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DVI port failure with external TMDS transimitter for T510/T5555/C90LE thin clients

Submitted by Ran Huang @huangran

Assigned to Openchrome development list

Link to original bug (#95059)

Description

With my latest testing for DVI port with UMS 0.4.0 driver, here is the current status for the result of my thin clients:

                          DVI-I            DVI-D

HP T510(VX900) fail suc HP T5555(VX900) fail suc Wyse C90LE(VX855) fail X Wyse V90LE(CN700) suc X

From the result we tested, it shows for DVI-D port for T510/T5555, the UMS driver is working fine; By contrast, for T510/T5555 DVI-I port, the UMS driver is failed to work. The possible reason is that DVI-I uses a external TMDS transmitter Silicon Image Sil164 which current UMS driver does not support. For V90LE and C90LE, the result is very interesting because they both uses VT1632 as the external TMDS transmitter, but the result is totally different.

Thanks, Frank