[ubuntu-uk] Screen resolution problems on dual-monitor setup

James Morrissey morrissey.james1 at gmail.com
Thu Aug 11 11:13:42 UTC 2011

So Colin's suggestion worked!

Once i logged in with Ubuntu classic desktop (no effects) i could set
the resolution i wanted (via monitor preferences) and everything
works. I am somewhat embarrassed that i didn't see that option when i
first tried this.

The only issue i am left with now is that screen size appears to be
taken from the larger 19" monitor. This means that the mouse can fall
off the top or bottom (or both) of the smaller monitor, depending on
where i position the smaller monitor in relation to the larger one
(again, in 'monitor preferences'). This isn't much of an issue however
as the GNOME menus bound the size to which applications maximise in
the smaller monitor. So i am happy to live with this.

One last thing then, since i had enough memory to run the resolutions
but the advanced effects were messing up the presentation, is it worth
filling a bug on this?

Thanks again, for all the help.


On 11 August 2011 11:52, Jim Price <d1version at hotmail.com> wrote:
> Hi James,
> On 11/08/11 10:14, James Morrissey wrote:
>> - Asus A6Rp; Asus A6 series entertainment notebook
> Rats - the ASUS page with the spec on it isn't working in Firefox or
> Chromium...
> It should be here:
> <http://support.asus.com/knowledge.aspx?SLanguage=en&p=3&s=41&m=A6Rp&os=&hashedid=aHR4WKHzgC0UPCGP>
> but the link doesn't work.
>> - I had a look in Bios but couldn't work out how to set any of this.
>> In the Bios the only seemingly relevant header was under 'Display' -->
>> Dsiplaye Settings --->  Video Devices. There the option was set to "LCD
>> + CRT", and the options were to set it to "LCD only" or "CRT only".
> Best leave that alone then.
>> Could you give me some idea of where i might look so that i can fiddle
>> with the memory settings?
> I would expect that if there is a setting for it, it would be labelled
> something like "Graphics UMA shared memory", but the BIOS is not bound to
> have that setting - it depends on how Asus designed the machine.
>> One more things, from google i managed to find the following, i am not
>> sure if it is of any use:
>> "lspci -v -s `lspci |grep VGA|awk {'print $1'}" into the terminal returns:
> Good stuff - I was going to suggest something similar.
>> 01:05.0 VGA compatible controller: ATI Technologies Inc RC410 [Radeon
>> Xpress 200M] (prog-if 00 [VGA controller])
>>        Subsystem: ASUSTeK Computer Inc. Device 1392
>>        Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 17
>>        Memory at c0000000 (32-bit, prefetchable) [size=256M]
>>        I/O ports at 9800 [size=256]
>>        Memory at fe1f0000 (32-bit, non-prefetchable) [size=64K]
>>        Expansion ROM at fe1c0000 [disabled] [size=128K]
>>        Capabilities:<access denied>
>>        Kernel driver in use: radeon
>>        Kernel modules: radeon, radeonfb
> OK, looks like it is using 256MB memory, so there is no problem with the
> amount of video memory for the resolutions you are trying to get.
>> Regarding Colin's suggestion:
>> This is the method I use to configure my laptop with an external
>> monitor (different graphics to the OP of course).  The fact that this
>> appears to be working initially, but with odd effects, suggests to me
>> that you have successfully configured the system to use both monitors
>> in the different resolutions and that the problems you are seeing are
>> due to something else.  I suspect that if you achieve the same results
>> by hand, so to speak, with one of the other methods, you may still run
>> into the strange after effects.   Have you tried running the Classic
>> interface instead of Unity?  Also try switching off special effects.
>> This may throw light on the cause of the problem.
>> - The problem persists even in the classic desktop. That said, what
>> would be the settings, in Natty, for no desktop effects?
> It should be possible to select something like "GNOME desktop - no effects"
> as you login. Once you've selected your login name, check the bottom of the
> scree for a dropdown box which allows you to select that option (or
> similar). I've seen the borderless windows effect on several ATI graphics
> cards when desktop effects are enabled, and turning them off like that frees
> up graphics resources and usually makes things work properly.
>> I ask as that
>> option has been removed from the 'Appearance' application. All the
>> desktop effects are now set through CCSM now, i think. As such what
>> would be the CCSM settings for no advanced effects?
>> Thanks for all the advice,
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