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 Forum index » Advanced Topics » Hardware » Video
'Dancing hairlines' on 1600x1200 screen in Puppy 4.21
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jpr

Joined: 01 Apr 2009
Posts: 102

PostPosted: Wed 04 Nov 2009, 19:34    Post_subject:  'Dancing hairlines' on 1600x1200 screen in Puppy 4.21  

Hi all,
I have a Dell Latitude C810 laptop. Video card: NVIDIA GeForce2 Go. Video memory: 32MB LCD screen: 1600x1200 pixels
When I run Puppy-421, I get some white hairlines popping along the left vertical edge of the screen. Each line may show for a split second and disappear. There may be 20-70 lines at any given moment. It kind of looks like they are 'dancing' along the screen edge. Lines are horizontal and less than 1/2 inch (12mm) long. The rest of the screen appears fine.
I have xorg settings set to 1600x1200 resolution, 16 bit.
This problem does not happen in Windows XP.
What could it be?

Thank you.
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Aitch


Joined: 04 Apr 2007
Posts: 6825
Location: Chatham, Kent, UK

PostPosted: Wed 04 Nov 2009, 20:52    Post_subject:  

Try using xorg wizard and change the refresh rate

This is known as tearing, usually when the refresh rate is set wrong

Also try reducing to 1280x1024, - your PC may need 1024x768 or lower

Old, but informative video settings info site

http://www.ibiblio.org/pub/Linux/docs/HOWTO/XFree86-Video-Timings-HOWTO

Aitch Smile
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jpr

Joined: 01 Apr 2009
Posts: 102

PostPosted: Thu 05 Nov 2009, 00:18    Post_subject:  

I tried 1280x1024 resolution and it removed the hairlines but then I had a black border and was not using the full screen.
Windows is using 60Hz refresh rate. But, probably more importantly, it uses the correct driver from NVIDIA.
I tried tweaking refresh rate in xorg.conf. The only times it helped was when a new refresh rate forced the screen to a lower resolution, again resulting in black border.
I also tried the generic video driver in xorgwizard, but the screen was too distorted. I could only see about half of the dialog box.
Here is some info from xorgwizard at 1600x1200x16 resolution:
Code:
Horizontal frequency: 74.01KHz
Refresh frequency: 59.92KHz
The current driver being used by Xorg is 'nv'
board info: 'NV11 [GeForce2 Go]'

Vertical frequency in xorg.conf is set to 60. But it looks like the actual frequency is 59.92 Could this be the problem? How do I force it to a 60.00?

Thank you.
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Aitch


Joined: 04 Apr 2007
Posts: 6825
Location: Chatham, Kent, UK

PostPosted: Thu 05 Nov 2009, 07:50    Post_subject:  

Hi jpr

Not sure what the correct driver is for that card, though see it's using NV - there may be a better Nvidia one

Also try Big-Bass's slaxer_pup as it seems to have a different xorg

http://www.murga-linux.com/puppy/viewtopic.php?p=296593#296593

If it gives any details about the driver/works better and you want to use your existing pup we may be able to locate a better driver

Aitch Smile
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jpr

Joined: 01 Apr 2009
Posts: 102

PostPosted: Thu 05 Nov 2009, 23:37    Post_subject:  

Thank you, Aitch.
Until I sort this hairline/tearing business out, is it safe to run Puppy like this? Can a wrong driver damage the video card or display?
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Aitch


Joined: 04 Apr 2007
Posts: 6825
Location: Chatham, Kent, UK

PostPosted: Sat 07 Nov 2009, 10:09    Post_subject:  

To be honest, I don't know if it will cause any damage, but it isn't right, that's for sure

Try the other recommended puppy variants, including maybe ttuuxxx's 214xx

http://www.murga-linux.com/puppy/viewtopic.php?t=42553

......as different kernel/drivers are in different puppy's and it's probably best to find one that doesn't tear, and get driver details from there

Aitch Smile
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jpr

Joined: 01 Apr 2009
Posts: 102

PostPosted: Fri 20 Nov 2009, 14:03    Post_subject:  

Hi,
I just tried a xubuntu-9.10 live cd and video was good on it.
Is it possible to find out which driver xubuntu uses and install the same driver on Puppy?

Is this the link to the latest Slaxer?
http://puppylinux.asia/tpp/big_bass/Slaxer_pup%20ISO/Slaxer_Pup-412.iso

Thank you.
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Aitch


Joined: 04 Apr 2007
Posts: 6825
Location: Chatham, Kent, UK

PostPosted: Fri 20 Nov 2009, 15:06    Post_subject:  

yes, should be possible, though I know nothing about *buntu

Puppy uses hardinfo or a cli call, like
Code:
lspci,
which should work in *buntu

try it!

& yes, that is the latest slaxer link, I believe, but this is Joe's slaxer page, which only has his Slaxer_Pup-4.12_USB.iso with a different initrd.gz [see note]

HTH

Aitch Smile
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jpr

Joined: 01 Apr 2009
Posts: 102

PostPosted: Sun 22 Nov 2009, 02:24    Post_subject:  

I just tried Puppy-431 and unfortunately I got the same problem with video.
By the way, as in Puppy-421, the hairlines get more pronounced when I have a white object in a certain area on the screen.
Divide the screen into four equal columns, and name them one to four, from left to right. Now if I place a white or a light-colored object in column three, the hairlines get worse.
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Aitch


Joined: 04 Apr 2007
Posts: 6825
Location: Chatham, Kent, UK

PostPosted: Sun 22 Nov 2009, 03:17    Post_subject:  

Do you have a different monitor to try?

It may just be the monitor itself?

Aitch Smile
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jpr

Joined: 01 Apr 2009
Posts: 102

PostPosted: Sun 22 Nov 2009, 11:32    Post_subject:  

Some of this may be monitor's fault. But this being a laptop, I will have to use it. I don't want to replace the display. Besides, it works well in win xp and xubuntu.
I guess my next step is to try slaxer pup.
And if that fails, I will try to figure out a way to get xubuntu's video driver installed on puppy.
What constitutes a video driver? Is it just a file I can copy? Where are the video drivers located in puppy? How do I make xorg use a particular driver?

Thank you.
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Aitch


Joined: 04 Apr 2007
Posts: 6825
Location: Chatham, Kent, UK

PostPosted: Sun 22 Nov 2009, 12:00    Post_subject:  

It seems this is a known problem, but there probably IS an nvidia driver with DRI acceleration

http://www.nvnews.net/vbulletin/showthread.php?t=43577

maybe try
Code:
puppy acpi=off
at bootup

there is a later xorg pet, worth a try?

http://www.murga-linux.com/puppy/viewtopic.php?p=353247

maybe tempestuous might know? try pm'ing him

Aitch Smile
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Flash
Official Dog Handler


Joined: 04 May 2005
Posts: 11125
Location: Arizona USA

PostPosted: Sun 22 Nov 2009, 12:21    Post_subject:  

Also check here for a newer video driver.
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jpr

Joined: 01 Apr 2009
Posts: 102

PostPosted: Sun 22 Nov 2009, 12:58    Post_subject:  

No joy downloading http://puppylinux.asia/tpp/big_bass/Slaxer_pup%20ISO/Slaxer_Pup-412.iso
I could not get wget to do it. Error 404: Not found.
Downloading from a browser stopped at 12MB and said download in finished.
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jpr

Joined: 01 Apr 2009
Posts: 102

PostPosted: Sun 22 Nov 2009, 14:06    Post_subject:  

I went to http://www.murga-linux.com/puppy/viewtopic.php?t=48019
and installed package xf86-video-nv-2.1.15-i486.pet
Still no changes in video.
xorgwizard says that 'nv' driver is being used. If I should be using a different driver after installing the package, how do I do it?
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