From: Fredrik Roubert Magic sysrq fails to work on many keyboards, particulary most of notebook keyboards. This should help... The idea is quite simple: Discard the SysRq break code if Alt is still being held down. This way the broken keyboard can send the break code (or the user with a normal keyboard can release the SysRq key) and the kernel waits until the next key is pressed or the Alt key is released. Signed-off-by: Pavel Machek Signed-off-by: Andrew Morton --- drivers/char/keyboard.c | 10 ++++++++-- 1 files changed, 8 insertions(+), 2 deletions(-) diff -puN drivers/char/keyboard.c~fix-magic-sysrq-on-strange-keyboards drivers/char/keyboard.c --- devel/drivers/char/keyboard.c~fix-magic-sysrq-on-strange-keyboards 2006-05-18 14:20:33.000000000 -0700 +++ devel-akpm/drivers/char/keyboard.c 2006-05-18 14:20:33.000000000 -0700 @@ -150,6 +150,7 @@ unsigned char kbd_sysrq_xlate[KEY_MAX + "230\177\000\000\213\214\000\000\000\000\000\000\000\000\000\000" /* 0x50 - 0x5f */ "\r\000/"; /* 0x60 - 0x6f */ static int sysrq_down; +static int sysrq_alt_use; #endif static int sysrq_alt; @@ -1144,7 +1145,7 @@ static void kbd_keycode(unsigned int key kbd = kbd_table + fg_console; if (keycode == KEY_LEFTALT || keycode == KEY_RIGHTALT) - sysrq_alt = down; + sysrq_alt = down ? keycode : 0; #ifdef CONFIG_SPARC if (keycode == KEY_STOP) sparc_l1_a_state = down; @@ -1164,9 +1165,14 @@ static void kbd_keycode(unsigned int key #ifdef CONFIG_MAGIC_SYSRQ /* Handle the SysRq Hack */ if (keycode == KEY_SYSRQ && (sysrq_down || (down == 1 && sysrq_alt))) { - sysrq_down = down; + if (!sysrq_down) { + sysrq_down = down; + sysrq_alt_use = sysrq_alt; + } return; } + if (sysrq_down && !down && keycode == sysrq_alt_use) + sysrq_down = 0; if (sysrq_down && down && !rep) { handle_sysrq(kbd_sysrq_xlate[keycode], regs, tty); return; _