[BioC] qrqc with error message of "unable to start device PNG" and "unable to open connection to X11 display"?

James W. MacDonald jmacdon at uw.edu
Wed May 30 15:22:05 CEST 2012

Hi SangChul,

On 5/29/2012 4:46 PM, Sang Chul Choi wrote:
> Hi,
> I am trying to use qrqc Bioc package in a linux machine used as a compute node.  I have the following error:
> ====================
> Error in X11(paste("png::", filename, sep = ""), g$width, g$height, pointsize,  :
>    unable to start device PNG
> In addition: Warning message:
> In grDevices::png(..., width = width, height = height, res = dpi,  :
>    unable to open connection to X11 display ''
> ====================
> I have googled for an answer and bumped into following mailing list posts:
> https://stat.ethz.ch/pipermail/r-help/2008-March/155943.html
> https://stat.ethz.ch/pipermail/r-help/2008-February/155021.html
> https://stat.ethz.ch/pipermail/r-help/2008-February/155023.html
> It is not obvious what I should do. I will appreciate your answers.

The simple answer is to run the code on the head rather than a compute 
node. In my experience, compute nodes usually don't have 'GUI-type' 
software installed (X11, png, etc), as it is not common for people to 
need that sort of thing.



> Thank you,
> SangChul
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James W. MacDonald, M.S.
University of Washington
Environmental and Occupational Health Sciences
4225 Roosevelt Way NE, # 100
Seattle WA 98105-6099

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