Date: Sun, 29 Jun 1997 23:56:04 -0400 From: Mark Mayo <mark@quickweb.com> To: Michael Smith <msmith@atrad.adelaide.edu.au> Cc: Mark Mayo <mark@quickweb.com>, multimedia@FreeBSD.ORG Subject: Re: Monitor shadows? Message-ID: <19970629235604.59136@vinyl.quickweb.com> In-Reply-To: <199706300050.KAA22072@genesis.atrad.adelaide.edu.au>; from Michael Smith on Mon, Jun 30, 1997 at 10:20:14AM %2B0930 References: <19970629195452.32243@vinyl.quickweb.com> <199706300050.KAA22072@genesis.atrad.adelaide.edu.au>
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On Mon, Jun 30, 1997 at 10:20:14AM +0930, Michael Smith wrote: > Mark Mayo stands accused of saying: > > > Hi. I'm noticing a strange thing happening on my computer. At higher > > refresh rates (above 72Hz), I see what I can only describe as > > "shadows". For example, the borders of windows seem to have a little > > grey fading border on the right side. If the mouse is over a simple > > green background, I can really see the "shadow". It's quite annoying > > - even the black letters on the white background of my rxvt leave a > > little grey silhouette to the right. [SNIP] > > Yes, many times. It's an indication that you've exceeded the video > bandwidth of your monitor, either because you are overdriving it > frequency-wise, overdriving it signal wise (so the input amplifiers > are driven into clipping), or because the bandwidth has degraded, > often due to aging of capacitors (particularly electrolytics). > [SNIP] > > > MAG Innovision MX17F G (the one with the LCD thing on the front). Same > > I've got one of them; bleagh. Mostly mine is just fading; it jitters > a little too, but it certainly isn't ringing or smearing, and I drive > it pretty hard at times. Several people have suggested that my problem may just be a crappy (improperly shielded) VGA cable. I'm going to get a new cable and see if that is in fact the problem - I would be a happy man indeed if I can fix this problem with a new cable (read: it won't cost me much!). I'm pretty sure I'm within the refresh limits of the monitor, since it just shuts itself off and says the signal is out of range when I try something really high -- I have no idea how I'd tell if I'm overdriving the thing signal wise (I'm assuming you're talking about impedence or signal amplitude?). I can't picture how the ampliers could ever get into a state where clipping would occur, in any reasonably intelligent monitor (which I would say the MAG is)... Since you also have the MX17FG, do you happen to know how hard it can be driven? It seems like I'm the only person in the universe (aside from you) that actually has one of these things. None of the driver info files I've seen that specify refresh rates (in AccelX, NT, or 95) have info specific to the MX17FG - only the "MX17", and the "MXP17F". I lost the manual that came with the thing... I'm assuming the "MX17FG" that I have is somewhere in the middle, since the MXP17F is defined as having a max vert. refresh of 75Hz for just about every frequency. My definitions for the MX17 say it can do 76Hz at 1152x864, but only 70Hz at 1024x768. I know my MX17FG can do 76Hz at 1024x768, but 75Hz is the max at 1152x864. It's sort of weird, since if I tell it to do 75Hz, it's fine but and the LCD says it's running at "75.5Hz", but if I try 76Hz I get an out of range message (at 1152x864). Anyways, if you have some info on this I'd appreciate it. Otherwise, I'm fairly happy with the Mag - the Moire effects are quite bad at times, but the display is crisp and the refresh rates are acceptable. If the new cable fixes my shadows, I'll be happy! -Mark > > > Mark Mayo mark@quickweb.com > > -- > ]] Mike Smith, Software Engineer msmith@gsoft.com.au [[ > ]] Genesis Software genesis@gsoft.com.au [[ > ]] High-speed data acquisition and (GSM mobile) 0411-222-496 [[ > ]] realtime instrument control. (ph) +61-8-8267-3493 [[ > ]] Unix hardware collector. "Where are your PEZ?" The Tick [[ -- ---------------------------------------------------------------------------- Mark Mayo mark@quickweb.com RingZero Comp. http://vinyl.quickweb.com/mark finger mark@quickweb.com for my PGP key and GCS code ---------------------------------------------------------------------------- University degrees are a bit like adultery: you may not want to get involved with that sort of thing, but you don't want to be thought incapable. -Sir Peter Imbert
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