[FWTools] OpenEV and system freeze

[Frank Warmerdam]

Hernán De Angelis wrote:
> Hi all,
> 
> I am frequent (and happy) user of OpenEV, and have used it for about
> two and a half years now. I normally use it to visualize rasters or to
> digitize on them using shapefiles. From time to time, however, I
> experience a very annoying situation, particularly when opening big
> rasters or manipulating large and complicated vector layers: the whole
> system freezes and there is no way out of that rather than swtiching
> off the computer by brute-force. I have tried all possible
> combinations (Alt+F4, Alt+sysrq+B, etc) but nothing, switching off is
> the only working solution. Of course, after that extreme measure the
> last unsaved changes are lost, so I painfully learned to save the
> vector file after every single digitized polygon or so. I have
> experienced this problem with several versions of the operating system
> I use (SuSE 9.1, 9.3 and all versions of openSUSE until 10.3), using
> several versions of FWTools. Is this a known issue? Is there any
> solution or is a part of the "OpenGL / Mesa" issues?

Hernán,

This sounds like an OpenGL driver problem.  If you are using the software
OpenGL distributed with FWTools then adding the -h flag to openev might
avoid the problem.  The -h flag uses the systems own OpenGL implementation
and is potentially must faster if it takes advantage of hardware acceleration.

If you are already using -h, then not using -h or possibly upgrading your
video drivers (or even card) may help.

Best regards,
-- 
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
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