Stephen, et al,

I'm not certain whether the cause of similar behavior is the same but the 
symptoms are very similar--especially the " when I move a window on the 
screen, the content isn't erased from the old location, leaving a trail of 
ghosts behind".  In my case the ghosts do get erased after several 
seconds.

My setup is also quite different.  I'm using X2go from a Dell Optiplex 
9010 running Windows 7 to reach SL7 running on an HP DL360 in the 
basement.  Initially, response was snappy and I had no problems loading up 
gobs of Firefox windows.  Then, about two weeks ago--seems like 
years--response became less than acceptable.  In my case response seems to 
get worse as the time since reboot on the Dell increases and a reboot 
provides temporary improvement.

Unfortunately, I've been sufficiently busy I haven't had time to chase 
down the cause of the changed behavior.

Clint

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On Thu, 31 Mar 2016, Stephen Isard wrote:

> I have a Dell Optiplex 980 with a Radeon HD 6450 card which was working fine 
> with the elrepo fglrx-x11-drv and kmod-fglrx packages until I recently 
> upgraded to kernel 2.6.32-573.12.1.el6.x86_64 and fglrx versions 15.12-1. 
> Now when I move a window on the screen, the content isn't erased from the old 
> location, leaving a trail of ghosts behind.
> This happens with more than one window manager (fvwm, icewm, fluxbox), so I 
> think its an X problem, rather than a window manager bug.
>
> The guys at elrepo were very responsive, but they didn't have the problem on 
> their own machines, and it's not really their software - it is closed source 
> from ATI - and they have run out of guesses for what to try.  I have tried 
> installing ATI's own rpm and that behaves the same way.  I've filed a bug on 
> the unofficial ATI bugzilla, but don't have great hopes there.  I'm wondering 
> whether anyone here has ever seen symptoms like these.  Using the radeon 
> driver gets me a mostly usable system, but there is some stuff that says it 
> won't work without glx.
>
> Stephen Isard
>
>