Red Hat Bugzilla – Bug 109598
Logout causes screen "image" to "follow" pointer movement
Last modified: 2007-11-30 17:10:33 EST
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4.1) Gecko/20031030 Description of problem: When logging out of the desktop, the screen turns black and flickers, as usually happens when X restarts, but once the log-in GUI is displayed, the screen image is off center and wraps around. The screen image follows the movement of the mouse pointer, but the actual screen doesn't. In other words, the location of the text box is still in the center of the screen, but the graphical image of the entire screen shifts along with mouse movement. I can still interact with the GUI widgets, but it is extremely difficult, as the visual display of the entire screen shifts and wraps around. The only way to fix the problem is to reboot! Note that the screen image doesn't move like when you have virtual desktop enabled, with a larger resolution than your actual display is set to. The screen image moves with a one to one correspondence with the mouse movement, and the image wraps around on all sides of the screen. Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: 1. Log into the desktop 2. Log out Actual Results: The screen image moves with mouse movement. Additional info: I am running an "all defaults" Fedora Core 1 desktop install on my IBM T30 laptop. It has an ATI Radeon 7500 Mobility. I did not have this problem with Redhat 9. I also appear to have no other X related issues. As long as I do not log-out, everything is perfect!
Ok, i have seen this issue specifically, which is really annoying. Another thing that I saw is that i usually run 2 X servers in parallel (2 different VTs). One is local login, another one is remote session. I am using ATI Radeon Mobility 6. So after a logout on the remote screen if I VT switch to the local (which is fine btw) when I switch back to the remote VT the screen goes blank and stays this way until I switch to another VT. I pulled the latest SRPM from rawhide which still has this issue. [ I run Fedora Core 1. ] I went and pulled out a few radeon patches and the problems went away. One patch that's really big (>100k) is (see the SPEC file from XFree86 srpm): Patch1202: XFree86-4.3.0-radeon-support-from-ATI-backport-from-CVS-v2.patch I also had to pull out the following patches (which by first glance are not related to the issue, but depend on the above patch in order to patch and compile properly) Patch1211: XFree86-4.3.0-redhat-radeon-forcelegacycrt-for-alan.patch Patch1215: XFree86-4.3.0-radeon-support-backport-from-CVS-v2.patch Patch1216: XFree86-4.3.0-radeon-autodetect-pci-or-agp-cards.patch Patch1217: XFree86-4.3.0-radeon-agp-detection-using-capability-list-walk.patch These changes solve this issue and a bunch of others. This could also resolve 109413 and possibly few others. In my opinion Patch1202 needs to be taken apart into smaller patches so that the other patches could be pulled in again. This would also let us close in on the problematic changes of code. If I manage to find more info on this, i'll report it here, time permitting.
I suspect my report of 110639 is related to the problem reported here and likely 109413 too. Have not tried bebuilding w/o Patch1202. Please announce if you post a link to the modified binary XFree86 package.
It's helpful when refering to other bug reports in bugzilla, to state them with the word "bug #" in front of them as bugzilla then automatically puts a hyperlink to them so you don't have to cut and paste, or type in the bug numbers to view them. I'll look at bug #110639 and bug #109413 now. ;o)
I should add that I notice this bug only when I am using an external monitor. When I use my Thinkpad's built-in LCD screen, I don't have this problem. There are a few other things that do not work correctly when using an external display as opposed to the built-in laptop LCD. One is the "xv" driver in Mplayer doesn't work... that is, I get no video, just a black or dark green splotch, and it does work with just the laptop LCD. This is a bad thing because I have to revert to the X11 driver and software scaling, which is heavy on the CPU utilization. So I guess what I am trying to say is that Fedora doesn't seem to work correctly when you use an external CRT with your IBM Thinkpad T30.
Since this bugzilla report was filed, there have been several major updates to the X Window System, which may resolve this issue. Users who have experienced this problem are encouraged to upgrade to the latest version of Fedora Core, which can be obtained from: If this issue turns out to still be reproduceable in the latest version of Fedora Core, please file a bug report in the X.Org bugzilla located at http://bugs.freedesktop.org in the "xorg" component. Once you've filed your bug report to X.Org, if you paste the new bug URL here, Red Hat will continue to track the issue in the centralized X.Org bug tracker, and will review any bug fixes that become available for consideration in future updates.