Bug#583864: #583864 - gnome-settings-daemon: XF86TouchpadToggle gets out of sync on hibernation

[Kalle Olavi Niemitalo]

althaser <althaser at gmail.com> writes:

> Could you please still reproduce this issue with newer
> gnome-settings-daemon version like 3.4.2+git20121218.7c1322-3+deb7u3 or
> 3.8.5-2 ?

I upgraded the laptop to Wheezy and the bug no longer occurs.

Test A:
1. Disable the touchpad by pressing the touchpad toggle button.
   The button lights up.
2. echo disk > /sys/power/state
3. Wait until Linux saves the pages to disk and turns the screen off.
4. Wait until the fan turns off and the touchpad toggle button
   is no longer lit.
5. Press the power button.  The touchpad toggle button lights up;
   the BIOS apparently remembers the touch pad was disabled.
6. Enter the Linux disk encryption passphrase.
7. Wait until GNOME comes back up.  The touchpad toggle button stays lit.
8. Try to use the touchpad.  It correctly remains disabled.
9. Press the touchpad toggle button.  The light goes out, and
   the onscreen indicator shows the touchpad is enabled.
10. Try to use the touchpad.  It works correctly.

Test B:
1-5. As in test A.
6. At the passphrase prompt, hold the power button for a
   few seconds so the laptop turns off.
7. Press the power button again.  The touchpad toggle button
   does not light up.
8. Enter the Linux disk encryption passphrase.
9. Wait until GNOME comes back up.  The touchpad toggle button stays dim.
10. Try to use the touchpad.  It works correctly.
11. Press the touchpad toggle button.  It lights up, and the
    onscreen indicator shows the touchpad is disabled.
12. Try to use the touchpad.  It correctly remains disabled.

I can no longer reach the failure mode where the touchpad remains
disabled no matter how many times I press the button.

How it was fixed: The touchpad toggle button used to generate the
XF86TouchpadToggle keysym, but in Wheezy, it instead generates
XF86TouchpadOff or XF86TouchpadOn.  When gnome-settings-daemon
3.4.2+git20121218.7c1322-3+deb7u3 receives XF86TouchpadOff or
XF86TouchpadOn, it shows the new state on the screen but does not
save the state anywhere.¹²

Support for XF86TouchpadOff or XF86TouchpadOn was first included
in GNOME_SETTINGS_DAEMON_2_91_4.³  The experimental Debian package
of gnome-settings-daemon 2.91.5.1-1 includes that change.
However, I'm not sure it'd be right to mark the bug as having
been fixed in that version, because the fix required changes in
Linux and in the X server too.  All of them are in Wheezy though.

¹ https://git.gnome.org/browse/gnome-settings-daemon/tree/plugins/media-keys/gsd-media-keys-manager.c?h=gnome-3-4&id=7c13221aa9081fff70ab258a5e86a78506cf7359#n1820
² https://git.gnome.org/browse/gnome-settings-daemon/tree/plugins/media-keys/shortcuts-list.h?h=gnome-3-4&id=7c13221aa9081fff70ab258a5e86a78506cf7359#n91
³ https://git.gnome.org/browse/gnome-settings-daemon/commit/?h=gnome-3-0&id=1c8f64d1dc6beb7d27a6dce74fa29e27e8c34583
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