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Bug#1101203: linux-image-6.12.19-amd64: Kernel 6.12.19-amd64 fails to connect display to X server




On 28/03/2025 01:02, Ben Hutchings wrote:
Hi,

In bug discussions, please always reply-all, don't just reply to the
sender.

I have another question below.

On Thu, 2025-03-27 at 19:58 +0100, @ wrote:
On 27/03/2025 01:42, Ben Hutchings wrote:
Control: tag -1 moreinfo

On Mon, 24 Mar 2025 21:44:25 +0100 Joe<shannyodo@yahoo.fr> wrote:
[...]
I can't provide kernel log with the reportbug program due to how
sudoer is set, I usually use pkexec or su . I there another way to
transmit the logs if that's useful ?
Let me know if you need more informations.
Please send the kernel log as an attachment.

Also send the kernel log from the working kernel version.

Ben.

Here's the dmesg outputs for 6.12.19 & 6.12.17 .

I have no idea what's wrong, good luck and thank you.
There's an obvious difference in the logs, which is that we have a lot
of messages from the amdgpu driver on 6.12.17 and *none* on 6.12.19. 
That implies it isn't even being loaded, and the device information in
your initial bug report agrees with that.  (The GPU is at PCI address
0000:2d:00.0 and no driver is listed as bound to it.)

I can't see any changes between these versions that would explain this.
But this does look similar to <https://bugs.debian.org/1094767>.  (We
still don't know what actually triggered that but it wasn't a kernel
change.)

Please send the output of the command:

   grep -r amdgpu /etc/modprobe.*

Ben.

$ grep -r amdgpu /etc/modprobe.*

/etc/modprobe.d/blacklist-amdgpu.conf:blacklist amdgpu

Commenting that blacklist out fixed the issue.

Really odd it affected the new kernel but not the older one.

Thank you very much for pointing it out, I had no clue to look up there.

-- Joe


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