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taylordtv
PostPosted: Sun May 28, 2006 7:21 am 
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Joined: Fri May 05, 2006 10:29 pm
Posts: 8
Location: Australia
G'day all,
I have an LCD panel that I just can't seem to get 1280x768 working via VGA from an EPIA SP13000 with knoppmyth. I have previously had this resolution working from the same board running XP, so I know the panel is good.
I generated a suggested modeline(s) from xtiming.pl but I kept getting either (vertical sync too wide) or (horixontal sync too wide) errors. I have used the settings that are reported from the /var/log/XFree86.0.log (via DDC probe I guess) over those that were calculated via xtiming.pl to see if that would fix things - to no avail.

Here is the relevant part of the log...

Code:
(II) VIA(0): Supported additional Video Mode:
(II) VIA(0): clock: 80.1 MHz   Image Size:  862 x 517 mm
(II) VIA(0): h_active: 1280  h_sync: 1344  h_sync_end 1480 h_blank_end 1680 h_border: 0
(II) VIA(0): v_active: 768  v_sync: 769  v_sync_end 788 v_blanking: 795 v_border: 0
(II) VIA(0): Ranges: V min: 56  V max: 85 Hz, H min: 30  H max: 80 kHz, PixClock max 80 MHz
(II) VIA(0): Monitor name: DT-3003X
..
(II) VIA(0): Not using mode "1280x768" (vertical sync too wide)


The relevant parts of XF86Config-4 with the settings gleaned from the log.

Code:
Section "Monitor"
        Identifier      "Monitor0"
        Option  "DPMS"  "true"
        # These are the AWA panels limits
        HorizSync    30   - 80 # from X logs DDC probe
        VertRefresh  56   - 85 # from X logs DDC probe
        # From http://xtiming.sourceforge.net/cgi-bin/xtiming.pl
        Modeline "1280x768" 80.13 1280 1344 1480 1680 768 769 788 795 +hsync +vsync
        # From reading logs and http://www.linux-mag.com/content/view/1672/0/1/2/
#       Mode "1280x1024"
#               DotClock 80.130
#               HTimings 1280 1344 1480 1680
#               VTimings  768  769  788  795
#       EndMode
EndSection

        SubSection "Display"
                Depth     16
                Modes "1280x768" "1024x768" "800x600" "640x480"
        EndSubSection


Interestingly, ddcxinfo-knoppix doesn't report 1280x768 as a valid mode, even thought the panel definitely supports it.
Using ddcprobe give numbers that might correlate with the log timings - if I knew how to interpret them
From ddcprobe...

Code:
Detailed timing 1:
        Pixel clock: 80130000
        Horizontal active time (pixel width): 256
        Horizontal blank time (pixel width): 1424
        Vertical active time (pixel height): 0
        Vertical blank time (pixel height): 795
        Horizontal sync offset: 320
        Horizontal sync pulse width: 136
        Vertical sync offset: 3
        Vertical sync pulse width: 1
        Dimensions: 606x773


Can anyone shed any light on what is causing the "vertical sync too wide" errors? I suspect it's something simple, but I really can't put my finger on it.

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mjl
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PostPosted: Sun May 28, 2006 7:49 am 
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Joined: Sun Jun 12, 2005 10:55 pm
Posts: 3161
Location: Warwick, RI
Hi
Try setting the vert refresh to 60, I have an "economical" lcd and that is the only way it will work. The image pops in once the xserver starts.
VertRefresh 60 # from X logs DDC probe
Mike
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taylordtv
 Post subject:
PostPosted: Sun May 28, 2006 8:51 pm 
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Joined: Fri May 05, 2006 10:29 pm
Posts: 8
Location: Australia
mjl wrote:
Hi
Try setting the vert refresh to 60, I have an "economical" lcd and that is the only way it will work. The image pops in once the xserver starts.
VertRefresh 60 # from X logs DDC probe
Mike


Ta for the tip, but no dice - still got the same error.
However, as usually happens to me once I finally ask a question, a brainwave occurs. I had look for the source of the error in the driver code (/usr/src/openchrome/unichrome/via_mode.c), and lo, this pops out.

Code:
  /* vertical sync end : start + 16 -- other bits someplace? */
    DEBUG(xf86DrvMsg(pScrn->scrnIndex, X_INFO, "CrtcVSyncEnd: 0x%03X\n",
                     mode->CrtcVSyncEnd));
    ViaCrtcMask(hwp, 0x11, mode->CrtcVSyncEnd, 0x0F);

...

    if ((mode->CrtcVSyncEnd - mode->CrtcVSyncStart) > 16) {
        xf86DrvMsg(pScrn->scrnIndex, X_INFO, "CrtcVSyncEnd out of range.\n");
        return MODE_VSYNC_WIDE;
    }


So I made sure that my Vsync_end value in my modeline was not more that 16 greater than the start (changed 788 to 785) and viola, it works. The 'solution' smells of a bit of a hack, but it works which is good enough for me.

There is another section (ViaModeSecondaryVGAValid) in via_modes.c that allows Vsync > 16, but that doesn't seem to get called (only one display is active?), so my modeline hack is required.

Now on to my sound issues.

M

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nigelpearson
 Post subject:
PostPosted: Mon May 29, 2006 5:57 am 
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Joined: Wed Mar 03, 2004 7:43 pm
Posts: 748
Location: Sydney, Australia
This may not help, but these are the modelines that I use on a different VIA powered motherboard:
Code:
105c104,105
<       VertRefresh  50.0 - 75.0 # Very conservative. May flicker.
---
>       VertRefresh  50.0 - 100.0 # Added by Nigel
> #     VertRefresh  50.0 - 75.0 # Very conservative. May flicker.
106a107,121
>       # 1280x720 @ 50.00 Hz (GTF) hsync: 37.05 kHz; pclk: 60.47 MHz
>       Modeline "1280x720"  60.47  1280 1328 1456 1632  720 721 724 741  -HSync +Vsync
>       # 1280x720 @ 75.00 Hz (GTF) hsync: 56.40 kHz; pclk: 95.65 MHz
>       Modeline "1280x720"  95.65  1280 1352 1488 1696  720 721 724 752  -HSync +Vsync
>       # 1280x720 @ 60.00 Hz (GTF) hsync: 44.76 kHz; pclk: 74.48 MHz
>       Modeline "1280x720"  74.48  1280 1336 1472 1664  720 721 724 746  -HSync +Vsync
>       # 1280x768 @ 50.00 Hz (GTF) hsync: 39.55 kHz; pclk: 65.18 MHz
>       Modeline "1280x768"  65.18  1280 1336 1464 1648  768 769 772 791  -HSync +Vsync
>       # 1280x768 @ 75.00 Hz (GTF) hsync: 60.15 kHz; pclk: 102.98 MHz
>       Modeline "1280x768"  102.98  1280 1360 1496 1712  768 769 772 802  -HSync +Vsync
>       # 1280x768 @ 60.00 Hz (GTF) hsync: 47.70 kHz; pclk: 80.14 MHz
>       Modeline "1280x768"  80.14  1280 1344 1480 1680  768 769 772 795  -HSync +Vsync
>
>
>


The 720p modes aren't supported by the VIA drivers, but one of those 768p ones is.

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| "Things you own end up owning you" - Tyler, Fight Club
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