Bug 243920
Summary: | Jerky pointer movement with Xen guest virtual pointer device | ||||||||||
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Product: | [Fedora] Fedora | Reporter: | Daniel Berrangé <berrange> | ||||||||
Component: | xorg-x11-drv-evdev | Assignee: | Kristian Høgsberg <krh> | ||||||||
Status: | CLOSED WONTFIX | QA Contact: | |||||||||
Severity: | medium | Docs Contact: | |||||||||
Priority: | medium | ||||||||||
Version: | 7 | CC: | mcepl, mcepl, triage, xen-maint, xgl-maint | ||||||||
Target Milestone: | --- | ||||||||||
Target Release: | --- | ||||||||||
Hardware: | All | ||||||||||
OS: | Linux | ||||||||||
Whiteboard: | |||||||||||
Fixed In Version: | Doc Type: | Bug Fix | |||||||||
Doc Text: | Story Points: | --- | |||||||||
Clone Of: | Environment: | ||||||||||
Last Closed: | 2008-06-17 01:34:00 UTC | Type: | --- | ||||||||
Regression: | --- | Mount Type: | --- | ||||||||
Documentation: | --- | CRM: | |||||||||
Verified Versions: | Category: | --- | |||||||||
oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||||||
Cloudforms Team: | --- | Target Upstream Version: | |||||||||
Embargoed: | |||||||||||
Bug Depends On: | |||||||||||
Bug Blocks: | 221360, 245193 | ||||||||||
Attachments: |
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Description
Daniel Berrangé
2007-06-12 18:59:28 UTC
Created attachment 156818 [details]
Sample Xorg config to use evdev with Xen guest framebuffer
Looking at the way the evdev events are fed from kernel upto X, the data stream has 3 core types of event - X axis update - Y axis update - Sync event The kernel normally sends a sequence of - X axis update + Y axis update + sync event - X axis update + sync event - Y axis update + sync event There is some extra code in the evdev driver, however, which does an explicit sync after every individual X or Y axis event. This seems to be causing the X axis update to be lost - resulting in the cursor travelling up the left-hand side of the screen when moved diagonally. This manual sync looks unneccessary since the kernel sends an explicit sync event whenever one ie needed. So I wrote the attached patch which removed the two redundant calls to sync pointer position. This resulted in smooth mouse movement expected. I'm a little puzzelled why these explicit sync calls are in the driver at all - not clear they could ever have worked correctly ?!?! Created attachment 156820 [details]
Remove redundant pointer sync calls
Created attachment 172417 [details]
Remove redundant pointer sync calls
The xorg-x11-drv-evdev code currently in F7/rawhide doesn't compile. This
updated patch includes a fix to also remove use of
SendCoreEvents/DontSendCoreEvents flags which allows the driver to be rebuilt
with the pointer sync fix.
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