kbd: Ignore fake shift keys

AT keyboards can produce "fake" shift keys on some extended events.
It's not necessary to process these artificial events as the actual
extended keys are detected directly.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/kbd.c b/src/kbd.c
index b00853f..b93d9d2 100644
--- a/src/kbd.c
+++ b/src/kbd.c
@@ -428,10 +428,16 @@ __process_key(u8 scancode)
         return;
     case 0x2a: /* L Shift press */
     case 0xaa: /* L Shift release */
+        if (flags1 & KF1_LAST_E0)
+            // Ignore fake shifts
+            return;
         kbd_set_flag(key_release, KF0_LSHIFT, 0, 0);
         return;
     case 0x36: /* R Shift press */
     case 0xb6: /* R Shift release */
+        if (flags1 & KF1_LAST_E0)
+            // Ignore fake shifts
+            return;
         kbd_set_flag(key_release, KF0_RSHIFT, 0, 0);
         return;
     case 0x1d: /* Ctrl press */