This bug was fixed in the package linux-firmware -
20250901.git993ff19b-0ubuntu1.2
---------------
linux-firmware (20250901.git993ff19b-0ubuntu1.2) questing; urgency=medium
* No-change rebuild.
linux-firmware (20250901.git993ff19b-0ubuntu1.1) questing;
urgency=medium
* [SRU] Graphics issues at 4K video playback on AMD Krackan Point 2 (LP:
#2123814)
- amdgpu: DMCUB updates for various ASICs
linux-firmware (20250901.git993ff19b-0ubuntu1.0) questing;
urgency=medium
* Initial dummy SRU release.
-- Juerg Haefliger <[email protected]> Mon, 13 Oct 2025
12:10:55 +0200
** Changed in: linux-firmware (Ubuntu Questing)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/2123814
Title:
[SRU] Graphics issues at 4K video playback on AMD Krackan Point 2
Status in linux-firmware package in Ubuntu:
Fix Released
Status in linux-firmware source package in Noble:
Fix Released
Status in linux-firmware source package in Plucky:
Fix Released
Status in linux-firmware source package in Questing:
Fix Released
Bug description:
[ SRU Template ]
[ Impact ]
Abnormal GUI behaviours like window freeze at 4K video playback on AMD
Krackan Point 2 machines.
[ Fix ]
Proposed fix is commit ba7d706f9cf6 ("amdgpu: DMCUB updates for various
ASICs"), which is only in upstream main branch, no any date based tag.
[ Test Plan ]
1. Install proposed linux-firmware package from -proposed pocket,
2. Verification done by manual exam through reported symptoms.
Test on: Sentry MLK 14 AMD and Sentry MLK 16 AMD KRK platforms with QHD
panel
Package version: linux-firmware 20240318.git3b128b60-0ubuntu2.19
Steps:
1. Launch Firefox browser from the desktop or taskbar.
2. In the Firefox address bar, type www.youtube.com and press Enter.
3. Wait for the YouTube homepage to load completely.
4. Click on the YouTube search bar and type 4K video, then press Enter.
5. Browse the search results and select a video labeled as 4K.
6. Click the video thumbnail to start playback.
7. Click the gear icon on the video player to open quality settings.
8. Select 2160p (4K) resolution from the available options.
9. Observe the video playback for at least 30 seconds to verify smooth
performance and accurate display.
10. Open the Snapshot camera application from the Start menu or search bar.
22. Confirm the camera preview is displayed correctly on the QHD panel.
12. Check for proper brightness, contrast, and responsiveness in the
camera preview.
13. Record the result as PASS if both video playback and camera preview
are successful.
Expected results: All tests passed. video playback normally. Camera
function normally.
[ Where problems could occur ]
Opaque binary firmware. Per discussion internally, the original
convention to SRU only minimum set of blobs have caused maintenance
efforts every time we need to update AMD GPU fw blobs. This time, we
pull the commits, along with their history, as well as the histories
of the blobs ever involved. This adds many more commits, which either
have been partially backported following the SRU convention, or the
prerequisites of them. This mean many updates to existing fw have not
received further verification.
[ Other Info ]
Nominate for Questing, Plucky and Noble. For Questing, full commit is
cherry picked.
========== original bug report ==========
Known symptoms include:
1. VP on F6/F7 Key no function
2. VP on HDMI/Type-c Monitor connected can't recognized
3. VP on Caps' LED can't turn on when enter into Suspend
4. VP on video can't play normally
5. VP on display Resolution/Refresh Rate can't change
6. VP on taskbar UI lacks Night light icon
7. VP on pointer will delay when move pointer
8. VP on Camera will show garbage with lid closed/opened
Proposed fix:
https://gitlab.com/kernel-firmware/linux-firmware/-/commit/ba7d706f9cf6e65e9956e65ac44906a78a790a02
("amdgpu: DMCUB updates for various ASICs")
- Firmware release 0.1.27.0
- Tested with DC 3.2.350
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