Public bug reported:

[Impact]
*** this issue happen with secure boot on and issue gone when secure boot is 
off***

After the BIOS loading screen, a yellow screen pops up in an instant (<
1 second) and then disappears. Attached a demo video.

with the Bug #1945932 SRU, some target machine still got the garbage
frames during bootup.

[Fix]
Need the one more patch to fix, this has been laned on mainline since v5.13-rc1.
1835bf459df7) drm/i915: Wait for scanout to stop when sanitizing planes

[Test]
1. Power on the failed machine.
2. Check if any unusual screen shows before and after the system loading screen.
3. No unusual screen shows before and after the system loading screen

[Regression Potential]
Medium, but didn't observe the issue on the failed machine.

** Affects: linux-oem-5.10 (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: linux-oem-5.10 (Ubuntu Focal)
     Importance: Undecided
     Assignee: koba (kobako)
         Status: In Progress

** Also affects: linux-oem-5.10 (Ubuntu)
   Importance: Undecided
       Status: New

** No longer affects: linux (Ubuntu)

** Also affects: linux-oem-5.10 (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Changed in: linux-oem-5.10 (Ubuntu Focal)
       Status: New => In Progress

** Changed in: linux-oem-5.10 (Ubuntu Focal)
     Assignee: (unassigned) => koba (kobako)

** Description changed:

  [Impact]
  *** this issue happen with secure boot on and issue gone when secure boot is 
off***
  
  After the BIOS loading screen, a yellow screen pops up in an instant (<
  1 second) and then disappears. Attached a demo video.
  
  with the lp1945932 SRU, some target machine still got the garbage frame
  during bootup.
  
  [Fix]
- Nedd the one more patch to fix, this has been laned on mainline since 
v5.13-rc1.
+ Need the one more patch to fix, this has been laned on mainline since 
v5.13-rc1.
  1835bf459df7) drm/i915: Wait for scanout to stop when sanitizing planes
  
  [Test]
  1. Power on the failed machine.
  2. Check if any unusual screen shows before and after the system loading 
screen.
  3. No unusual screen shows before and after the system loading screen
  
  [Regression Potential]
  Medium, but didn't observe the issue on the failed machine.

** Description changed:

  [Impact]
  *** this issue happen with secure boot on and issue gone when secure boot is 
off***
  
  After the BIOS loading screen, a yellow screen pops up in an instant (<
  1 second) and then disappears. Attached a demo video.
  
- with the lp1945932 SRU, some target machine still got the garbage frame
- during bootup.
+ with the Bug #1945932 SRU, some target machine still got the garbage
+ frame during bootup.
  
  [Fix]
  Need the one more patch to fix, this has been laned on mainline since 
v5.13-rc1.
  1835bf459df7) drm/i915: Wait for scanout to stop when sanitizing planes
  
  [Test]
  1. Power on the failed machine.
  2. Check if any unusual screen shows before and after the system loading 
screen.
  3. No unusual screen shows before and after the system loading screen
  
  [Regression Potential]
  Medium, but didn't observe the issue on the failed machine.

** Description changed:

  [Impact]
  *** this issue happen with secure boot on and issue gone when secure boot is 
off***
  
  After the BIOS loading screen, a yellow screen pops up in an instant (<
  1 second) and then disappears. Attached a demo video.
  
  with the Bug #1945932 SRU, some target machine still got the garbage
- frame during bootup.
+ frames during bootup.
  
  [Fix]
  Need the one more patch to fix, this has been laned on mainline since 
v5.13-rc1.
  1835bf459df7) drm/i915: Wait for scanout to stop when sanitizing planes
  
  [Test]
  1. Power on the failed machine.
  2. Check if any unusual screen shows before and after the system loading 
screen.
  3. No unusual screen shows before and after the system loading screen
  
  [Regression Potential]
  Medium, but didn't observe the issue on the failed machine.

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https://bugs.launchpad.net/bugs/1955692

Title:
  Update - Fix A yellow screen pops up in an instant (< 1 second) and
  then disappears before loading the system

Status in linux-oem-5.10 package in Ubuntu:
  New
Status in linux-oem-5.10 source package in Focal:
  In Progress

Bug description:
  [Impact]
  *** this issue happen with secure boot on and issue gone when secure boot is 
off***

  After the BIOS loading screen, a yellow screen pops up in an instant
  (< 1 second) and then disappears. Attached a demo video.

  with the Bug #1945932 SRU, some target machine still got the garbage
  frames during bootup.

  [Fix]
  Need the one more patch to fix, this has been laned on mainline since 
v5.13-rc1.
  1835bf459df7) drm/i915: Wait for scanout to stop when sanitizing planes

  [Test]
  1. Power on the failed machine.
  2. Check if any unusual screen shows before and after the system loading 
screen.
  3. No unusual screen shows before and after the system loading screen

  [Regression Potential]
  Medium, but didn't observe the issue on the failed machine.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux-oem-5.10/+bug/1955692/+subscriptions


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