need some help ...

Alex Deucher alexdeucher at
Tue Jan 9 17:18:22 UTC 2018

On Mon, Jan 8, 2018 at 7:58 PM, Hans Schneidhofer <hans_linuser at> wrote:
> hi list,
> have installed a new Ubuntu 16.04 lts with kernel 4.10.
> My Hardware :
> Mainboard : M5A78L-M PLUS/USB3
> CPU : AMD Phenom(tm) II X2 511 Processor
> RAM : DDR3 8 GB
> Graphic : RS780L [Radeon 3000]
> Display : LG 32LH301C (32")
> Now - my problem is, I had to change my old mainboard to the above new
> one. And there was an nvidia graphic-chip on the mainboard.
> I didn't reinstall the system but started the PC with the new
> Mainboard. Ubuntu installs automatically the new ATI-driver.
> Now, with the new ATI-3000 Graphicchip I have some trouble with the
> size of displaying the correct size. The screen is first too big or so
> called oversized. With the option "xrandr --output HDMI-0 --set
> underscan on I get a screen near the right size, but still I get a size
> 1 cm lower in both x- and y-axis AND I have to change the resolution of
> 1920 x 1080 by hand.
> Could anyone give me some light on how to reorganize the resolution and
> the size of the screen ?
> It seems, that xorg.conf has changed to a newer file-model and I can
> not handle the new structure.
> So - where do I have to make which entries ?
> Hope, anyone could give some hints ?

Take a look at your TV's setting and try and find the one that turns
off overscan.  Otherwise, you'll just end up with the content being
scaled twice, once by the TV and again by the GPU.  As for the mode
selection, please attach your xorg log and dmesg output.


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