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senectus
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 Posted: Mon Jun 07, 2004 9:03 pm Post subject: LCD screen looks all grainy and crap :? |
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I've recently installed Gentoo on my Thinkpad laptop.. its running the latest (in portage) of xfree.
The default resolution for this LCD is 1600x1200 and I got that part working (at 60hz ??) but for some reason both Gnome, GDM, KDM and KDE all look really grainy and crap when I load them up..
The console looks fine.. it just seems to be something to do with X.
Any idea what I should be looking for?
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curtis119
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| Posted: Mon Jun 07, 2004 11:40 pm Post subject: |
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1024x768 is the recommended display depth on Thinkpads. If you're setting it any higher then you are probably damaging the LCD and/or the video card. I can't remeber where I read it (I tried googling around and couldn't find it) but I read that even the newer thinkpads(t40) are only supposed to run at 1024x768, even though the video card supports a higher resolution. This is true even for windows machines.
You can also try increasing the brightness. Hold down the Fn key in the lower left corner and then press the home key a couple of times.
You can also check the integrity of the video card by hooking up an external monitor to the out port and hold down Fn and press F7.
As to the 60hz thing. All LCD screens run at 60hz.
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senectus
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| Posted: Mon Jun 07, 2004 11:49 pm Post subject: |
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I have an A31p Thinkpad with a 15" XVGA LCD.. The NATIVE res on this LCD is 1600x1200, If I drop it back it looks like complete shite.. even in windows.. trust me.. the LCD is MEANT to run at 1600x1200
(besides.. I've been running this laptop at that res for over 2 years) 
Even the IBM auto configure software says that this is its default res.
Brightness is fine..
I'm beginning to think that its the colour depth... Next time i get to reboot I'll check that..
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curtis119
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| Posted: Tue Jun 08, 2004 12:34 am Post subject: |
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cool. Like I said I read that "somewhere" on the net. Sometimes pulling information out of my ass like that is not the best thing. 
I still think that hooking up an external monitor to test is a good idea.
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senectus
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| Posted: Tue Jun 08, 2004 1:11 am Post subject: |
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| curtis119 wrote: | cool. Like I said I read that "somewhere" on the net. Sometimes pulling information out of my ass like that is not the best thing.
I still think that hooking up an external monitor to test is a good idea. |
Will do.. thanks..
Sorry I didn't mean to appear snappy
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curtis119
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| Posted: Tue Jun 08, 2004 1:43 am Post subject: |
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That's cool. I have a thinkpad T30 and 1024x768 is the max resolution. IBM's website also says that 1024x768 is the max resolution for all thinkpads. By the way, did you figure it out? Was it the depth?
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senectus
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| Posted: Tue Jun 08, 2004 8:46 am Post subject: |
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Yeap.. I added "default depth 24 " and all is happy
Why is is that in windows its 32 bit colour and under linux its 24 bit ??
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curtis119
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| Posted: Tue Jun 08, 2004 7:16 pm Post subject: |
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| senectus wrote: |
Why is is that in windows its 32 bit colour and under linux its 24 bit ?? |
this article has good info on that question:
http://www.mustek.com/Class/resol_clrdepth.html
Here is an excerpt:
| Code: |
All computer monitors use dots of red, green and blue to represent the colors of an image. Current Video Card technology only allows 256 intensity levels for each of these dots. Therefore, current computer monitors can only display 24-bit color or 16.77 million colors. I doubt that this will ever change because the human eye cannot distinguish more colors than this. There also would be a quadruple increase in file sizes which would clog the "arteries" of your computer if video card technology advances to 48-bit technology (the next logical step). Keep this 24-bit limitation of your video card in mind as it is quite important when we get to the discussion of 30-bit and 36-bit scanners.
Video cards allow you to run your monitor in several different modes. You can set your monitor to display 16 colors, 256 colors, 16-bit color (65,000 colors) and 24-bit color (16.77 million colors). Some video cards have a 32-bit mode, but this is merely a speed trick. Computers move information in 16-bit or 32-bit chunks. When a video card allows 32-bit mode, it is storing 24-bits of color information in 32 digits merely to make data transfers faster. The extra 8-bits contain null information.
The amount of colors your computer monitor can display is dependent entirely on the video card you have installed. If your computer is more than 4 years old, you probably don't have a 24-bit capability. Most machines purchased within the last few years are capable of displaying 24-bit color.
The amount of RAM on your video card limits the color depth for each resolution of your monitor. Most current video cards can display resolutions up to 1,024 x 768. That is 1,024 pixels horizontally by 768 pixels vertically. (A pixel is one set of three dots, one each of red, green and blue. A pixel can display one dot produced by the scanner.) If your video card has 1MB of RAM, you can display 24-bit color at 640 x 480 resolution. If you set a 1MB video card to 800 x 600 pixels, you will only be able to display 16-bit color. If your video card has 2MB of RAM, you can display 24-bit color at 800 x 600 resolution. It takes 4MB of RAM on your video card to display 24-bit color at 1,024 x 768 resolution. |
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