Le mercredi 11 juin 2008, Adam Williamson a écrit :
> On Tue, 2008-06-10 at 22:40 -0700, Adam Williamson wrote:
> > On Tue, 2008-06-10 at 12:01 +0100, Colin Guthrie wrote:
> > > Chances are your monitor is not giving the EDID info correctly - tho'
> > > if you have tried several displays this is unlikely. I have a similar
> > > chip myself and it works fine :/
> > >
> > > Perhaps your xorg.conf does something odd with disabling EDID or
> > > something?
> >
> > I saw someone reporting a similar issue on the forums recently. I got
> > their xorg.conf and Xorg.0.log and could not see what the problem was;
> > no unusual settings in xorg.conf , and from the log, the monitor was
> > providing correct modelines via DDC. I *think* it's some kind of driver
> > bug.
>
> Actually, a development from the forum: it turns out that my
> more-in-hope-than-expectation suggestion actually helped. Try commenting
> out the HorizSync and VRefresh lines in xorg.conf . Does that help?
>
> Forum thread is http://forum.mandriva.com/viewtopic.php?p=503032 , btw.

Yes this looks like my problem; i tried commenting the modelines but still no
way to to set a resolution above 640x480 for the external display; even
manually with xrandr.
This is with 2008.1; will try in afew minutes with cooker and report here if
behaviour is different.
Here is the output of:

xrandr --verbose --prop
Screen 0: minimum 320 x 200, current 1280 x 800, maximum 1280 x 1280
VGA connected 640x480+0+0 (0x7b) normal (normal left inverted right x axis y
axis) 338mm x 270mm
    Identifier: 0x4b
    Timestamp: 1654044
    Subpixel:  unknown
    Clones:
    CRTC:     0
    CRTCs:    0 1
    EDID_DATA:
          00ffffffffffff0015c3361801010101
          3310010368221b78eaaea5a6544c9926
          145054bfef8081808140814f714f0101
          010101010101302a009851002a403070
          1300520e1100001e000000ff00363734
          39323132360a20202020000000fd0032
          4b18500e000a202020202020000000fc
          0053313730310a20202020202020001d
640x480 (0x7b)  25.2MHz -HSync -VSync
    h: width  640 start 656 end 752 total 800 skew   0 clock  
31.5KHz
    v: height 480 start 490 end 492 total 525       clock  60.0Hz
LVDS connected 1280x800+0+0 (0x4e) normal (normal left inverted right x axis y
axis) 0mm x 0mm
    Identifier: 0x4c
    Timestamp: 1654044
    Subpixel:  horizontal rgb
    Clones:
    CRTC:     1
    CRTCs:    1
    PANEL_FITTING: full
          supported: center     full_aspect full
    BACKLIGHT_CONTROL: native
          supported: native     legacy     combination kernel
    BACKLIGHT: 0 (0x00000000) range: (0,0)
1280x800 (0x4e)  68.9MHz
    h: width 1280 start 1292 end 1340 total 1440 skew   0 clock  
47.8KHz
    v: height 800 start 804 end 807 total 823       clock  58.1Hz
----------- cut all the other modes ---------------------
TV disconnected (normal left inverted right x axis y axis)
    Identifier: 0x4d
    Timestamp: 1654044
    Subpixel:  unknown
    Clones:
    CRTCs:    0 1
    BOTTOM: 37 (0x00000025) range: (0,100)
    RIGHT: 46 (0x0000002e) range: (0,100)
    TOP: 36 (0x00000024) range: (0,100)
    LEFT: 54 (0x00000036) range: (0,100)
    TV_FORMAT: NTSC-M
          supported: NTSC-M     NTSC-443   NTSC-J     PAL-M
                 PAL-N     PAL

Will follow the topic on the forum; thanks Adam.
JPB