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Old 05-18-2012, 06:54 PM   #1
alanjcastonguay
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Join Date: May 2012
Posts: 1
Default 1.8a1 - missing lines / garbled text

I have three Dell U2410s (max 1920x1200) connected to a Mac Mini running 10.7.4; one on displayport, one on minidisplayport, and one on an IOGEAR External DVI:

Product ID: 0x0059
Vendor ID: 0x17e9 (DisplayLink (UK) Ltd.)
Version: 1.02
Serial Number: 116836
Speed: Up to 480 Mb/sec
Manufacturer: DisplayLink
Location ID: 0x24700000 / 3
Current Available (mA): 500
Current Required (mA): 500

A second displaylink device drives a smaller Dell 1907PFVt monitor in landscape at 1280x1024. UV PLUS:

Product ID: 0x01ae
Vendor ID: 0x17e9 (DisplayLink (UK) Ltd.)
Version: 0.02
Serial Number: 01AE-008165
Speed: Up to 480 Mb/sec
Manufacturer: DisplayLink
Location ID: 0x24100000 / 6
Current Available (mA): 500
Current Required (mA): 500


Upgraded to 1.8a1 from whatever was present prior to upgrading to Lion (when rotation stopped working) and put my third 24" monitor back into use.

I have all three Dell U2410s in 90' rotated portrait mode set to 1200x1900 resolution. On the displaylink-baed monitor, text does not render cleanly, appears similar to missing scan lines. I fear something is being (re)scaled prior to display, or these are compression artifacts. A screenshot taken of all monitors with Preview.app, and displayed on a directly-attached monitor, does not exhibit this behavior.

Further, 1200 x 1920 and 1200 x 1600 appear to render with exactly the same DPI on the screen. However, in the smaller resolution, the bottom 320px of the display remains static, containing old garbage from before the resolution-change. The text-garbling / line-swallowing behavior is present in both resolutions.

Please find output from http://www.displaylink.com/support/ticket.php?id=269 attached. Please let me know if additional information is required.
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Tags
1.8a1, garbled, portrait, rotated, usability

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