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Description of problem:

On a workstation with Redhat 8.x (tested on 8.2), if user set the XServer to 10bit per channel, the graphic looks ok, keyboard is working, but the mouse click doesn't work anymore.  This makes the workstation unusable when using 10bit monitor.

This is a regression from RH7.x with kde, where 10bit support was working fine.  
This is also a major regression for graphic applications (like in the M&E industry), where color accuracy on the graphic monitor is super important.


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

mutter v3.32.2-34 (RH8.2 default)
mutter v3.32.2-48 


How reproducible:

- Need a wks with a graphic card supporting 10bit per channel.
- need to use XServer (not tested on Wayland)
- be sure to enable 10bit per channel for the XServer (Depth of 10 in the /etc/X11/xorg.conf)
- start the XServer, login, and try to click with the mouse.


Actual results:

Graphic monitor looks ok; keyboard ok, mouse movement ok, mouse click FAILS 


there is multiple discussions on the web for this topic, one of them: 
https://bugzilla.gnome.org/show_bug.cgi?id=743620

I backported geometric picking that was introduced in GNOME 3.34, which effectively fixes this issue. Scratch build available here: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=35153740

i was able to reproduce the issue using radeon 5700.
With new mutter from comment 1  there was no issue.

tested with mutter-3.32.2-56.el8, mouse works properly.

Based on comment #8 moving on 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 (Moderate: GNOME security, 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/RHSA-2021:1586