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On Sun, Jan 22, 2012 at 10:54 AM, Mark Knecht <markknecht@×××××.com> wrote: |
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> I've seen reports for years about folks having problems with some KVMs |
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> under Linux. I've never personally had one myself. However I've been |
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> helping a Windows friend break his Redmond addiction over the last few |
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> months using Gentoo. He has a nice 3 monitor KDE-based system that's |
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> been working fine but there was one monitor that refused to set up |
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> with the right resolution. We left it alone for a long time as it was |
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> usable but finally yesterday got together to figure out what was |
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> happening. From the title it should be clear that the problem was a |
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> KVM hooked to that one monitor. Removing the KVM completely solved the |
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> problem. |
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> |
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> Now, what I'm wondering is why this same video card/KVM/monitor |
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> combination which apparently worked in Windows should have any |
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> problems in Linux? Anyone know why? |
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> |
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> In the spirit of full discloser I don't really know that this |
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> _specific_ video card was tested in Windows, but he owns multiple |
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> NVidia 8400GS cards and it's my understanding that other 8400GS cards |
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> did work with this KVM & monitor, so unless it's this specific card |
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> having a defect, or even being just a bit weak in some way, it would |
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> seem to be the insertion of the KVM itself that upset things. |
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> |
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> Looking at the monitor's specs/requirements for running the higher |
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> resolutions it uses, as should not be a surprise, higher frequencies |
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> to do higher resolutions. If the KVM was filtering those a bit then |
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> it's possible things wouldn't work, but that doesn't explain why it |
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> did work in Windows. |
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> |
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> Basically, I looked around in Google for anyone that had real info |
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> about why this problem occurs, couldn't find any that made sense, and |
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> am wondering how to choose a KVM that's going to work out of the box |
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> short of asking for model numbers, etc. |
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|
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I assume these are VGA displays? |
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|
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I've noticed that the CRTs attached to my Win7 box at work don't get |
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configured for the highest refresh rate unless I force it. Also, I've |
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noticed it decide that '1280x1024' is the 'recommended' resolution for |
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my displays, though they'll do 1600x1200@60Hz. |
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|
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It could just be a matter of Windows using 75Hz instead of 85Hz, or |
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60Hz instead of 75Hz. |
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|
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|
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-- |
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:wq |