I don’t have a problem with graphics resolution:
openSUSE (oS) selects 1280x1024, which is fine for my LCD.
BUT the contents on the screen are flickering, shifting, vibrating …
which is due to the refresh rate, 60Hz (for the screen as a whole).
The refresh rate should be at 75Hz, at which I get a perfectly stable picture
using the very same LCD under windows ME on the same machine,
or even when I connect it to a totally different machine - an old G3 Mac !
Could I - by any means - get oS 11.2 to select the corresponding
graphics mode with 75Hz refresh rate ?
Or is this issue resolved or is there a workaround in oS 11.4
(which I could possibly install) ?
My PC hardware is outdated:
an old Intel motherboard with onboard graphics and Pentium II.
No Nvidia or ATI yet.
On 2011-11-07 23:26, ratzi wrote:
> Is openSuse 11.4 different in this respect ?
No.
In gnome I see an applet where I can choose the resolution.
On the other hand, a refresh rate of 60Hz can not cause the image to
vibrate that much as you say. It may flicker slightly, some people see it
more than others. My display is at V: 60Hz (H: 67Khz), has 24 inches,
1920*1080 pixels, and I can’t see any flicker at all.
A CRT would, but LCDs do not flicker even at low refresh rates.
–
Cheers / Saludos,
Carlos E. R.
(from 11.4 x86_64 “Celadon” at Telcontar)
Yes, that’s exactly what I thought until I connected the LCD.
The funny thing is that the CRT connected beforehand didn’t
show any of these effects.
The effects on the LCD are different: it’s like the text or the graphics
all the time are moving quickly within a small range.
May be that it’s a bug of the LCD in the end (connected by VGA).
But on the other hand, at a 75Hz refresh rate the effects don’t occur,
as the tests with windows ME or with MacOS 9 on the G3 show
(where I’m able to choose the refresh rate).
Hmmm.
I’m still using KDE.
Perhaps I should switch.
I thought it was a thing introduced by X11 in the end.
Am I wrong ?
And I hoped that there would be a workaround in openSUSE 11
with KDE.
>
> Yes, that’s exactly what I thought until I connected the LCD.
>
> The funny thing is that the CRT connected beforehand didn’t
> show any of these effects.
>
> The effects on the LCD are different: it’s like the text or the graphics
> all the time are moving quickly within a small range.
I would suspect cables, or sockets.
> May be that it’s a bug of the LCD in the end (connected by VGA).
> But on the other hand, at a 75Hz refresh rate the effects don’t occur,
> as the tests with windows ME or with MacOS 9 on the G3 show
> (where I’m able to choose the refresh rate).
Weird. Quite weird.
It has to be a hardware problem, but I don’t know what. Maybe the LCD has a
failure mode that triggers at that frequency. Different circuits, perhaps.
> robin_listas;2401479 Wrote:
>>
>> In gnome I see an applet where I can choose the resolution.
>>
>
> Hmmm.
> I’m still using KDE.
> Perhaps I should switch.
There has to be a KDE equivalent tool, I’m sure.
> I thought it was a thing introduced by X11 in the end.
> Am I wrong ?
You are right. X11 autodetects hardware and makes the most of it -
hopefully. But applications on the desktop can modify the settings, they
thought.
> And I hoped that there would be a workaround in openSUSE 11
> with KDE.
There has to be a gadget, but as I don’t usually use KDE I’m not familiar
with it.
–
Cheers / Saludos,
Carlos E. R.
(from 11.4 x86_64 “Celadon” at Telcontar)
Great hint, despite the fact that my descriptions of behaviour wasn’t (an couldn’t be)
conclusive in every aspect.
Yes, it was the VGA cable, which I found out after several hours of reboots
and changes of configuration.
When I attached the LCD to a G3 Mac beforehand, I used a different VGA cable.
That no problems occurred booting windows ME on the same PC using the same
hardware configuration was just luck.
Which on the other hand posed an additional difficulty to someone like you who
should try to resolve my problem.
Last night I first exchanged the LCD by a second LCD that I have, but the symptoms
remained the same.
Then, after some hours, I exchanged the VGA cable, which then resulted in a perfectly
stable picture.
The reason that the CRT was better simply as well was, that a different cable was used.
>
>resolved
>
>Dear Carlos,
>
>robin_listas;2401489 Wrote:
>>
>> I would suspect cables, or sockets.
>>
>
>Great hint, despite the fact that my descriptions of behaviour wasn’t
>(an couldn’t be)
>conclusive in every aspect.
>
>Yes, it was the VGA cable, which I found out after several hours of
>reboots
>and changes of configuration.
>
>When I attached the LCD to a G3 Mac beforehand, I used a different VGA
>cable.
>
>That no problems occurred booting windows ME on the same PC using the
>same
>hardware configuration was just luck.
>Which on the other hand posed an additional difficulty to someone like
>you who
>should try to resolve my problem.
>
>Last night I first exchanged the LCD by a second LCD that I have, but
>the symptoms
>remained the same.
>
>Then, after some hours, I exchanged the VGA cable, which then resulted
>in a perfectly
>stable picture.
>
>The reason that the CRT was better simply as well was, that a different
>cable was used.
>
>Thank you very much!
>Mike
