Switching VT failed after commit tty: vt: use _IO() to define ioctl numbers

Thu, 31 Jul 2025 06:23:10 -0700 

Hi All,

Xorg doesn’t start anymore after the commit tty: vt: use _IO() to define ioctl 
numbers.

Error message:

xf86OpenConsole: Switching VT failed.

I tested it with QEMU with virtio-gpu-pci and VGA,vgamem_mb=256 with some Linux 
distributions today.

I bisected today.

tty: vt: use _IO() to define ioctl numbers is the first bad commit 
(f1180ca37abe3d117e4a19be12142fe722612a7c)

I was able to revert the first bad commit.

After a new compiling, Xorg works again.

Please check the first bad commit.

Further information: https://github.com/chzigotzky/kernels/issues/14

Thanks,
Christian

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