Help. x1600, dual monitors, DVI twitching
alexdeucher at gmail.com
Wed Aug 5 13:10:15 PDT 2009
On Wed, Aug 5, 2009 at 3:24 PM, Ron King<rking at mro.nmt.edu> wrote:
> I'm on Fedora 11, M56 x1600, X server 1.6.2-3, ATI driver 6.12.2-14.
> Laptop with docking station and dual Samsung SyncMaster 940Be LCDs.
> Docking station has one VGA and one DVI-D. All works fine in XP, Fedora
> 8 (using Xrandr 1.2, I believe).
> LVDS and VGA work fine, alone or dual. DVI produces a vertical twitch,
> always. Running the cursor up the screen shows missing horizontal
> lines. Modes appear to be correct and match published monitor modes.
> Changing modelines with xorg.conf and Xrandr do not seem to have any
> effects. Adding modes in Xrandr and using them causes the monitor to
> blank, then return and still report the same problem. Monitor reports
> 31.7kHz and 30Hz regardless of changes. Is this mode hard coded for
> DVI-D somewhere?
It sounds like your monitor doesn't like dvi coherent mode. try:
xrandr --output DVI-0 --set coherent_mode 0
xrandr --output DVI-0 --off
xrandr --output DVI-0 --auto
If that doesn't work, you might try the driver from xf86-video-ati git
master. The display issues may be due to underflow to the display
More information about the xorg