T420 Dual Display Temp Switch to Single Display then Back

T420, no docking station, with external monitor connected to VGA port. Windows 8.1 64-bit. Display driver up-to-date, Windows 8.1 up-to-date. Lenovo Syetm Update run and everything is up-to-date. So occasionally it switches back to single display (laptop screen) then immediately switches back to dual display. Seems to do this randonly without warning. I don't see any obvious issues, event log does not show any problems when the issue occurs. I did reinstall the display driver but that did not help. This is more of an annoyance then anything else. I just stop what I am doing and wait for it to switch back to dual display, as I use the external monitor as my primary desktop.

Same problem here. Brand new 2011 MacBookPro 17" and the 27" Cinema Display with the display port. The display goes black for about .5 secs, then comes back on. It is sporadic but happens multiple (30) times per hour.
The display worked fine with my old MBP 2010 with display port, so obviously this is a Thunderbolt issue.
Firmware update please?!

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[http://www.kvms.com/Landing/Dual-Video-Central.aspx|http://www.kvms.com/Landin g/Dual-Video-Central.aspx]
[http://www.kvm-switches-online.com/dual-head-kvm-switch.html|http://www.kvm-sw itches-online.com/dual-head-kvm-switch.html]
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Highest dual display resolution for mac mini mid 2011

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Display Support:
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Details:
*This model simultaneously supports 1920x1200 on an HDMI display or a DVI display using the included HDMI-to-DVI adapterand 2560x1600 on a Thunderbolt or Mini DisplayPort display or even a VGA display (with an optional Mini DisplayPort-to-VGA adapter, which is compatible with the Thunderbolt port).
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According to the copy&paste from wikipedia, HDMI should support higher resolution than 1920x1200. So the question is, does it aupport that on the mid 2011 mac mini. It says in the specifications
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HDMI version
1.0
1.1
1.2
1.3
1.4
2.0
Date initially released
December 9, 2002
May 20, 2004
August 8, 2005
June 22, 2006
May 28, 2009
September 12, 2013
Maximum clock rate (MHz)
165
165
165
340
340[109]
600
Maximum TMDS throughput per channel (Gbit/s) including 8b/10b overhead
1.65
1.65
1.65
3.40
3.40
6
Maximum total TMDS throughput (Gbit/s) including 8b/10b overhead
4.95
4.95
4.95
10.2
10.2
18
Maximum throughput (Gbit/s) with 8b/10b overhead removed
3.96
3.96
3.96
8.16
8.16
14.4
Maximum audio throughput (Mbit/s)
36.86
36.86
36.86
36.86
36.86
Maximum color depth (bit/px)
24
24
24
48[a]
48
Maximum resolution over single link at 24-bit/px[b]
1920×1200p60
1920×1200p60
1920×1200p60
2560×1600p75
4096×2160p24
4096×2160p60
Maximum resolution over single link at 30-bit/px[c]
N/A
N/A
N/A
2560×1600p60
4096×2160p24
Maximum resolution over single link at 36-bit/px[d]
N/A
N/A
N/A
1920×1200p75
4096×2160p24
Maximum resolution over single link at 48-bit/px[e]
N/A
N/A
N/A
1920×1200p60
1920×1200p60
Maximum 3D resolution (using a full resolution 3D format) over single link at 24-bit/px
N/A
N/A
N/A
N/A
1920×1200p60

Dual display color and other related issues...

I have posted this on painter forums, though some of the issues coming together here are directly related to issues w/ Snow Leopard and dual displays. Thought I would try here....
This is so bizarre. When I ever I run P11(I think this is going on in P10 too?) w/ the OS X (snow leopard, 10.6.2 on quad core Intel Xeon Mac Pro, 10 GB of RAM) menu bar on my Eizo(making it the main display), and the Apple Cinema display left as the #2 monitor, I get very annoying brush cursor artifcats left randomly on the Eizo screen after strokes. One cannot predict when the cursor will leave it's gray "marks", but it will do it, sometimes 5 strokes in a row, sometimes after 15 strokes or so? If I move my brush back over them, or change the image percantage view, they vanish, obviously new ones coming back, as I work.
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The reason I am doing this is Snow Leopard has bad color issues w/ dual displays (well documented, much to Photoshop CS4 users frustrations, and mine). Apple needs to fix it... but for me to see the right color on the Eizo(this is my main color and superior display), it needs to be the main monitor(menu bar) in 10.6.2.
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Thanks!, T

I have posted this on painter forums, though some of the issues coming together here are directly related to issues w/ Snow Leopard and dual displays. Thought I would try here....
This is so bizarre. When I ever I run P11(I think this is going on in P10 too?) w/ the OS X (snow leopard, 10.6.2 on quad core Intel Xeon Mac Pro, 10 GB of RAM) menu bar on my Eizo(making it the main display), and the Apple Cinema display left as the #2 monitor, I get very annoying brush cursor artifcats left randomly on the Eizo screen after strokes. One cannot predict when the cursor will leave it's gray "marks", but it will do it, sometimes 5 strokes in a row, sometimes after 15 strokes or so? If I move my brush back over them, or change the image percantage view, they vanish, obviously new ones coming back, as I work.
However I put the OS menu bar on the AC display, yet work back on the Eizo, this does NOT happen. No cursor artifacts. Well, at least I can summon the issue
The reason I am doing this is Snow Leopard has bad color issues w/ dual displays (well documented, much to Photoshop CS4 users frustrations, and mine). Apple needs to fix it... but for me to see the right color on the Eizo(this is my main color and superior display), it needs to be the main monitor(menu bar) in 10.6.2.
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Solved!
Go to Solution.

I know it's an old discussion, but I wanted to post instructions on getting the dual-monitor setup working, as it took me a while to get it right.  This is using a Lenovo x301 with Windows XP SP3,
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Message Edited by BMCit on 01-28-2009 01:56 PM

T420 Dual Display Temp Switch to Single Display then Back

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