[ltp] T520 Ubuntu 11.10 x64 - can't connect external monitor
Fen Labalme
linux-thinkpad@linux-thinkpad.org
Sun, 5 Feb 2012 12:47:42 -0500
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Hi Marius -
Thanks for your reply. I think I'm getting closer...
2012/2/4 Marius Gedminas <marius@gedmin.as>
>
> > Will the VGA be able to drive a 1920x1200 display?
>
> Why not? My Asus EeePC 900 (ancient Intel 945) drives a 1920x1080p TV
> over VGA with sufficient 3D for all those Compiz effects.
>
I dropped back to running with BIOS set to Intel Integrated Graphics and
was able to get a 3200x1200 virtual display with the external monitor
attached via a VGA cable (and hotplug basically works):
1600x900 (T520) + 1600x1200 (Samsung) = 3,840,000 pixels total
This is lower than the native (1920x1200) resolution on Samsung (and looks
horrible). What I want is a 3520x1200 virtual display:
1600x900 (T520) + 1920x1200 (Samsung) = 4,224,000 pixels total
This is upsetting as the maximum resolution available from the Intel GPU is
2560x1600 = 4,096,000 pixels [URL1]
And the Nvidia may not help either where the maximum resolution is reported
to be:
2048x1536 = 3,145,728 pixels (VGA)
2560x1600 = 4,096,000 pixels (DisplayPort)
Question 1: Am I thinking about this right? Do those numbers confirm that
I can't get a virtual screen the size I want using only one or the other
GPU? There's at least one clue that this is not the case from xrandr:
> xrandr -q
Screen 0: minimum 320 x 200, current 3200 x 1200, maximum 8192 x 8192
(BTW: I had to remove the xorg.conf during the switch from Discrete to
Integrated graphics, and even after fooling with the setup a while, no new
xorg.conf file was created.)
System specs:
T520 with i7-2760QM running Ubuntu 11.10
Intel HD 3000 Integrated GPU
Nvidia NVS 4200M w/ Optimus and 1GB DDR3 Memory
Thinkpad monitor has 1600x1200 display (HD+)
Samsung monitor has 1920x1200 display
Notes:
URL1:
http://software.intel.com/en-us/articles/quick-reference-guide-to-intel-processor-graphics/
URL2: http://www.nvidia.com/object/nvs_techspecs.html
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Hi Marius -<div><br></div><div>Thanks for your reply. =A0I think I'm ge=
tting closer...<br><br><div class=3D"gmail_quote">2012/2/4 Marius Gedminas =
<span dir=3D"ltr"><<a href=3D"mailto:marius@gedmin.as">marius@gedmin.as<=
/a>></span><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;=
border-left:1px #ccc solid;padding-left:1ex">
<div class=3D"im">
> Will the VGA be able to drive a=A01920x1200 display?<br>
<br>
</div>Why not? =A0My Asus EeePC 900 (ancient Intel 945) drives a 1920x1080p=
TV<br>
over VGA with sufficient 3D for all those Compiz effects.<br></blockquote><=
div><br></div><div>I dropped back to running with BIOS set to Intel Integra=
ted Graphics and was able to get a 3200x1200 virtual display with the exter=
nal monitor attached via a VGA cable (and hotplug basically works):</div>
<div>1600x900 (T520) + 1600x1200 (Samsung) =3D 3,840,000 pixels total</div>=
<div><br></div><div>This is lower than the native (1920x1200) resolution on=
Samsung (and looks horrible). =A0What I want is a 3520x1200 virtual displa=
y:</div>
<div>1600x900 (T520) + 1920x1200 (Samsung) =3D 4,224,000 pixels total</div>=
<div><br></div><div>This is upsetting as the maximum resolution available f=
rom the Intel GPU is</div><div>2560x1600 =3D 4,096,000 pixels [URL1]</div><=
div>
<br></div><div>And the Nvidia may not help either where the maximum resolut=
ion is reported to be:</div><div>2048x1536 =3D 3,145,728 pixels (VGA)</div>=
<div>2560x1600 =3D 4,096,000 pixels (DisplayPort)</div><div><br></div><div>
Question 1: Am I thinking about this right? =A0Do those numbers confirm tha=
t I can't get a virtual screen the size I want using only one or the ot=
her GPU? =A0There's at least one clue that this is not the case from xr=
andr:</div>
<div><br></div><div>> xrandr -q</div><div>Screen 0: minimum 320 x 200, c=
urrent 3200 x 1200, maximum 8192 x 8192</div><div><br></div><div>(BTW: I ha=
d to remove the xorg.conf during the switch from Discrete to Integrated gra=
phics, and even after fooling with the setup a while, no new xorg.conf file=
was created.)</div>
<div><br></div><div><div>System specs:</div><div>T520 with i7-2760QM runnin=
g Ubuntu 11.10</div><div>=A0 =A0Intel HD 3000 Integrated GPU</div><div>=A0 =
=A0Nvidia NVS 4200M w/ Optimus and 1GB DDR3 Memory</div><div>Thinkpad monit=
or has 1600x1200 display (HD+)</div>
<div>Samsung monitor has 1920x1200 display</div><div><br></div><div>Notes:<=
/div><div>URL1: <a href=3D"http://software.intel.com/en-us/articles/quick-r=
eference-guide-to-intel-processor-graphics/">http://software.intel.com/en-u=
s/articles/quick-reference-guide-to-intel-processor-graphics/</a></div>
<div>URL2: <a href=3D"http://www.nvidia.com/object/nvs_techspecs.html">http=
://www.nvidia.com/object/nvs_techspecs.html</a></div></div></div>
</div>
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