Bug 1464844

Summary:	tigervnc does not support more than 7 mouse buttons
Product:	Red Hat Enterprise Linux 7	Reporter:	Rod Nayfield <rcn>
Component:	tigervnc	Assignee:	Jan Grulich <jgrulich>
Status:	CLOSED WONTFIX	QA Contact:	Desktop QE <desktop-qa-list>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	7.5	CC:	jgiordan, jkoten, jscalf
Target Milestone:	rc
Target Release:	7.5
Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	If docs needed, set a value
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Last Closed:	2017-08-16 14:50:53 UTC	Type:	Bug
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Embargoed:
Bug Depends On:
Bug Blocks:	1479818

Description Rod Nayfield 2017-06-26 04:28:20 UTC

Description of problem:

TigerVNC does not support a typical 9 button mouse.


Version-Release number of selected component (if applicable):

all including upstream source


How reproducible:

Always


Steps to Reproduce:
1.  Own 9-button mouse (L/R/middle, wheel up/down, wheel L/R, back, forward)
2.  view xinput/xev information via vnc and use mouse

Actual results:
first 7 events (through wheel L/R) are sent).  Back/Forward (side buttons) are not sent.


Expected results:
back/Forward buttons work.

Additional info:

https://github.com/TigerVNC/tigervnc/blob/0536d0975bb9e8e4a8aae693bd79157955a896b1/unix/xserver/hw/vnc/Input.c#L47

#define BUTTONS 7

Comment 2 Rod Nayfield 2017-06-26 04:30:15 UTC

This limit requires non-free software for VDI applications.

Comment 4 Joe Giordano 2017-08-10 19:38:15 UTC

Also tested with spice and didn't have the capability of all 7 buttons.

Comment 8 Jan Grulich 2017-08-14 09:09:03 UTC

Testing builds:
https://jgrulich.fedorapeople.org/tigervnc/

Comment 9 Jan Grulich 2017-08-16 14:50:53 UTC

Hmm, it seems that in the end we cannot fix it this way and actually we cannot fix ithis at all. According to specification the RFB protocol can support only up to 7 mouse buttons. I should have read the specs first.

See https://github.com/TigerVNC/tigervnc/pull/497.

Comment 10 Jan Grulich 2017-08-24 10:28:15 UTC

There is possibility of defining a vnc extension, but it doesn't seem to be an easy task and I'm already overhelmed with other packages/bugs. On the other hand you can use the scratch build above where this will work, but it will break compatibility with other VNC server/clients so you can use it only with the exactly same build of tigervnc (both server and the client).