Date: Tue, 4 Aug 1998 16:51:01 +0930 From: Greg Lehey <grog@lemis.com> To: Brian Somers <brian@Awfulhak.org> Cc: Randy Philipp <cphilipp@pop500.gsfc.nasa.gov>, Doug White <dwhite@resnet.uoregon.edu>, freebsd-mobile@FreeBSD.ORG Subject: Re: Neomagic chipset - is it a hardware problem ? Message-ID: <19980804165101.Y25942@freebie.lemis.com> In-Reply-To: <199808040704.IAA25263@awfulhak.org>; from Brian Somers on Tue, Aug 04, 1998 at 08:04:28AM %2B0100 References: <199807252032.VAA00175@awfulhak.org> <199808040704.IAA25263@awfulhak.org>
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(trimmed -ports) On Tuesday, 4 August 1998 at 8:04:28 +0100, Brian Somers wrote: >> [.....] >>> As for sending you my binary, I would like to test it myself before >>> I start giving it out to people. >> >> I've built this driver into XF86_SVGA (albeit with all the other >> drivers too - rather than just ``generic'') and I can get X up at 16 >> bits in 800x600, *but* I get a lot of horizontal lines across my >> screen - kind of like a huge thin horizontal smear (it's not there >> when an empty xterm takes up the entire screen, but when I add some >> text, I start getting the lines). >> >> I've tried changing the Frequency from 40.0 - to no avail. This has >> obviously got nothing to do with it. >> >> I know very little about X - perhaps someone can say ``Ahh, those >> horizontal lines are because....'' (and fill in the ....) ? >> >> FWIW, the text in the xterm is crystal clear at 16 bpp, but the >> characters are like blobs of mud at 8 bpp. > > I've found out more about this flickering problem.... it only occurs > when the laptop is physically warm - the warmer, the more flickering. > If the machine sleeps for ~15 minutes, it'll wake up with a perfect > picture and that picture will start to deteriorate with the building > heat. If I switch the display off for 15 minutes it makes no > difference. > > This is all under load. If the machine is idle it lasts a lot > longer (the fan is more effective I guess....) > > Has anyone else seen this problem ? I'm pretty much convinced that > it's a hardware problem now, so I'll probably return the machine > (second time) nearer the end of the week. I don't know too much about laptop displays, but if that were to happen on a glass monitor, I'd guess you're driving it out of spec. I know you can fry monitors; maybe you can fry laptop displays. In your position I'd seriously consider reviewing the display parameters. Greg -- See complete headers for address and phone numbers finger grog@lemis.com for PGP public key To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-mobile" in the body of the message
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