Re: knoppix screen-1280x800 does not work

[JD <jd1008@gmail.com>]

Alas, xrandr -q shows these resolutions:
1600x1200, 1280x1024, 1024x768, 800x600
but it does not show 1280x800, even though it is
the native resolution of he LVDS.
I tried to add that mode, but xrandr says it is not listed
among the list of available resolutions.
All lxrandr does is invoke the monitor config gui, which
pretty much shows the above set of resolutions.


On 02/21/2011 02:07 AM, Klaus Knopper wrote:
> On Sun, Feb 20, 2011 at 06:03:24PM -0800, JD wrote:
> > Hi all.
> > I am still unable to get 1280x800 screen when
> > I boot with the args
> > knoppix screen=1280x800
> >
> > and this, even after I have installed 6.4.4 to hard drive, and
> > booted from hard drive.
> >
> > What else can I do to get the full screen??
> knoppix screen=1280x800 just sets the "PreferresSize" in xorgs
> coniguration. This may be completely ignored if the monitor claims not
> to support this resolution. The resolutions shown with
>
> xrandr -q
>
> are relevant.
>
> You can use the lxrandr tool from the LXDE taskbar to set the
> resolution, or ths xrandr commandline tool.
>
> In some cases, the monidor or display lies about the supported
> resolutions and frequencies. In this case, you can cheat by enforcing a
> different "maximum frequency" for horizontal and vertical refresh:
>
> knoppix hsync=95
>
> allows a higher horizontal frequency, this has been reported to work on
> many TFT/graphics card combinations that otherwise are stuck at 1024x768
> because xorg does not get a response when asking the monitor for the
> optimal settings (can be caused by a KVM switch).
>
> The reason why it may have worked in 6.4.3 could be your monitor or
> graphics card being unsupported yet by the acellerated drivers,
> therefore a fixed resolution was used in vesa mode only. If you have an
> NVidia or ATI(Radeon) card, this may have been the case. With the newer
> xorg server, the settings are probed with higher pickyness in order to
> find the best (=fastest) setting - which sometimes produces better, and
> rather seldom produces worse results.
>
> Regards
> -Klaus
>
> > On 02/20/2011 09:59 AM, JD wrote:
> > > Dear all,
> > > Knoppix-6.4.4
> > > If I boot with
> > > boot: knoppix screen=1280x800
> > > it still boots with screen 800x600
> > >
> > > In 6.4.3, it did work.
> > >
> > > Thanx for your help.
> > >
> > > JD