[Bug 28540] New: Radeon X300 analog VGA is broken

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Mon Jun 14 13:30:33 PDT 2010


           Summary: Radeon X300 analog VGA is broken
           Product: xorg
           Version: unspecified
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: blocker
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: freedesktopbugzilla at lambermont.dyndns.org
         QAContact: xorg-team at lists.x.org

Thinkpad Z60m with ATI Technologies Inc M22 [Mobility Radeon X300] rev 0 ,
Ubuntu 10.04 , stock /usr/lib/xorg/modules/drivers/radeon_drv.so compiled for
1.7.6, module version = 6.13.0

Analog VGA connected to a Philips Brilliance 220C (wants 1680x1050 at 60Hz) or a
Samsung 2443BW (wants 1920x1200 at 60Hz) is not usable.
This limits the driver to the LVDS laptop screen.

My goal is to disable LVDS and only use VGA-0.

No xorg.conf used, from the Xorg.0.log : 
(II) RADEON(0): Printing DDC gathered Modelines:
(II) RADEON(0): Modeline "1680x1050"x0.0  146.25  1680 1784 1960 2240 1050 1053
1059 1089 +hsync +vsync (65.3 kHz)
(II) RADEON(0): Not using mode "1680x1050" (bad mode

The "1680x1050"x0.0 looks suspicious to me. 0 Hz ? Is this the monitor's EDID
at fault ?

(II) RADEON(0): Printing probed modes for output VGA-0
(II) RADEON(0): Modeline "1680x1050"x60.0  146.25  1680 1784 1960 2240 1050
1053 1059 1089 +hsync +vsync (65.3 kHz)

Looks promising.

(II) RADEON(0): Output VGA-0 using initial mode 1680x1050
(II) RADEON(0): Output DVI-0 using initial mode 1360x768
(II) RADEON(0): Output LVDS using initial mode 1280x800

The VGA-0 and LVDS lines look perfect. Just nothing is shown on the VGA-0 port,
the screen stays blank.
The DVI-0 line is just weird; this laptop does not have a DVI port.

I tried both gnome and kde monitor configuration to no success.

After lots of hacking in a hand-written xorg.conf file (I succesfully edited
NVidia configs before) I managed to get something shown on the VGA-0 port, it
was however in the 1360x768 resolution of the non-existent DVI-0 port ! This at
least shows that the VGA-0 port is working to some level.

-- Hans

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