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| author | Marcos Paulo de Souza <marcos.souza.org@gmail.com> | 2016-10-01 12:07:35 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-10-28 03:45:24 -0400 |
| commit | 5d6b57eb1021da62db394896eeba23829f672665 (patch) | |
| tree | 9dc0c0d2101cca499bf8d6657e7bbf313f7f5357 /Documentation | |
| parent | 270e1295688c1830a8fc498e84c17f7e512fcfb2 (diff) | |
| download | linux-stable-5d6b57eb1021da62db394896eeba23829f672665.tar.gz linux-stable-5d6b57eb1021da62db394896eeba23829f672665.tar.bz2 linux-stable-5d6b57eb1021da62db394896eeba23829f672665.zip | |
Input: i8042 - skip selftest on ASUS laptops
commit 930e19248e9b61da36c967687ca79c4d5f977919 upstream.
On suspend/resume cycle, selftest is executed to reset i8042 controller.
But when this is done in Asus devices, subsequent calls to detect/init
functions to elantech driver fails. Skipping selftest fixes this problem.
An easier step to reproduce this problem is adding i8042.reset=1 as a
kernel parameter. On Asus laptops, it'll make the system to start with the
touchpad already stuck, since psmouse_probe forcibly calls the selftest
function.
This patch was inspired by John Hiesey's change[1], but, since this problem
affects a lot of models of Asus, let's avoid running selftests on them.
All models affected by this problem:
A455LD
K401LB
K501LB
K501LX
R409L
V502LX
X302LA
X450LCP
X450LD
X455LAB
X455LDB
X455LF
Z450LA
[1]: https://marc.info/?l=linux-input&m=144312209020616&w=2
Fixes: "ETPS/2 Elantech Touchpad dies after resume from suspend"
(https://bugzilla.kernel.org/show_bug.cgi?id=107971)
Signed-off-by: Marcos Paulo de Souza <marcos.souza.org@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index a4f4d693e2c1..46726d4899fe 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1457,7 +1457,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted. i8042.nopnp [HW] Don't use ACPIPnP / PnPBIOS to discover KBD/AUX controllers i8042.notimeout [HW] Ignore timeout condition signalled by controller - i8042.reset [HW] Reset the controller during init and cleanup + i8042.reset [HW] Reset the controller during init, cleanup and + suspend-to-ram transitions, only during s2r + transitions, or never reset + Format: { 1 | Y | y | 0 | N | n } + 1, Y, y: always reset controller + 0, N, n: don't ever reset controller + Default: only on s2r transitions on x86; most other + architectures force reset to be always executed i8042.unlock [HW] Unlock (ignore) the keylock i8042.kbdreset [HW] Reset device connected to KBD port |