RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.

Description of problem:
When using x0vncserver with the motif window manager, mouse cursor is observed to exhibit ghosting behavior.

When MIT-SHM is enabled, this is continuous ghosting. When it is disabled, the ghosting occurs only when the mouse is clicked (either buttons).

Version-Release number of selected component (if applicable):
motif-2.3.4-16.el8.x86_64
tigervnc-server-1.11.0-6.el8.x86_64
tigervnc-server-minimal-1.11.0-6.el8.x86_64
xorg-x11-server-Xorg-1.20.10-1.el8.x86_64

How reproducible:
Customer is able to consistently reproduce the behavior.

Steps to Reproduce:
1. Configure system to use motif on display :0.
2. Start x0vncserver (in one test using -UseSHM 0)
3. Observe behavior of mouse cursor on screen.

Actual results:
When using MIT-SHM:
	Consistent mouse cursor ghosting.
When MIT-SHM is disabled:
	Ghosting occurs when clicking is performed.

Expected results:
Proper mouse functionality with no ghosting behavior observed.

Can you try whether this is fixed with Tigervnc 1.12.0 we have now in RHEL 8.6? I can see some upstream fixes that could be related to this issue.

Like: https://github.com/TigerVNC/tigervnc/commit/fb561eb321b36dcf13932c903047ce08e55d67d5

Also, the bug description says it's one monitor setup, but with one monitor setup such behavior wouldn't happen and reading the customer issue this is a X11 with zaphod mode, using two screens 0.0 and 0.1.

Hello,

From the customer's testing, with version 1.12.0, they were still observing the behavior. The customer also tested with the MIT-SHM extension disabled as well.

Brandon Clark, RHCE
Red Hat Global Support Services

Hi, thank you for confirmation. I will try to create a setup where I can reproduce this issue and attempt to fix it.

Hi, can you test (ask customer to test) following scratch build? It should fix this issue. 

Build: https://jgrulich.fedorapeople.org/tigervnc-x0vncserver-zaphod/Whe
Upstream PR: https://github.com/TigerVNC/tigervnc/pull/1513

Clearing my needinfo (ITM provided).

As per https://bugzilla.redhat.com/show_bug.cgi?id=2109679#c7 moving to verified.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (tigervnc bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:7575