From 940bf2a972a93c009b8ab18c92c472abe6f9f57c Mon Sep 17 00:00:00 2001 From: Bernardo Innocenti Date: Thu, 20 Dec 2007 17:51:59 +0100 Subject: [PATCH] Fix cursor occasionally jumping to the bottom right corner of the screen (OLPC#2804) Organization: One Laptop Per Child --- drivers/input/mouse/olpc.c | 13 +++++++++++-- 1 files changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/input/mouse/olpc.c b/drivers/input/mouse/olpc.c index 6bace2f..9479658 100644 --- a/drivers/input/mouse/olpc.c +++ b/drivers/input/mouse/olpc.c @@ -148,8 +148,17 @@ static void olpc_process_packet_gspt(struct psmouse *psmouse) input_report_abs(dev, ABS_X, x); input_report_abs(dev, ABS_Y, y); } else if (psmouse->packet[0] == OLPC_PKT_GS && gs_down) { - input_report_abs(dev2, ABS_X, x); - input_report_abs(dev2, ABS_Y, y); + /* + * The GS sometimes switches into a broken mode where it reports + * two consecutive finger up events, with coordinates set to 0,0. + * This creates a large delta and makes the cursor jump to the + * bottom-right corner. + * The simplest workaround is refusing to report movement to (0,0). + */ + if (x != 0 || y != 0) { + input_report_abs(dev2, ABS_X, x); + input_report_abs(dev2, ABS_Y, y); + } } input_sync(dev); -- 1.5.3.3