I experienced such problems in a couple of cases which had nothing to do with config or any other
software related problems:
- proximity to *normal size* loudspeakers (motors would also do)
- lousy filtering in the power supply
>From your description I would assume the second one is at fault, unless you are less than 2 feet
away from both your frige and your air conditionning
The official way out would be to buy a filter for your electrical line, such filters should not be
very expensive...
The unofficial way (if you cannot find any commercial filter) would be to build it yourself:
you would need two .1 microfarad 630 volts capacitors (230 volts) (in the US 400V would suffice
with a 110V line) and two coils made of thick copper wire if possible coated (i.e. insulated) each
about five turns 1/2" diameter. you solder the capacitors between the two starts and the two ends
of the coils
_____/\ /\ /\ /\_____
| \/ \/ \/ |
line-> === .1 === .1 ->computer / monitor
___|_/\ /\ /\ /\_|____
\/ \/ \/
WATCH OUT the circuit IS connected to the line!!! i.e. you have 110V or 230V there you MUST encase
it so that there is no chances of anyone (yourself for instance) zapping himself/herself
Good luck
Lionel
--- xfree-xpert-subscriber2@xxxxxxx wrote:
> Hi,
>
> XF86-4.3 (from Mdk 9.1 distro), on-board chip SiS 630 (PCI ID 1039:6300 (rev 31) )
> Monitor: 19" Future Power.
>
> Problem :
> My monitor image "shakes" (about 0.1mm left-right, I
> guess, at aboout 30Hz, I guess ?), especially when the
> fridge or airconditioner comes on. (This is most visible
> when a lot of white is displayed, such as when browsing.
> When black xterm covers the whole screen, it is not as
> noticable.)
>
> This is at 1280x1024.
> XVidtune says:
> Vendor: Plug'n Play, Model:
> Num hsync: 1, Num vsync: 1
> hsync range 0: 30.00 - 110.00
> vsync range 0: 50.00 - 150.00
>
> For 1280x1024 :
> Horizontal Sync Vertical Sync
> 79.73kHz 74.79Hz
> "1280x1024" 135.22 1280 1296 1440 1688 1024 1025 1028 1066 +hsync +vsync
>
> When I switch : Ctrl-Alt-+ to lower 1280x960, the screen is
> brigher, sharper, and, most importantly, doesn't shake any
> more .. just perfect ! Xvidtune says:
> Horizontal Sync Vertical Sync
> 60.10kHz 60.10Hz
> "1280x960" 108.18 1280 1376 1488 1800 960 961 964 1000 +hsync +vsync
>
> So I'm guessing the image is shaking due to interference
> of AC (North American 60hz) and Vertical Sync Freq (some
> interference at 74.79Hz but none at 60.10Hz). Is this the
> right guess ?
>
> If this is right, is there a way to tell X to go at 60Hz
> at 1280x1024 ? (It's nice to have that bit of an extra real
> estate ...) Or, even, is there a way to fine-tune it to
> higher freqs, so there is no flicker effect, *and* keep
> fine-tuning the frequency until ther is no shaking either ?
>
> Any suggestions as to how I could stop the image from
> shaking at 1280x1024 - no, I cannot get rid of my monitor,
> fridge, air conditioner, or other life-sustaining devices :)
> - would be most appreciated.
>
>
> Thanks a bunch in advance,
>
> John
>
>
> --
> -- Gospel of Jesus' kingdom = saving power of God for all who believe --
> ## To some, nothing is impossible. ##
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