Comment 5 for bug 567955

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The Loeki (the-loeki) wrote :

As a related comment, the serial port is *always* ttyS0, even when it's not there, and even when both GRUB2 itself and the kernel are all configured to go to, say ttyS1 or something completely else.

I propose to modify /etc/grub.d/20_memtest86+

* Look at /sys/class/tty/ ; if there's nothing in there that's not virtual (there should be a good way to weed out the virtual devices by looking at this), skip the serial port config
* AND/OR look at GRUB2/the kernel; if they're not configured for serial communication, why should you for memtest?