Active area shorter than physical screen

Alex Deucher alexdeucher at
Thu Nov 25 08:33:19 PST 2010

On Thu, Nov 25, 2010 at 12:02 AM, Ross Boylan <ross at> wrote:
> There are noticeable black/unilluminated bands at the top and bottom
> of my physical screen.  Is this expected?  Is there anything I can do
> about it?
> video: ATI Technologies Inc RV570 [Radeon X1950 Pro] rev 0, Mem
>       @ 0xd0000000/28, 0xf0300000/16, I/O @ 0x2000/8
> xorg 6.9.0 (xserver-xorg-video-ati 1:6.9.0-1+lenny4).  Debian has
> incorporated some fixes from recent git into this driver (details in
> changelog.Debian).

You might want to try a newer version of the driver 6.9.0 is several years old.


> Monitor: Samsung 245T (1920x1200)  It has no controls that permit
> adjustment to the vertical size.
> Xeon 64 bit chips
> OS: Debian stable, with some later versions pulled in.  The kernel is
> from more current releases and is linux-image-2.6.32-5-amd64.
> I noticed them first after I rebooted and the screen started to
> flicker (strobe might be a better term; it looked like a CRT with the
> refresh rate too low).  I sent the monitor in for servicing; the
> flickering is gone but the shrinkage remains.  It's possible it's been
> there for awhile and I didn't notice it.  There have been some
> upgrades to the kernel and other software, including X; likely some
> would have taken effect only on reboot.
> I also have the radeonhd driver on the system; I do not think I am
> using it.
> I have the same model of monitor on another system with an nvidia
> card/proprietary driver, and the image fills the full screen.  Even
> there, the on-screen display of the monitor provides no adjustments to
> the dimensions.
> I've attached my config file and some logs.
> Happy Thanksgiving to those in the US!
> Ross Boylan
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