Help with Resolution on External Monitor

I want to set my HP Envy 15t to drive an external monitor, not as an extension, but rather as my primary monitor. My external monitor is a Viewsonic VX2250, a little older, and requires that I use a HDMI-to-VGA adapter. (The Viewsonic also has DVI inputs...not sure it that would make a difference.) On my current tower setup, I use the monitor in its recommended (or native mode) setting of 1920x1080. I like this screen a lot.
The adapter is a Bytecc HM-VGA005 and the specs seem to suggest that it can handle a variety of video resolutions - Full HD (1080p), WUXGA (1920x1200 RB mode), and UXGA (1600x1200 VESA mode).
The 15t currently runs in the recommended resolution of 1366x768. If I understand the specs right, in HD mode it's 1366x768 and in FHD mode it's 1920x1080. The graphics card is an Intel HD Graphics 4600. Is this the reason that I can only get HD resolution and not FHD resolution on the laptop?
But whenever I plug all this together and try and change the laptop screen resolution settings, the external monitor only shows 1024x768...pretty lousy. I have it so that the laptop screen is dark and only the external monitor is on. But there doesn't seem to be any choices I can make to improve this resolution. I've checked to see that the graphics driver is up to date and it is.
What do I do to get the best screen I can on the external monitor? Would buying a new monitor with HDMI inputs achieve better results? Do I need a different adapter?
Thanks...Kurt
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Me again! Well, it was a bit of the nut behind the wheel. I checked in with the store that I've been buying my cables, adapters, etc. He said to bring the Viewsonic monitor by to see what might be going on. As I was setting up, he asked about power to the adapter. I had the USB cable but didn't think it was needed. But after putting everything together in addition to power to the HDMI-VGA adapter, I could see I was getting the resolution that I was hoping for. Why it worked on the Dell monitor, no clue...maybe a better monitor or different VGA cable. The Bytecc adpater didn't come with any instructions, so I just didn't know.
All is well. Hope this helps someone in the future.
Kurt

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