4-fkms-v3d in /system-boot/config.txt

  Original Description
  --------------------
  Have a HDMI display w/o audio hooked up to this RPI4B.

  With the latest kernel update the screen does not turn on due to this.

  ProblemType: BugDistroRelease: Ubuntu 21.10
  Package: linux-image-5.13.0-1007-raspi 5.13.0-1007.8
  ProcVersionSignature: Ubuntu 5.13.0-1007.8-raspi 5.13.13
  Uname: Linux 5.13.0-1007-raspi aarch64
  ApportVersion: 2.20.11-0ubuntu69
  Architecture: arm64
  CasperMD5CheckResult: unknown
  Date: Mon Sep 20 20:56:14 2021
  ImageMediaBuild: 20210421
  ProcEnviron:
   SHELL=/bin/bash
   LANG=en_US.UTF-8
   TERM=vt100
   XDG_RUNTIME_DIR=<set>
   PATH=(custom, user)SourcePackage: linux-raspi
  UpgradeStatus: Upgraded to impish on 2021-08-17 (34 days ago)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux-firmware-raspi2/+bug/1944397/+subscriptions