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Flash
Official Dog Handler

Joined: 04 May 2005 Posts: 12823 Location: Arizona USA
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Posted: Wed 28 Nov 2007, 12:33 Post subject:
Xorg video resolution depends on display? |
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I don't know if this is a bug. It seems like one to me.
I have a Viewsonic N3250W LCD display, which has a maximum resolution of 1360 x 768. My neighbor has some other brand of plasma display but which has the same maximum resolution.
While showing off her new display, my neighbor had mentioned she would like to use it as a computer monitor. I have several old computers gathering dust, so I told her I'd see if one would do what she wanted. First I connected it to my LCD display, to test it and to set up a multisession Puppy DVD for her. Xorg reported that my display was capable of 1360 x 768 but that the video card (on-board Intel 815) might not be. Sure enough, the maximum resolution that would work was 1024 x 768 (or something like that.)
Imagine my surprise when the same computer worked my neighbor's 1360 x 768 plasma display at its full resolution.
Can anyone suggest why Xorg works my neighbor's display at 1360 when it will only work mine at 1024, using the same computer?
(By the way, my neighbor took to Puppy like a duck to water. )
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Béèm

Joined: 21 Nov 2006 Posts: 11775 Location: Brussels IBM Thinkpad R40, 256MB, 20GB, WiFi ipw2100. Frugal Lin'N'Win
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Posted: Wed 28 Nov 2007, 15:42 Post subject:
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[OT]
Is your neighbor female?
[/OT]
Seriously now, I can't see a reason why this is so.
Bad connection when you tried at home?
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Leachim
Joined: 27 May 2007 Posts: 229
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Posted: Wed 28 Nov 2007, 19:58 Post subject:
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It might depend on the video driver. Look for the Driver-entry in the Device-Section of xorg.conf. Some drivers do only support resolutions with 4:3 ratios.
Another problem might araise from missing information about the display. Try ddcprobe on both displays. This will show you what possible resolutions the displays report.
I'm interested in gathering as much information about (problematic) graphics adapter / display combinations as possible for the "New X-Wizard" project. (see: http://www.murga-linux.com/puppy/viewtopic.php?t=23468)
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Flash
Official Dog Handler

Joined: 04 May 2005 Posts: 12823 Location: Arizona USA
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Posted: Thu 29 Nov 2007, 00:58 Post subject:
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Thanks, leachim. I'll post the results of ddcprobe to this thread as soon as I can run it on both displays from the computer in question. It will be from Puppy 3.01, as ddcprobe locked up my computer when I ran it in Dingo 392.
Is there any other information you would like as well?
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Leachim
Joined: 27 May 2007 Posts: 229
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Posted: Thu 29 Nov 2007, 06:46 Post subject:
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If you could dowload lspci and the pci-hardware-description file as described in my X-Wizard thread and then run lspci and ddcprobe and post the results this would be absolutely great!
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Bruce B
Joined: 18 May 2005 Posts: 11488 Location: The Peoples Republic of California
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Posted: Mon 10 Dec 2007, 20:02 Post subject:
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Flash,
See what you can learn about the 915resolution hack included with Puppy.
It's made for those cards, I don't have an equivalent card to test with, but I think it's supposed to solve problems of this nature.
Run on CLI 915resolution
For starters, the maybe Google for more specifics.
Bruce
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Flash
Official Dog Handler

Joined: 04 May 2005 Posts: 12823 Location: Arizona USA
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Posted: Sun 23 Dec 2007, 23:02 Post subject:
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Results of running ddcprobe in Puppy Dingo4 alpha3 on a Gigabyte GA-MA69GM-S2H motherboard with onboard video, connected to my Viewsonic N3250w display via HDMI:
# ddcprobe
vbe: VESA 3.0 detected.
oem: ATI ATOMBIOS
vendor: (C) 1988-2005, ATI Technologies Inc.
product: RS690 01.00
memory: 16384kb
mode: 640x400x256
mode: 640x480x256
mode: 800x600x256
mode: 1024x768x256
mode: 1280x1024x256
mode: 640x480x64k
mode: 800x600x64k
mode: 1024x768x64k
mode: 1280x1024x64k
mode: 320x200x64k
mode: 1600x1200x256
mode: 1600x1200x32k
mode: 1600x1200x64k
edid:
edid: 1 3
id: 101c
eisa: VSC101c
serial: dadb6101
manufacture: 46 2005
input: analog signal.
screensize: 70 39
gamma: 2.200000
dpms: RGB, active off, no suspend, no standby
timing: 720x400@70 Hz (VGA 640x400, IBM)
timing: 640x480@60 Hz (VGA)
timing: 640x480@75 Hz (VESA)
timing: 800x600@75 Hz (VESA)
timing: 1024x768@87 Hz Interlaced (8514A)
timing: 1024x768@75 Hz (VESA)
ctiming: 1280x1024@60
ctiming: 640x640@70
dtiming: 1360x768@70
monitorserial: PS40546C0807
monitorrange: 30-64, 60-75
monitorname: N3250w
#
My neighbor is gone until after Christmas so it will be a while before I can run ddcprobe on her display.
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raffy
Joined: 25 May 2005 Posts: 4839 Location: Manila
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Posted: Mon 24 Dec 2007, 00:00 Post subject:
915resolution |
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The 915resolution trick is being discussed here:
http://murga-linux.com/puppy/viewtopic.php?t=24814
What it does is to run this in console: 915resolution -l
(that's an L)
and then pick a number for assigning your chosen resolution (38 has been suggested for 800 px wide resolution): 915resolution 38 xxx yyy colordepth. For my example, I used 915resolution 43 800 480 16
_________________ Puppy user since Oct 2004. Want FreeOffice? Get the sfs (English only).
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Dougal

Joined: 19 Oct 2005 Posts: 2504 Location: Hell more grotesque than any medieval woodcut
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Posted: Tue 25 Dec 2007, 09:28 Post subject:
Re: Xorg video resolution depends on display? |
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Flash wrote: | Can anyone suggest why Xorg works my neighbor's display at 1360 when it will only work mine at 1024, using the same computer? |
It might have to do with the refresh-rates your screen works at: the xorgwizard makes a very conservative estimate of the rates, but in some cases it might be wrong.
Some LCD screens work at 20 Hz (or whatever it is), while Puppy usually won't allow it to go beneath 30 or something.
There's also the matter of 1360 vs 1366 and all that -- I can't remember the details now...
_________________ What's the ugliest part of your body?
Some say your nose
Some say your toes
But I think it's your mind
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