Package: installation-reports Severity: normal Dear Maintainer,
* What led up to the situation? * What exactly did you do (or not do) that was effective (or ineffective)? When I install Debian from debian-live-9.6.0-amd64-cinnamon.iso (language is en-US), ibus or something other compornent synthesizes key events as usual and put them into the event queue after handling original key events asynchronously. When I install Debian from debian-9.6.0-amd64-netinst.iso, ibus works as expected, i.e., it synthesizes key events with IBUS_IGNORED_MASK and does not put them into the event queue. * What was the outcome of this action? Firefox behaves odd. See bug report for Firefox: - https://bugzilla.mozilla.org/show_bug.cgi?id=1498823 - https://bugzilla.mozilla.org/show_bug.cgi?id=1516323 * What outcome did you expect instead? Same as installed from debian-9.6.0-amd64-netinst.iso, ibus should synthesize key events by itself with IBUS_IGNORED_MASK and don't put them into the event queue. Background of ibus: ibus allows conversion engine to work in different process. Therefore, when it receives a key event from application, it filters (consumes) the event temporarily. Then, when it does not handle the event, it synthesizes copy of the event and send them to the application. Then, application can handle the event. At this time, ibus sets modifier state to IBUS_IGNORED_MASK (1 << 25). Background of Firefox: Firefox filters all KeyPress and KeyRelease events to detect whether coming KeyPress event is generated by auto-repeat or not. For filtering it, Firefox uses gdk_window_add_filter(). If ibus works as expected, the filter is never called with synthesized key events. However, if I install Debian from debian- live-9.6.0-amd64-cinnamon.iso. Therefore, synthesized events are always decided as "repeated" key events by Firefox. It seems that the unexpected synthesized key events come not from ibus, but I couldn't find the synthesizer because getting stack from Firefox tells us that unexpected synthesized key events come from the event queue. I guess that ibus isn't setup correctly when I install Debian from debian- live-9.6.0-amd64-cinnamon.iso. -- System Information: Debian Release: 9.6 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable-debug'), (500, 'stable') Architecture: amd64 (x86_64) Kernel: Linux 4.9.0-8-amd64 (SMP w/6 CPU cores) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system)