[K12OSN] graphics problems w/ multiple SCREENs

[Rob Owens]

I just bought a new LTSP Term 1000 PXE and I'm having the same problem. 
Has anybody else seen this happen?  I thought it might have been due to
my older hardware, but now I'm seeing the problem on a brand-new thin
client. 

The issue occurs when using either the sis or the vesa driver.

This is really screwing up my LTSP implementation here.  My users need
to toggle back and forth between the Linux and Windows terminal servers.

I ran ltspadmin to see if all my components are up to date, and
everything is except it says that ltsp_kernel is not installed.  This
can't be right, I don't think, since I am successfully running thin clients.

Any ideas would be appreciated.  I'm running K12LTSP 5.0EL, fully
updated from a beta version.

-Rob

Rob Owens wrote:
> Forcing the vesa driver seemed to be an improvement, but it did not
> completely fix the problem.  I say it was an improvement because it went
> from being a problem 100% of the time, to being a problem about 50% of
> the time.  Weird.
>
> -Rob 
>
> -----Original Message-----
> From: k12osn-bounces at redhat.com [mailto:k12osn-bounces at redhat.com] On
> Behalf Of Rob Owens
> Sent: Friday, June 01, 2007 11:26 AM
> To: Support list for open source software in schools.
> Subject: RE: [K12OSN] graphics problems w/ multiple SCREENs
>
> This sure is a lonely thread...
>
> I took one of the P3 machines that was giving me trouble with the LCD
> monitor, and tested it using a CRT.  Same problem.  So my
> not-so-educated guess is that there's a glitch in the auto-detection of
> the video cards in the problem machines.  I'll try forcing the vesa
> driver and see if that has any effect.
>
> -Rob
>
> -----Original Message-----
> From: k12osn-bounces at redhat.com [mailto:k12osn-bounces at redhat.com] On
> Behalf Of Rob Owens
> Sent: Friday, May 25, 2007 2:35 PM
> To: Support list for open source software in schools.
> Subject: RE: [K12OSN] graphics problems w/ multiple SCREENs
>
> Some more info:
>
> I tested on another client w/ a CRT monitor and the problem did not
> occur.  It still occurs on the machines specified in the emails below.
>
> Out of desperation I tried upgrading to rdesktop 1.5, and that did not
> fix the problem. 
>
> -Rob
>
> -----Original Message-----
> From: k12osn-bounces at redhat.com [mailto:k12osn-bounces at redhat.com] On
> Behalf Of Rob Owens
> Sent: Thursday, May 24, 2007 11:16 AM
> To: Support list for open source software in schools.
> Subject: RE: [K12OSN] graphics problems w/ multiple SCREENs
>
> I've now also confirmed this problem on another client which has a CRT
> monitor (same server as #1 and #2, below).  Again, this is on K12LTSP
> 5.0.0EL
>
> -Rob 
>
> -----Original Message-----
> From: k12osn-bounces at redhat.com [mailto:k12osn-bounces at redhat.com] On
> Behalf Of Rob Owens
> Sent: Thursday, May 24, 2007 7:54 AM
> To: Support list for open source software in schools.
> Subject: RE: [K12OSN] graphics problems w/ multiple SCREENs
>
> I've confirmed the following:
>
> 1) This problem exists on two different computers (both computers have
> the same make/model of lcd monitor, but different video cards)
>
> 2) This problem occurs *sometimes* on a laptop that's being used as a
> thin client.  When the problem occurs on this laptop, the graphics are
> only slightly messed up (a black bar across the bottom of the screen).
> Toggling back to SCREEN_01 then back to SCREEN_02 usually corrects it.
>
> 3) This problem does not occur on my home system, which is LTSP 4.2 on
> Xubuntu 6.10
>
> I'll test out more machines and post back.  Let me know if any of you
> have any ideas...
>
> -Rob
>
> -----Original Message-----
> From: k12osn-bounces at redhat.com [mailto:k12osn-bounces at redhat.com] On
> Behalf Of Rob Owens
> Sent: Wednesday, May 23, 2007 12:12 PM
> To: Support list for open source software in schools.
> Subject: [K12OSN] graphics problems w/ multiple SCREENs
>
> I'm running K12LTSP 5.0.0EL
>  
> SCREEN_01 = startx
> SCREEN_02 = rdesktop -f -a 16 10.xxx.xxx.xxx
> SCREEN_03 = shell
>  
> All screens work fine, but if I log in to the Windows terminal server on
> SCREEN_02, then go to SCREEN_01, then back to SCREEN_02, the graphics
> are unreadable on SCREEN_02.
>  
> I can "fix" it by toggling to SCREEN_03 and then back to SCREEN_02 --
> the graphics go back to normal.
>  
> Any idea what I can do to fix this?
>  
> -Rob
>
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