On Sun, May 23, 2010 at 11:56 AM, Dotan Cohen <[email protected]> wrote: > I have a Dell Inspiron 6400 / 1505E with 1680x1050 built-in LVDS and > external VGA connected to a 1680x1050 LCD monitor. The machine has an > ATI MobileRadeon x1400 graphics card, radeon driver. I can get the > external monitor to mirror the regular display, but I cannot put them > side-by-side with xrandr. > > ✈dcl:~$ xrandr --output LVDS1 --auto --preferred --output VGA1 --auto > --left-of LVDS1 > ✈dcl:~$ xrandr --fb 3360x1050 > xrandr: screen cannot be larger than 1680x1680 (desired size 3360x1050) > ✈dcl:~$ xrandr --fb 1680x2100 > xrandr: screen cannot be larger than 1680x1680 (desired size 1680x2100) > > The first command has absolutely no effect, that is why I try the > other two. Any ideas what to try next? Thanks! >
The ums (userspace modesetting) radeon driver cannot resize the front buffer after X has started. You need to either pre-allocate a larger front buffer using a Virtual directive in your xorg.conf, or enable kms (kernel modesetting). The kms-enabled radeon driver supports buffer resizing. Alex > -- > Dotan Cohen > > http://gibberish.co.il > http://what-is-what.com > _______________________________________________ > [email protected]: X.Org support > Archives: http://lists.freedesktop.org/archives/xorg > Info: http://lists.freedesktop.org/mailman/listinfo/xorg > Your subscription address: [email protected] _______________________________________________ [email protected]: X.Org support Archives: http://lists.freedesktop.org/archives/xorg Info: http://lists.freedesktop.org/mailman/listinfo/xorg Your subscription address: [email protected]
