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I found the solution myself just after asking this question. To switch back the console in which X is running (usually tty7), from ASCII mode to RAW mode execute the following command: sudo kbd_mode -s -C /dev/tty7 And now everything works as expected again. :) More information available in the question: What does raw/unraw keyboard mode mean?

When you press a key on your keyboard, it sends a numeric code to the computer, called a scan code. The scan code tells the computer which key was pressed; for example, on a typical US keyboard, the A key sends the scan code 30 when you press it (and 158 when you release it). The keyboard driver reports these codes directly to applications when the keyboard ...

On a typical laptop, you need to press the Fn key to press SysRq. If you also press the letter in the same movement, you end up pressing Fn+Alt+SysRq+letter. But several letters are mapped to numeric keypad keys when combined with Fn. For example, if you try to press Alt+SysRq+U, you end up pressing Alt+SysRq+Num4 instead. To avoid this pitfall, press and ...

Apparently, it can be enabled/disabled using /proc/sys/kernel/sysrq if the kernel supports it, i.e., CONFIG_MAGIC_SYSRQ is enabled in the kernel config what should be the case for Slackware, according to this.

You can define which type of code your keyboard sends. This is done via the keyboard mode. You can change the mode of a keyboard with kbd_mode. These are the options from the manpage: -s: scancode mode (RAW), -k: keycode mode (MEDIUMRAW), -a: ASCII mode (XLATE), -u: UTF-8 mode (UNICODE). Its much easier for a developer to catch key events ...