Updated from 12.04 to 12.10: Screen Resolution dropped

[wilberfan]

Upgraded from 12.04 to 12.10 today, and my screen rez went from a correct 1440x900 down to 1152x864.

It's on an Intel iMac5,1.

I've been googling and trying things for about 3 hours but have yet to find a solution.

Here is the output of xrandr:

$ xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 800 x 600, current 1152 x 864, maximum 1152 x 864
default connected 1152x864+0+0 0mm x 0mm
   1152x864       60.0* 
   1024x768       61.0  
   800x600        61.0

Is there a way I can force it up to 1440x900?

Any help would be most appreciated!

[rencemc]

Go to System Settings->Display. You can set the resolution.

[wilberfan]

Tried that. The "1152x864" is the highest rez listed there...

(And because this is LXDE, it's under Preferences > Monitor Settings)

[rencemc]

I wonder if the graphics driver got changed. You can see if there are any listed in "Additional Drivers" and give it a try.

[wilberfan]

I wonder if the graphics driver got changed. You can see if there are any listed in "Additional Drivers" and give it a try.

Tried that, too. The only driver listed is one for wifi...

[wilberfan]

This iMac has an ATI, Radeon X1600 video card in it. Hmm. Wonder if nouveau is the best driver in this situation?

According to this page: https://help.ubuntu.com/community/Intel_iMac

For ATI graphics, you will need to install the proprietary graphics drivers. This can be done with the Driver Manger in System > Adminstration > Driver Manager. When installed correctly, reboot, and an additional check is to run
fglrxinfo
The output should tell you that the provider is ATI and not MESA.

When I ran that command, I got this:

$ fglrxinfo
X Error of failed request:  BadRequest (invalid request code or no such operation)
  Major opcode of failed request:  153 (GLX)
  Minor opcode of failed request:  19 (X_GLXQueryServerString)
  Serial number of failed request:  12
  Current serial number in output stream:  12

No idea what that means...

[wilberfan]

[SOLVED] (Sort of)

I should have known better than to upgrade rather than clean-install.

I've been playing with Ubuntu since Dapper Donkey (or whatever it was), and I have literally NEVER had an upgrade work out satisfactorily.

This afternoon I did a *clean* install of Lubuntu 12.10 and everything looks awesome. Full 1440x900 screen rez...