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author | Eric Miao <eric.miao@canonical.com> | 2013-06-04 18:30:55 +0200 |
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committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2013-06-04 18:33:16 +0200 |
commit | eeb065582a9618c1cf5b7154df7bae06aeb44636 (patch) | |
tree | 4c3fbbe0d1ac6d9e4ff57612855ec762ee31ca76 /CREDITS | |
parent | Input: wacom - add an eraser to DTH2242/DTK2241 (diff) | |
download | linux-eeb065582a9618c1cf5b7154df7bae06aeb44636.tar.xz linux-eeb065582a9618c1cf5b7154df7bae06aeb44636.zip |
Input: synaptics - fix sync lost after resume on some laptops
In summary, the symptom is intermittent key events lost after resume
on some machines with synaptics touchpad (seems this is synaptics _only_),
and key events loss is due to serio port reconnect after psmouse sync lost.
Removing psmouse and inserting it back during the suspend/resume process
is able to work around the issue, so the difference between psmouse_connect()
and psmouse_reconnect() is the key to the root cause of this problem.
After comparing the two different paths, synaptics driver has its own
implementation of synaptics_reconnect(), and the missing psmouse_probe()
seems significant, the patch below added psmouse_probe() to the reconnect
process, and has been verified many times that the issue could not be reliably
reproduced.
There are two PS/2 commands in psmouse_probe():
1. PSMOUSE_CMD_GETID
2. PSMOUSE_CMD_RESET_DIS
Only the PSMOUSE_CMD_GETID seems to be significant. The
PSMOUSE_CMD_RESET_DIS is irrelevant to this issue after trying
several times. So we have only implemented this patch to issue
the PSMOUSE_CMD_GETID so far.
Tested-by: Daniel Manrique <daniel.manrique@canonical.com>
Signed-off-by: James M Leddy <james.leddy@canonical.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'CREDITS')
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