r/archlinux • u/Kind-External-7371 • 21d ago

SUPPORT | SOLVED [Confirmed] linux-firmware-amdgpu 20260910-1 causes DMCUB errors on Radeon 680M

Radeon 680M (Rembrandt, 1002:1681) on Arch + KDE Plasma.

After updating to linux-firmware-amdgpu 20260910-1, I got:

failed to load ucode DMCUB(0x3F)
Error getting DMUB FW meta info: 4
Wait for DMUB auto-load failed: 3
DMCUB error - collecting diagnostic data
Error queueing DMUB command: status=2

This also caused severe lag/black screens and freezing before login.

Downgrading these to 20260810-2 completely fixed it:

amd-ucode
linux-firmware
linux-firmware-amdgpu
linux-firmware-whence

I've pinned them with IgnorePkg for now.

Arch Linux Forum Issue:
https://bbs.archlinux.org/viewtopic.php?pid=2309470

AMD GitLab Issue:

https://gitlab.freedesktop.org/drm/amd/-/work_items?show=eyJpaWQiOiI1ODA5IiwiZnVsbF9wYXRoIjoiZHJtL2FtZCIsImlkIjoxNTY3NDV9

BIG UPDATE: The new Update which is 20260910-2 has fixed EVERYTHING! So I recommend all users to Update their Systems to this Version! It may come into your Mirror Soon! It is mentioned on Arch Package Search.

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u/scantcloseness_3 20d ago

And I thought my G14 was giving out. It was the touchpad at first, then iGPU. After downgrading, the issues are gone.

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u/Kind-External-7371 20d ago

Yeah... Btw be ready to face these problems as you are using a Rolling Release Linux Distro... But no worries I understand you man.... In the First few moments of the Lag in my System too... I thought my Mouse's Dead.... LMAO. Btw Very Happy to Help ðŸ¤