[K12OSN] Managing screen resolution

Mon Oct 26 13:24:25 UTC 2009

Thank you very much for this.  Will start testing this out a little later
today.

On Thu, Oct 22, 2009 at 6:15 PM, Gideon Romm
<ltsp at symbio-technologies.com>wrote:

> Hi, everybody.  I figured I would chime in on forcing video modes.  In
> part, it depends upon what version of LTSP5 you are using, but I will
> talk about things in the most recent sense.
>
> Oh, also, anyone using "i810" for an intel card on a modern Linux
> distro, probably shouldn't.  "i810" was abandoned in favor of the
> "intel" driver.  But, that's just a side point.  Also, not that "vesa"
> only has "vesa" modes, so no widescreen options, no matter how much you
> try to force it.  So if its a widescreen resolution you're after, best
> not to use "vesa".
>
> Now, onto forcing video modes...
>
> In the latest version of LTSP5, by default, we look towards the video
> drivers' "Xrandr" capabilities to adjust the screen resolution.  For
> those of you unfamiliar with Xrandr, it is a mechanism supported by most
> drivers to adjust video settings on the fly, without restarting the
> Xserver or hardcoding settings in the Xserver configuration file.  To
> wit, there are a set of lts.conf variables prefixed with XRANDR_, such
> as:
>
> XRANDR_MODE_0 = "1024x768"
>
> (check the docs for a complete list of XRANDR_ variables for lts.conf)
>
> So, this is the preferred way of setting the mode.  If Xrandr cannot set
> the specified mode, it will fall back on the driver default, which is
> considerably more graceful than not starting the Xserver at all.
>
> If you find that you don't get the mode you want with the above setting,
> it may be because the mode cannot be achieved by the driver with the
> auto-detected sync frequencies for the attached monitor.  So, you may
> want to force:
>
> X_VERTREFRESH = "55-75"
> X_HORZSYNC = "30-100"
>
> (substituting the above ranges for those for the attached monitor).
>
> If you still cannot get the mode, you can fall back on not using Xrandr
> at all, and go back to the old way with:
>
> XRANDR_DISABLE = True
> X_MODE_0 = 1024x768
>
> If this still does not result in the desired mode, best to get a shell
> on the thin client itself, and look at the thin client's log file
> in /var/log/Xorg.*.log to see why the driver failed to give you the mode
> you requested.
>
> Hope this helps,
>
> -Gadi
>
> PS: Of course, all of the above can be done on a per-workstation basis
> by putting the parameters in the appropriate MAC-address-delineated
> section of your lts.conf file
>
> On Wed, 2009-10-21 at 23:14 +0530, raju VK wrote:
> > But the basic question is still unanswered.
> >
> > How to set individual clients video / graphic settings?.
> > I myself is struggling to set the video for some 845G chipset clients.
> > The auto detected screen /window is corrupted and is not responding.
> > When I used XSERVER = i810, in the lts.conf, for the client, there is
> > no window at all. on XSERVER=vesa, I getting a working screen / window
> > but the resolution is only 600x480, which is not useful.
> > the client was perfectly working when RH9 was installed on HDD, and
> > the video driver was i810.
> > As the server is using ATI card, do I require to copy / install  any
> > i810 files to get it properly worked on the client.
> >
> >
> >
> >
> > On Tue, Oct 20, 2009 at 9:59 AM, Almquist Burke
> > <burke at thealmquists.net> wrote:
> >         -----BEGIN PGP SIGNED MESSAGE-----
> >         Hash: SHA1
> >
> >
> >
> >         On Oct 19, 2009, at 11:00 PM, Steven James Drinnan wrote:
> >
> >                 Just a thought, do the users like these resolutions or
> >                 just bigger text.
> >                 Maybe it would be better if you asked if they would
> >                 prefer larger fonts.
> >                 That way the screen resolution would be preserved but
> >                 they would be able
> >                 to see everything more clearly.
> >
> >
> >
> >         Wow, I just wanted to say that this is a huge pet peeve of
> >         mine. Most users don't know and better (and frankly, in
> >         windows, there isn't any good way to increase icon and font
> >         sizes globally) so they just lower the screen resolution and
> >         make everything bigger at the cost of making everything fuzzy.
> >         -----BEGIN PGP SIGNATURE-----
> >         Version: GnuPG v1.4.7 (Darwin)
> >
> >         iEYEARECAAYFAkrdPMAACgkQxWV7OPa/g5E3BwCfdDTli0h/KRngIgLMs7yBuMsD
> >         VBsAn10bbKxicfvful2qQv1ysacY6ZhL
> >         =TMN8
> >         -----END PGP SIGNATURE-----
> >
> >
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> >
> >
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> --
> --------------------------------------------------------
> Gideon Romm | Proud LTSP Developer
> ltsp at symbio-technologies.com
>
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