Public bug reported:
System: AMD Radeon RX 6900 XT (SIENNA_CICHLID, PCI ID 1002:73BF)
OS: Linux Mint 22.3 Cinnamon (based on Ubuntu Noble)
Kernel tested: 7.0.0-28-generic (also reproduced on 6.14.0-37-generic)
Working version: linux-firmware 20240318.git3b128b60-0ubuntu2.26
Broken version: linux-firmware 20240318.git3b128b60-0ubuntu2.29
Symptoms after upgrading to .29:
1. Full black screen on boot. dmesg showed:
"KHO: Failed to reserve lowmem scratch buffer"
"amdgpu 0000:03:00.0: probe with driver amdgpu failed with error -22"
2. After adding kho=off boot parameter, amdgpu probed successfully
(all IP blocks detected, VRAM/GTT initialized, DMUB firmware loaded),
but display output failed with:
"[drm] Failed to setup vendor infoframe on connector HDMI-A-3: -22"
"[drm:dcn20_wait_for_blank_complete [amdgpu]] *ERROR* DC: failed to blank
crtc!"
"amdgpu 0000:03:00.0: SMU: No response msg_reg: 22 resp_reg: 0"
"REG_WAIT timeout 1us * 100000 tries - optc1_wait_for_state"
Xorg crashed repeatedly (systemd-coredump caught 2 separate Xorg crashes).
Resolution: Downgrading linux-firmware to .26 and holding the package
(apt-mark hold) fully resolved both issues — clean boot at full
resolution on dual monitors, no boot parameters needed.
Steps to reproduce:
1. Have RX 6900 XT with dual monitor setup (DisplayPort + HDMI)
2. Upgrade linux-firmware from .26/.27 to .29
3. Reboot
4. Black screen after boot logo
** Affects: linux-firmware (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2163366
Title:
amdgpu probe fails (-22) / Xorg crashes after linux-firmware 2.29
update on RX 6900 XT
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