On Mon, Jan 5, 2009 at 3:53 PM, Lief Hendrickson <[email protected]> wrote:
> At 02:41 PM 1/5/2009, James A. Sack wrote:
>>
>> Lief Hendrickson wrote:
>> > When I boot to Knoppix 5.1.1, I get a horizontal offset of the screen
>> > image of about 3.5 inches on the left side. i.e. there is a 3.5'" wide
>> > blank section on the left. The screen image goes past the right margin.
>> > This is after adjusting the max using the monitor's horizontal
>> > adjustment. The monitor is a 17" Viewsonic VA702b. The monitor works
>> > fine displaying text while Knoppix is booting. Any ideas of how to get
>> > the image centered? Thanks.
>> >
>>
>> Looks like that mon. is standard 4x3 format, and is supposed to do
>> 1280x1024 resolution.
>>
>> What does
>> xrandr
>> report for the highest and current (starred) resolutions?
>>
>> Regards,
>> ..jim
>
> By "highest", do you mean the last line (which is line 28)?
>
> xrandr reports:
>
> S2: Pixels Physical Refresh
> *0 1280x1024 (340mm x 271mm) *75
> ...
> 28 320x175 (342mm x 271mm) 85
Highest means the one with the biggest number of pixels.
Possibly your monitor can't cope with a refresh rate of 75Hz. That is
why I suggested setting the Knoppix control panel to 60Hz.
The Viewsonic spec sheet says it will do refresh rates as high as
85Hz. Nevertheless, since it is a LCD monitor and thus does not have
the flicker problem that CRT monitors have, there is no good reason
for choosing a refresh rate higher than 60Hz.
The Viewsonic Users Guide talks about the Auto Image Adjust button
(labeled Auto Set) and suggests that if that doesn't give a proper
image, lower the refresh rate to 60Hz.
Before trying this, does xrandr report any other lines with the
resolution 1280x1024 but different (lower) refresh rates? If I could
remember how to use xrandr to choose another display rate, I would try
to coach you through that. Perhaps Jim Sack is looking on.
carl
--
carl lowenstein marine physical lab u.c. san diego
[email protected]
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