Public bug reported:
Environment:
• OS: Ubuntu 24.04.4 LTS (Noble)
• GNOME Remote Desktop: 46.3 (PipeWire/RDP)
• Session type: X11 (WaylandEnable=false in /etc/gdm3/custom.conf)
• Input Method: IBus + Mozc (mozc-server 2.28.4715.102+dfsg-2.2build7)
• Input mode: Kana input (かな入力)
• Client: Windows 11 Pro built-in Remote Desktop Connection (mstsc.exe)
• Keyboard: Japanese keyboard (jp106)
Problem Description:
When connecting to Ubuntu via RDP using the Windows 11 built-in Remote Desktop
Connection client, the Japanese prolonged sound mark (長音符, ー, U+30FC) cannot be
input correctly in Kana input mode.
The physical key for the prolonged sound mark is located on the Japanese
keyboard and works correctly when using the keyboard directly connected to the
Ubuntu machine. However, via RDP, the key is received as keycode 8 with keysym
NoSymbol, as confirmed by xev.
Steps to Reproduce:
1. Set up Ubuntu 24.04 with GNOME Remote Desktop enabled
2. Configure IBus with Mozc in Kana input mode
3. Connect from Windows 11 Pro using the built-in Remote Desktop
Connection
4. Switch to Kana input mode and attempt to type the prolonged sound
mark (ー)
Expected Behavior:
The prolonged sound mark (ー) should be input correctly via RDP, consistent with
local keyboard input.
Actual Behavior:
The prolonged sound mark key is received as keycode 8 (NoSymbol) via RDP. When
xmodmap is used to assign prolongedsound to keycode 8 as a workaround, the
character is output at the X11 level, bypassing Mozc's Kana processing. This
causes incorrect input order — for example, typing "キーボード" (keyboard) results
in "ーーきぼど" instead.
Investigation Summary:
• Confirmed via xev that the prolonged sound mark key arrives as
keycode 8 (keysym 0x0, NoSymbol) during RDP sessions
• The same key works correctly in local sessions
• The issue persists regardless of whether the session type is Wayland
or X11
• Workaround using xmodmap -e "keycode 8 = prolongedsound" allows the
character to appear, but disrupts Mozc's Kana input processing, resulting in
incorrect character order
• No keyboard-related settings are available in grdctl for this version
Workaround:
Currently using Copy & Paste to input the prolonged sound mark when needed via
RDP.
Additional Information:
This issue specifically affects Japanese keyboard users using Kana input mode
(かな入力) via RDP. It does not affect Romaji input mode (ローマ字入力) users, which may
explain why it has not been widely reported.
** Affects: gnome-remote-desktop (Ubuntu)
Importance: Undecided
Status: New
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2151294
Title:
Japanese prolonged sound mark (ー) cannot be input via RDP remote
connection
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-remote-desktop/+bug/2151294/+subscriptions
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
