[lubuntu] Ubuntu 14.04: Caot enlarge screen resolution after Debian dist-upgrade

Hi,

I have two Linux installations on my machine:

a) Debian

b) Ubuntu Studio 14.04.4

Some weeks ago I executed a dist-upgrade in my Debian installation, from Debian 7 to Debian 8.

Before the Debian dist-upgrade I had as well as in installation a) and in installation b) each a screen resolution greater than 1024 x 768 pixels.

Having executed the Debian dist-upgrade I had a screen resolution of only 1024 x 768 pixels as well as in installation a) as in installation b).

I successfully could change (enlarge) the screen resolution in installation a) (Debian 8) by adding the following lines in the file /etc/default/grub in installation a):

I then executed update-grub in installation a) (Debian 8).

This resulted in a larger screen resolution in installation a). This is the result of xrandr in installation a):

So until here everything is fine.

Now the problem:

I have inserted the same lines, i.e

in the file /etc/default/grub in installation b) (Ubuntu Studio 14.04.4), then executed update-grub, but the screen resolution in installation b) (Ubuntu Studio 14.04.4) is still 1024 x 768 pixels, so the screen resolution did not get larger. And it is not possible to set a higher screen resolution via the desktop manager of Ubuntu Studio (here: XFCE). This is the result of the xrandr command in Ubuntu Studio 14.04.4: How can I enlarge the screen resolution in my Ubuntu Studio 14.04.4 installation?

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My graphics card is a Radeon HD 4350.

The following graphics card driver is installed in my Debian 8 installation:

xserver-xorg-video-radeon

The following graphics card driver is installed in my Ubuntu Studio 14.04.4 installation:

xserver-xorg-video-radeon

Regards,

nfidia