thank you very much for your reply. I have just tested the RGB and the DVI to the Lenovo 2503 Advanced dock and confirm that both routes are working natively in Dpup Stretch (4.1.48 on the ol T60, 3Gb RAM, 2.2Ghz Centrino Duo). Moreover, without a savefile used in this fresh frugal install, the 15.4" LCD and Acer X193hq monitor are automatically sync'ed as a single wide screen - 2646x800 (24bit), using the ATI video driver this time.
My current PCIe videocard doesn't have RGB/VGA so unable to check that the VGA route to the 2nd monitor is viable, or disregarded as per the earlier post re the DVI. It seems likely that the PCIe graphics card doesn't gel with the nouveau Xorg driver settings. I do have another PCIe video card I can test, down the line. Apologies for my delay in reporting and absence for a few days - RL beckons
EDIT: oops forgot - hope the following is useful for comparison
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▶—— Video ——◀
Display Specifications:
• Monitor VertRefresh: 60.00 times/s
• Screen Dimensions: 2646x800 pixels (700x211 millimeters)
• Screen Depth: 24 bits (planes)
Xorg Startup Log (/var/log/Xorg.0.log):
• Xorg Driver in use: ati
• Loaded Modules: dbe dri2 exa fb fbdevhw glx kbd mouse radeon ramdac synaptics
• X.Org version: 1.19.2
OpenGL 2D/3D Rendering:
• Direct Rendering: Yes
• Vendor: X.Org R300 Project
• Renderer: Gallium 0.4 on ATI RV515
• Version: 2.1 Mesa 13.0.6
VGA controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] RV515/M54 [Mobility Radeon X1400] [1002:7145]
• Kernel Driver: radeon
--
VGA controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Caicos XTX [Radeon HD 8490 / R5 235X OEM] [1002:6771]
• Kernel Driver: radeon
• Memory Used by Driver: 1415.58 KB
• Path: /lib/modules/4.1.48/kernel/drivers/gpu/drm/radeon/radeon.ko
• Description: ATI Radeon
VGA controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] RV515/M54 [Mobility Radeon X1400] [1002:7145]
• Kernel Driver: radeon
--
VGA controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Caicos XTX [Radeon HD 8490 / R5 235X OEM] [1002:6771]
• Kernel Driver: radeon
• Memory Used by Driver: 1415.58 KB
• Path: /lib/modules/4.1.48/kernel/drivers/gpu/drm/radeon/radeon.ko
• Description: ATI Radeon