Gentoo Archives: gentoo-amd64

From: DR GM SEDDON <gavin.m.seddon@×××××××××××××.uk>
To: gentoo-amd64@l.g.o
Subject: Re: [gentoo-amd64] Re: unknown monitor
Date: Sat, 19 Nov 2005 13:56:54
In Reply to: [gentoo-amd64] Re: unknown monitor by Duncan <>
Many thanks for this detailed reply, my monitor is a 20" sgi crt.  i 
prefer sgi we use them at work in drug design they give good 3d.  I have 
the hr and vs rates, where do I put these.Also, is the monitor name 
needed verbatim.  Finally, is there a tool for setting up my initial 
monitor type and card?  Since I'm apprehensive of my setup.

Duncan wrote:

>DR GM SEDDON posted <437F0FBC.6010908@×××××××××××××.uk>, excerpted below, >on Sat, 19 Nov 2005 11:42:52 +0000: > > > >>Hi I'm trying to configure my display. I have successfully created a >>xorg.conf file that works. However, I have tried to optimise my display >>as recommended in the manual. From 'lspci' my graphics card is >>unknown. It is an ATI radeon but I entered unknown. I have tried >>'Screen0' and 'default screen'. When I startx I get 'unknown monitor >>type' in the log. Can anyone advise? >>Gavin >> >> > >That's xorg trying to scan the DCC info from the monitor (as most modern >monitors should provide) and failing to get it. It's not complaining >about your graphics card (altho it's possible if it's using the wrong >driver that it won't be able to get the monitor info due to that), but >that your monitor isn't returning any info for xorg to use to set itself >up. > >The below info is for analog video cards and monitors. I'm not sure how >digital ones, lcd and the like, may differ, except that I know their >resolutions are typically lower for their size, they sell by displayed >size, not tube side, so a 19" CRT is usually about the same viewable size >as an 18" LCD (tho the LCD is lower max resolution), and they are more >expensive but not nearly as heavy or bulky! Oh, LCDs also tend to come in >widescreen ratios far more frequently than CRTs! > >The good thing (within context) about LCDs is that they are newer >technology, so often a newer product, meaning it's easier to find specs >for them. If it's a laptop, look for the laptop specs, and you'll get the >video card info at the same time! > >Since xfree86-4 and now with xorg, setting up monitors is generally pretty >easy, even if it can't get the info automatically, because xorg has >default resolution and timing modes that it will use, given the basics. > >man xorg.conf, take a look at the monitor section, then google your >monitor (if necessary) and get the necessary specs. I've done this with >more than half dozen used monitors that needless to say I had no manuals >for, thus no from the factory specs. They are generally fairly easy to >find, once you feed google the make and model number of your monitor. > >The numbers you will need: > >Horizontal sync, normally in KHz. Here's the numbers from one of mine, >from xorg.conf, to give you an idea of the range. (Don't just use mine, >if it's wrong and you let the monitor go for long, it can burn it out!) >High resolutions will use near the top end. The bottom end isn't used >much any more, unless you like to use xorg's ctrl-alt-numplus and numminus >sequences to zoom, as I often do, and want to get close to the min >resolution as well. > > HorizSync 30-110 > >Vertical refresh, normally in Hz. High resolutions will use lower numbers >here. The high end is the one not so often used any more. Note however >that most folks can't stand refresh rates below 60, and many need 75 or >better to be comfortable. Of course, that means you can't drive it to as >high a pixel-count resolution. Here, I can tolerate 60 Hz with dark >backgrounds and light text/foregrounds, so mostly dark. With a white >screen background, I need higher refresh rates, 68-75. Again, here's mine >to give you an idea, but don't just use mine. > > VertRefresh 50-180 > >Those will go in the Monitor section. You can use xorg's autosetup (there >are several choices for tools to try) to generate a basic xorg.conf, then >create or change the Monitor section as necessary. > >Two option but useful numbers for the same section, if you can find them. >Dotclock, usually in MHz (maximum typically runs ~230-ish with a decent >monitor), and DisplaySize in x and y mm. xorg usually does fine without >the former if you can't find it, by using the numbers above. The latter >is only used to ensure semi-normal font sizes, otherwise various versions >may change the default font size, if they can't find it and you didn't set >it, rather drastically, for the same settings in your X environment. >Thus, it's not vital, but it's nice to have, and usually pretty easy to >find, tho you might have to do a bit of inch/mm conversion (25.4mm/inch). > >The other place your monitor numbers come into play is in the Display >subsection of the Screen section, in the Modes listing. This is just a >listing of the main and any additional pixel resolutions you may desire >(that xorg agrees are possible given the settings for video card and >monitor). If your numbers are good enough, and your screen large enough, >2048x1536 is the highest practical resolution available (assuming the >standard 4x3 ratio) -- but only on 20" and larger monitors or it's >overkill. 1600x1200 is, however, often the rated maximum for the 19-22" >monitor size, and more comfortable for many, particularly as it allows a >higher refresh rate. (Monitors rated for 75 Hz refresh at their rated >maximum, however, can generally do 60 Hz at higher resolutions, if your >eyes can stand it, of course.) For a 19" monitor, 1280x920 resolution >(4x3 ratio) or 1280x1024, altho that gives you rectangular pixels. For a >17" monitor, 1280x1024 is high end, 1024x768 is standard. 15" do 1024x768 >and 800x600. Old and small monitors will generally do 640x480, 800x600 if >you are lucky and can tolerate the lower refresh. > >Here's one of my screen mode line entries, listing all the resolutions I >run (22" monitor, the highest normally resolution normally, lower ones for >zoom, using the zoom keys mentioned above, DisplaySize is 400x300mm, so at >that resolution, my pixels are a full mm square!). Most folks probably >don't have half that many resolutions (plus many won't want to run >2048x1536 at the refresh possible on their monitor, even if they can, so >that and the 1792 resolution won't be so common). Note that the 640x480 >resolution is square pixels, the 640x400 isn't, but I have a game that >runs that, so... That one is also a custom modeline, as well, as it's not >one that xorg has preconfigured. > >Modes "2048x1536" "1792x1344" "1600x1200" "1280x960" "1152x864" "1024x768" "800x600" "640x480" "640x400" "512x384" "400x300" "320x240" > >It should be easy to find the maximum resolution for your monitor, as >that's one of the selling features, so even hits that don't list anything >else often list that. > > >
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Subject Author
[gentoo-amd64] Re: Re: unknown monitor Duncan <1i5t5.duncan@×××.net>