Hi
Am 22.10.25 um 10:08 schrieb Peter Schneider:
Hi Thomas,
thanks very much for your quick response!
(adding Thorsten to CC)
Am 22.10.2025 um 08:51 schrieb Thomas Zimmermann:
Hi
Am 22.10.25 um 05:27 schrieb Peter Schneider:
#regzbot introduced: 6f719373b943a955fee6fc2012aed207b65e2854
Hi all,
I have encountered a serious (for me) regression with 6.18-rc2 on my 2-socket Ivy Bridge Xeon E5-2697 v2 server. After booting, my console screen goes blank and stays blank. 6.18-rc1 was still fine.
The machine has an Asus Z9PE-D16 server mainboard with an onboard ASpeed AST2300 VGA chip with 16MB VRAM. I have attached an older HP Monitor to it via old VGA jack/cable. It also has a second graphics card in a PCI-E slot; an older NVidia GTX 560. It is not connected to a monitor, but I have configured it via kernel command line for PCI-pass- through to VMs running on this server (I use Proxmox VE, i.e. QEMU/KVM virtual machines). Currently, no VMs use this yet, and also no VMs are autostarting with machine boot. So when this regression occurs, the server is idle. Pressing a key on the keyboard does not make the screen come alive. The server is running fine though, and I can access it via SSH. It just has no graphic output anymore. In case this is important, the machine also has a ASMB6 BMC (can be used via http).
I have attached dmesg output from both 6.18-rc1 which is fine, and 6.18-rc2 which exhibits this bug. I have bisected the issue, please see attached git bisect.log.
Thanks for the detailed bug report.
Attached is a patch that partially reverts the broken commit. Could you please apply it on top of the broken kernel and report on the results?
Best regards Thomas
Your patch applied cleanly against 6.18-rc2 and the kernel built fine, but unfortunately it did not solve the issue: my console screen stays blank after booting. This is regardless whether I do a soft reboot, press the reset button or power cycle and do a cold boot. They are all the same.
Just to be sure: you do see output at the early boot stages (BIOS, boot loader). It's at some later point during boot, the driver loads and the display blanks out?
There's another patch attached. does this make a difference?
Best regards Thomas
Beste Grüße, Peter Schneider