Same problem here.
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Environment
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GPU: AMD Radeon RX 6900 XT -- Navi 21 / sienna_cichlid,
PCI 1002:73bf, subsystem ASUS 1043:04f8, bus 03:00.0
OS: Linux Mint 22.3 "Zena" (Ubuntu 24.04 noble base)
Session: X11 / Cinnamon
Kernels: 6.14.0-37, 6.17.0-23/29/35/40, 7.0.0-28 (all -generic, HWE)
-- reproduces on all of them
Mesa: 25.2.8
Displays: 3440x1440 ultrawide on DisplayPort + 1920x1080 on HDMI
AI fixed it by restoring a single file 'sienna_cichlid_dmcub.bin.zst' to
Version 2.26 / 2.27 but ill spare you the full log.
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https://bugs.launchpad.net/bugs/2163303
Title:
[regression] linux-firmware 20240318.git3b128b60-0ubuntu2.29 causes
half-screen corruption/black screens on AMD Navi 21; 0ubuntu2.26 works
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