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NAG's IRIS Explorer™ - Frequently Asked Technical Questions - DEC Alpha (UNIX)

This document is designed for users of IRIS Explorer with DEC Alpha (UNIX)-specific questions. For more general questions, or those that apply to another platform, please select one of the links provided in the right side box.

Questions

Answers

The colours in my windows change as I move from window to window. [Top]

Some graphics adaptors (e.g. the ZLX(p)-E1) support only 8 bits per pixel, i.e. only 256 colors on screen at a time. This sometimes forces the window manager to switch colormaps as the user moves from window to window. To ensure this happens correctly when using IRIS Explorer the environment variable "CXCOLORMAP" should be set before running IRIS Explorer:

C shell users:

% setenv CXCOLORMAP

Bash/Korn shell users:

% CXCOLORMAP=
% export CXCOLORMAP

The Render module fails whilst attempting to take either a Snapshot or Print with the error messages: [Top]

Render: X Error of failed request: BadWindow (invalid Window parameter)
Render: Major opcode of failed request: 3 (X_GetWindowAttributes)
Render: Resource id in failed request: 0x4800003
Render: Serial number of failed request: 28
Render: Current serial number in output stream: 29

The DISPLAY environment variable is either not set, or is set to":0.0" causing the system to use "direct rendering" on certain graphics cards (e.g. 4D60T, 4D51T, 4D50T, 4D40T). To avoid this, modify the DISPLAY variable to contain your hostname, e.g. on a system called "dennis":

C shell users:

% setenv DISPLAY dennis:0.0

Bash/Korn shell users:

% DISPLAY=dennis:0.0
% export DISPLAY

N.B. This may cause a slight drop in performance.