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Old 04-11-2004, 11:51 AM   #1
Registered: Apr 2003
Location: Edinburgh, Scotland, UK
Distribution: SuSE 9.2, VectorLinux 3.2
Posts: 68

Rep: Reputation: 15
java app flickers

I'm having a problem with a typing tutor called TypingMaster (the full/registered version). When you install, you can choose between a java VM which you already have installed, and a dedicated VM which it will install for you. Originally, I took the second option, because I didn't have j2sdk installed. However, I experienced what seems to be a fairly huge bug which renders the test section of the tutor unusable (I've contacted their support re this -- awaiting reply), so I decided to download and install j2sdk1.4, and re-installed TypingMaster, this time pointing it to the new java installation. Everything works now, but there's an *extremely* distracting flicker on the countdown timer as you carry out each exercise, which didn't happen with the dedicated java VM. Is this just bad programming, or can I somehow tweak my j2sdk installation and/or any other settings to help prevent this problem?

I don't know what other information would be helpful. I'm using nvidia's own graphics driver to support a geforce 4 MX440. I don't experience any display-related problems.

One other completely unrelated question. If I try to do anything X-related as root, I get an error message. For instance, suppose I try to turn off my scroll-lock LED as root with:

$ xset -led 3

I get this error.

Xlib: connection to ":0.0" refused by server
Xlib: Invalid XDM-AUTHORIZATION-1 key (failed key comparison)
xset: unable to open display ":0.0"

What's going on there?


Old 04-11-2004, 04:19 PM   #2
Registered: Mar 2004
Location: US
Distribution: Redhat 9 - Linux 2.6.3
Posts: 836

Rep: Reputation: 31
This could probably happen from incomplete code, or just not finished code,
also, maybe the refresh of the app is meant to run alot higher or lower than the current H-V refresh you have set.

this could also happen if your horiz or vertical refresh is signifagantly different. With some apps.
Probably the code, check for errata or patches.


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