Arch Linux

rpkita

Member

Registered: 2009-11-02

Posts: 16

[Solved] Help - X won't go full screen on LCD screen

Hi

I installed Arch (with IceWM) on COMPAQ Presario 3550 that came with LCD monitor FP725D (this is a 9 years old unit).  It has 2 video ports, HD-15 and DFP.

When I installed Arch, I used HD-15 port, connected it to my 15" CRT monitor.
Everything works fine, looks great, full screen.

After I'm done, I hooked up the LCD monitor (on DFP connector).  At first X failed to start, then I modified xorg.conf manually by adding these:

- under "Monitor" section:
DisplaySize     269  201
HorizSync       28-64
VertRefresh    60

- under "Screen" section:
  DefaultDepth   16
  SubSection     "Display"
        Depth       16
        Modes      "1024x768"
    EndSubSection

(Depth 16 is the max it can support, because I tried 24 earlier and X failed to start).

Now X starts fine, but it won't go full screen on this LCD monitor.

The monitor native res is 1024 x 768 @ 60 according to the spec over here:
http://www.elhvb.com/mobokive/Archive/C … specs.html

I tried to run "hwd -xa" and also "Xorg -configure", both produced unusable xorg.conf (X failed to start). So, I went back to the old xorg.conf with my mods.

When I tried to run "xrandr -q", it told me that the min=640x480, max = 800x600, and current=800x600.

My understanding is, this old LCD monitor doesn't support scaling (only do 1:1 pixel mapping), and also I suspected the video card doesn't outputting full resolution.

This monitor doesn't have any adjustment buttons. It has only 3 buttons: on/off switch, "+", and "-".
The "+" and "-" I suspect is for the brightness adjustment.

So, what should I do to be able to get full screen on this monitor?

I really appreciate any help.

Thanks

Last edited by rpkita (2009-11-06 18:29:56)

Knute

Member

From: Minot, ND

Registered: 2009-03-17

Posts: 604

Re: [Solved] Help - X won't go full screen on LCD screen

What happens if you take out the display size option?

Alternately, you can put in the correct mm's for the dimensions, as what was listed in the quick specs are in inches, which means that you need to convert them to milimeters.  And what you have doesn't seem to match.

---

Knute

rpkita

Member

Registered: 2009-11-02

Posts: 16

Re: [Solved] Help - X won't go full screen on LCD screen

Hi Knute,

Nothing happened when I took out the DisplaySize option.

I "accidentally" found the fix by the way. I played around with the "Depth", set it to 8, and I got full screen.
I tried all numbers from 9 to 15, only 8 worked.

I guess the video card is capable of 16 bit, but the LCD monitor is not. I doubt the DFP connector has anything to do with it, it should be as good as HD-15.

If I hooked up a CRT on the HD-15, I got 16 bit, 1024x768 @60.

Anyway, I'm glad it worked now, even though I don't get 16 bit.

Thank you