Fix No Screen after login to Desktop on sku with 3840x2400 panel

Bug #1954728 reported by koba
10
This bug affects 1 person
Affects Status Importance Assigned to Milestone
HWE Next
Fix Released
Undecided
Unassigned
OEM Priority Project
Fix Released
Critical
Unassigned
linux (Ubuntu)
Invalid
Undecided
koba
Focal
Invalid
Undecided
Unassigned
Jammy
Invalid
Undecided
koba
linux-oem-5.14 (Ubuntu)
Invalid
Undecided
Unassigned
Focal
Fix Released
Undecided
koba
Jammy
Invalid
Undecided
Unassigned

Bug Description

[Impact]
Got kernel report CPU pipe A FIFO underrun: soft,transcoder
kernel: i915 0000:00:02.0: [drm] *ERROR* CPU pipe A FIFO underrun: soft,transcoder,

[Fix]
Fix has been landed on linux-next, 4fe7907f3775(drm/i915/display/adlp: Disable underrun recovery).
Defeature the underrun feature for intel display gen13+.

[Test Case]
1. change resolution to 3840x2400
2. monitor works well and doesn't black out.

[Where problems could occur]
low

koba (kobako)
Changed in linux (Ubuntu Jammy):
assignee: nobody → koba (kobako)
status: New → In Progress
Changed in linux-oem-5.14 (Ubuntu Focal):
assignee: nobody → koba (kobako)
status: New → In Progress
description: updated
koba (kobako)
tags: added: oem-priority originate-from-1947298 somerville
description: updated
tags: added: originate-from-1952194
Changed in oem-priority:
importance: Undecided → Critical
status: New → In Progress
Revision history for this message
Yuan-Chen Cheng (ycheng-twn) wrote :
Revision history for this message
Kai-Chuan Hsieh (kchsieh) wrote :

I test the test kernel built by Koba, https://drive.google.com/drive/folders/10ns_2dnmPRf091L3LABpIh680kStvTk4?usp=sharing

sku: FPA-DVT2-C6
BIOS: 0.0.26

It still have the error in kernel, but the screen can show successfully. I tried pure 5.14.0-1011-oem, the issue is still reproduced. Therefore, I think the patch set indeed fix something, but it won't get rid off "kernel: i915 0000:00:02.0: [drm] *ERROR* CPU pipe A FIFO underrun: soft,transcoder," however, my local build drmtip [1] can eliminate the error message.

[1] https://drive.google.com/drive/folders/1nS8Vm1SFLCvPPQJiQdFzthsia_FG6yFC?usp=sharing

@koba

Would you please check if it includes all required patch? Currently, we have some problem on other platform STRADL-DVT2-C4/C5B, it will cause it failed to suspend/resume.

Revision history for this message
Kai-Chuan Hsieh (kchsieh) wrote :

Upload log for #2.

Revision history for this message
koba (kobako) wrote (last edit ):

During i switched 2k to 4k multiple times, didn't get the error.
after idle 2~3 hours and keep in 4k, i found the underrun error would be shown up.
but 4k works well

Timo Aaltonen (tjaalton)
Changed in linux-oem-5.14 (Ubuntu Focal):
status: In Progress → Fix Committed
Revision history for this message
Ubuntu Kernel Bot (ubuntu-kernel-bot) wrote :

This bug is awaiting verification that the linux-oem-5.14/5.14.0-1012.12 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-focal' to 'verification-done-focal'. If the problem still exists, change the tag 'verification-needed-focal' to 'verification-failed-focal'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

tags: added: verification-needed-focal
Revision history for this message
Kai-Chuan Hsieh (kchsieh) wrote :

Verify on FPA-DVT1-C6, the kernel fix no screen issue.

tags: added: verification-done-focal
removed: verification-needed-focal
Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package linux-oem-5.14 - 5.14.0-1013.13

---------------
linux-oem-5.14 (5.14.0-1013.13) focal; urgency=medium

  * focal/linux-oem-5.14: 5.14.0-1013.13 -proposed tracker (LP: #1955464)

  * devices on thunderbolt dock are not recognized on adl-p platform
    (LP: #1955016)
    - SAUCE: thunderbolt: Runtime PM activate both ends of the device link
    - SAUCE: thunderbolt: Tear down existing tunnels when resuming from hibernate
    - SAUCE: thunderbolt: Runtime resume USB4 port when retimers are scanned
    - SAUCE: thunderbolt: Do not allow subtracting more NFC credits than
      configured
    - SAUCE: thunderbolt: Do not program path HopIDs for USB4 routers
    - SAUCE: thunderbolt: Add debug logging of DisplayPort resource allocation

 -- Chia-Lin Kao (AceLan) <email address hidden> Tue, 21 Dec 2021 16:59:25 +0800

Changed in linux-oem-5.14 (Ubuntu Focal):
status: Fix Committed → Fix Released
Revision history for this message
Timo Aaltonen (tjaalton) wrote :

this is merged to other oem-5.14 forward-ports for jammy, see bug 1960298

Changed in linux (Ubuntu Jammy):
status: In Progress → Invalid
Changed in linux-oem-5.14 (Ubuntu Jammy):
status: New → Invalid
Changed in linux (Ubuntu Focal):
status: New → Invalid
Timo Aaltonen (tjaalton)
Changed in hwe-next:
status: New → Fix Released
Changed in oem-priority:
status: In Progress → Fix Released
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