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Date:      Tue, 04 Aug 1998 07:24:15 -0700
From:      Mike Smith <mike@smith.net.au>
To:        Brian Somers <brian@Awfulhak.org>
Cc:        Randy Philipp <cphilipp@pop500.gsfc.nasa.gov>, Doug White <dwhite@resnet.uoregon.edu>, Greg Lehey <grog@lemis.com>, freebsd-mobile@FreeBSD.ORG, freebsd-ports@FreeBSD.ORG
Subject:   Re: Neomagic chipset - is it a hardware problem ? 
Message-ID:  <199808041424.HAA00456@antipodes.cdrom.com>
In-Reply-To: Your message of "Tue, 04 Aug 1998 08:04:28 BST." <199808040704.IAA25263@awfulhak.org> 

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> 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've seen similar symptoms on a Toshiba using the C&T 65555.  The part 
would misbehave so badly that the X server would crash.

Windows worked OK on it though; my hypothesis was just that the X 
driver wasn't doing whatever power management stuff the Windows driver 
was, and so the chip was overheating.  I could be way off on that 
though; I know nothing about the C&T architecture.

-- 
\\  Sometimes you're ahead,       \\  Mike Smith
\\  sometimes you're behind.      \\  mike@smith.net.au
\\  The race is long, and in the  \\  msmith@freebsd.org
\\  end it's only with yourself.  \\  msmith@cdrom.com



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