Re: No console anymore. How to figure this out.

Dale,

I am cleaning up kernels and had 6.12.58 still on this machine.

I reset the config to the default (removed .config) so only the Intel 
driver is present and you can see TTM_HELPER is NOT present:

zeus /usr/src/linux-6.12.58-gentoo # grep -i ttm .config
CONFIG_DRM=y
CONFIG_DRM_MIPI_DSI=y
CONFIG_DRM_KMS_HELPER=y
CONFIG_DRM_DISPLAY_HELPER=y
CONFIG_DRM_DISPLAY_DP_HELPER=y
CONFIG_DRM_DISPLAY_HDCP_HELPER=y
CONFIG_DRM_DISPLAY_HDMI_HELPER=y
CONFIG_DRM_TTM=y
CONFIG_DRM_BUDDY=y
CONFIG_DRM_GEM_SHMEM_HELPER=y
CONFIG_DRM_I915=y
CONFIG_DRM_I915_FORCE_PROBE=""
CONFIG_DRM_I915_CAPTURE_ERROR=y
CONFIG_DRM_I915_COMPRESS_ERROR=y
CONFIG_DRM_I915_USERPTR=y
CONFIG_DRM_I915_REQUEST_TIMEOUT=20000
CONFIG_DRM_I915_FENCE_TIMEOUT=10000
CONFIG_DRM_I915_USERFAULT_AUTOSUSPEND=250
CONFIG_DRM_I915_HEARTBEAT_INTERVAL=2500
CONFIG_DRM_I915_PREEMPT_TIMEOUT=640
CONFIG_DRM_I915_PREEMPT_TIMEOUT_COMPUTE=7500
CONFIG_DRM_I915_MAX_REQUEST_BUSYWAIT=8000
CONFIG_DRM_I915_STOP_TIMEOUT=100
CONFIG_DRM_I915_TIMESLICE_DURATION=1
CONFIG_DRM_VIRTIO_GPU=y
CONFIG_DRM_VIRTIO_GPU_KMS=y
CONFIG_DRM_PANEL=y
CONFIG_DRM_BRIDGE=y
CONFIG_DRM_PANEL_BRIDGE=y
CONFIG_DRM_PANEL_ORIENTATION_QUIRKS=y


Then I set amdgpu as a module and both TTM and TTM_HELPER are built:
zeus /usr/src/linux-6.12.58-gentoo # grep -i drm .config | grep -v "^#"
CONFIG_DRM=y
CONFIG_DRM_MIPI_DSI=y
CONFIG_DRM_KMS_HELPER=y
CONFIG_DRM_DISPLAY_HELPER=y
CONFIG_DRM_DISPLAY_DP_HELPER=y
CONFIG_DRM_DISPLAY_HDCP_HELPER=y
CONFIG_DRM_DISPLAY_HDMI_HELPER=y
CONFIG_DRM_TTM=y
CONFIG_DRM_EXEC=m
CONFIG_DRM_BUDDY=y
CONFIG_DRM_TTM_HELPER=m
CONFIG_DRM_GEM_SHMEM_HELPER=y
CONFIG_DRM_SUBALLOC_HELPER=m
CONFIG_DRM_SCHED=m
CONFIG_DRM_AMDGPU=m
CONFIG_DRM_AMD_DC=y
CONFIG_DRM_AMD_DC_FP=y
CONFIG_DRM_I915=y
CONFIG_DRM_I915_FORCE_PROBE=""
CONFIG_DRM_I915_CAPTURE_ERROR=y
CONFIG_DRM_I915_COMPRESS_ERROR=y
CONFIG_DRM_I915_USERPTR=y
CONFIG_DRM_I915_REQUEST_TIMEOUT=20000
CONFIG_DRM_I915_FENCE_TIMEOUT=10000
CONFIG_DRM_I915_USERFAULT_AUTOSUSPEND=250
CONFIG_DRM_I915_HEARTBEAT_INTERVAL=2500
CONFIG_DRM_I915_PREEMPT_TIMEOUT=640
CONFIG_DRM_I915_PREEMPT_TIMEOUT_COMPUTE=7500
CONFIG_DRM_I915_MAX_REQUEST_BUSYWAIT=8000
CONFIG_DRM_I915_STOP_TIMEOUT=100
CONFIG_DRM_I915_TIMESLICE_DURATION=1
CONFIG_DRM_VIRTIO_GPU=y
CONFIG_DRM_VIRTIO_GPU_KMS=y
CONFIG_DRM_PANEL=y
CONFIG_DRM_BRIDGE=y
CONFIG_DRM_PANEL_BRIDGE=y
CONFIG_DRM_PANEL_ORIENTATION_QUIRKS=y


So it is not on by default. It's only pulled in drivers that require it.

By the way, I fought with this for three days on and off before I 
stumbled on that nvidia developer thread!

I'm certain this will solve your problem. But you have to build a module 
you have no need for.

Dan


On 3/22/26 9:36 AM, Dale wrote:
> On 3/22/26 11:22 AM, Dale wrote:
>> On 3/22/26 10:34 AM, Daniel Frey wrote:
>>> Hi Dale,
>>>
>>> I found the link that discusses this:
>>>
>>> https://forums.developer.nvidia.com/t/drm-fbdev-wayland-presentation- 
>>> support-with-linux-kernel-6-11-and-above/307920
>>>
>>> Dan
>>
>> Dang, that thread was a while ago.  I wonder why I'm hitting this 
>> now?  It sounds like there is some sort of a fix that was supposed to 
>> prevent this but maybe the TTM thing is the fix?????  They talk about 
>> different versions but I suspect some code trickles to all the 
>> versions at some point.  Maybe my series just took a while.
>>
>> Thanks for the info.  I haven't rebooted yet but will go dig into this 
>> kernel option as soon as I can.  I have two older version of kernels 
>> that I would need to redo as well.
>>
>> Dale
>>
>> :-)  :-)
> 
> 
> I took a quick peek and found this.
> 
> 
> Symbol: DRM_TTM [=y]
> Symbol: DRM_TTM_HELPER [=y]
> 
> 
> It seems it is on by default.  I don't recall ever hearing of this 
> driver.  I'm not sure what this means tho.  Does it mean this isn't the 
> problem or am I missing some other piece somewhere????  I guess when I 
> reboot, that may shed some more light on this problem.
> 
> Why would Nvidia break the console tho?????
> 
> Dale
> 
> :-)  :-)
>