[CLUE-Tech] X resolution

[Ed Hill]

On Fri, 2003-05-30 at 11:37, Matt Gushee wrote:
> Hello, folks--
> 
> I am having an XFree86 resolution. My monitor and video card should be
> able to run at 1280x1024 (and can under Windows), but the highest res I
> can get under X is 1152x864. I've googled but can't find anything that
> is clearly relevant, so I thought I'd give the old CLUE gang a try.
> 
> Here's what I've got:
> 
>   Video card:  Matrox Millennium G450*, 4MB RAM
>   Monitor:     ViewSonic ViewPanel VE170 (LCD)
>   XFree86:     4.1.0**
> 
>   * Or it might be a G400. If it matters, I can open up the machine and
>     find out for sure.
>   ** Yes, I know that's a bit old. It's what comes with Debian.
>     According to the docs it supports this video card, with no
>     qualifications that I know of.
> 
> According to my calculations, 1280x1024 @ 24 bpp *should* work:
> 
>   Available:  4MB * 1024^2 = 4194304 bits
>   Required:   1280 * 1024 * 3 = 3932160 bits [1 byte/pixel * 3 = 24bpp]
> 
> Well, maybe XFree needs to reserve more than 262144 bits for something
> or other. Even so, there's no question that there should be enough VRAM
> at 16bpp; but I've tried that too, and it makes no difference: I can get
> 1152x864 and no more. I have checked the HorizontalSync and VertRefresh
> settings in my XF86Config, and they match the published specs for the
> monitor.
> 
> If it were just the screen real estate, it's not that big a difference;
> I could live with the lower res. But since it's an LCD monitor and its
> physical resolution is 1280x1024, it looks a whole lot better at
> 1280x1024, so I'd really like to fix this if I can.
> 
> Any suggestions?


Hi Matt,

Have you tried editing the "Monitor" and "Screen" sections of your
XF86Config (usually at "/etc/X11/XF86Config") file?

Within the "Monitor" section you can specify the horizontal and vertical
refresh limits which then places limits on the maximum resolution.  Your
monitor (if its a "VE170m") can support Fh :30-82kHz; Fv :50-75Hz as
specified at:

  http://www.viewsonic.com/products/lcd_ve170m.htm#specs


And then in the "Screen" section you can specify the allowable
resolutions such as:

Section "Screen"
        Identifier "Screen0"
        Device     "Videocard0"
        Monitor    "Monitor0"
        DefaultDepth     16
        SubSection "Display"
                Depth     16
                Modes    "1600x1200" "1400x1050" "1280x1024" "1280x960"
"1024x768" "800x60
0" "640x480"
        EndSubSection
EndSection


hth,
Ed

-- 
Edward H. Hill III, PhD 
Post-Doctoral Researcher
Division of ESE, Colorado School of Mines, Golden, CO 80401
Email: ed at eh3.com  ehill at mines.edu
Phone: 303-273-3483
URLs:  http://cesep.mines.edu/people/hill.htm  http://eh3.com
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 189 bytes
Desc: This is a digitally signed message part
Url : http://cluedenver.org/pipermail/clue-tech/attachments/20030530/5ed47778/attachment.bin