1 files changed, 5 insertions, 0 deletions

diff --git a/arch/x86/boot/main.c b/arch/x86/boot/main.c
index 2296164b54d..197421db1af 100644
--- a/arch/x86/boot/main.c
+++ b/arch/x86/boot/main.c
@@ -73,6 +73,11 @@ static void keyboard_set_repeat(void)
  */
 static void query_ist(void)
 {
+        /* Some older BIOSes apparently crash on this call, so filter
+           it from machines too old to have SpeedStep at all. */
+        if (cpu.level < 6)
+                return;
+
         asm("int $0x15"
             : "=a" (boot_params.ist_info.signature),
               "=b" (boot_params.ist_info.command),