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Re: X Server/mouse problems



I have the exact same problem with my Intel/Malenium/Viewsonic 21"/Metro-X

On Fri, 25 Sep 1998 Jay.Estabrook@digital.com wrote:

> 
> >>> dr john halewood said:
> > 
> >  Basic problem: got a pretty much stable system that's got a glitch on
> > the X server. Specifically the 
> > screen twitches/blinks/occasionally resets when the mouse is moved. I've
> > never caught it doing it
> > when the mouse is stationary (although that's no guarantee of anything).
> 
> Perhaps the monitor is sensitive to the work of the Xserver when updating
> the cursor image? Try adding:
> 
> 	Option	"sw_cursor"
> 
> to the Devices section of the XF86Config, see if that helps. Updating a
> hardware cursor sometimes needs to be synchronized to vertical retrace,
> or shutoff of video for an instant, which may be causing this problem.
> 
> > At the same time i get that
> > good ol' familiar statement in /var/log/messages:
> > 
> > Sep 25 16:06:19 frumious kernel: X(301): unaligned trap at
> > 000000012004e40c: 00000001206140cb 28 1
> > 
> > This has been pretty consistent throughout despite me having gone
> > through the stock X (SVGA) server
> > from the RH5.1 install, a couple I built myself (different variations of
> > 3.3.2) and a binary from
> > ftp://mea.tmt.tele.fi/. Underneath that I've run 2.0.34, 2.0.35 and
> > 2.1.119 kernels (mostly w/egcs1.1b &
> > haifa scheduler enabled which works fine on this box).
> 
> Uh, have you tried tracking down where those unaligned accesses are coming
> from? If you have one of those servers that you built, you could run GDB on
> it...
> 
> Also, you may get more of those depending on which compiler you are
> using; the 2.7.2.3 (old) seemed to be somewhat less efficient but didn't
> often generate code that did this, while the newer ones do, I think.
> 
> > Monitor is an old dec vrc16 and mouse is a 3 button ps2 noname.
> > 
> > but sometimes (thanks to the cranky ol' vrc16) it resets and the screen
> > turns into a half fishbowl in the top right hand corner of the screen
> > (Jay, are you sure those horiz & vert syncs were right?), which is, so
> > to speak, a pain in the arse. (it's the same with other monitors, but
> > they don't do fishbowl impersonations ;-)
> 
> Well, there were two versions of the VRC-16, with the newer one (often
> labelled "Low Emission Monitor") being slightly more capable at 1280x1024.
> The "fishbowl" effect is basically a factor of the few built-in "sync"
> points in the monitor electronics, ie 1024x768 @ 70Hz may be built-in and
> come up square, but the same resolution at 72Hz may not be and will come up
> "fishbowl".
> 
> Bottom line: the monitors are older technology and just not as capable as
> the newer ones.
> 
> Try using a Modeline with slight lower refresh rate, ie 70 instead of 72,
> which may be easier for the monitor to stay sync'ed with.
> 
> Good luck.
> 
> --Jay++
> 
> -----------------------------------------------------------------------------
>   American Non Sequitur Society: we don't make sense, but we do like pizza...
> 
> Jay A Estabrook                            Alpha Motherboards - LINUX Project
> Compaq Computer Corp.                      (508) 841-3241 or (DTN) 237-3241
> 334 South Street, Shrewsbury, MA 01545     Jay.Estabrook@digital.com
> -----------------------------------------------------------------------------
> 
> 
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