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Windows 10 doesnt have support for Mobilty drivers, but there is a work around, try following this steps:
1 - Open Device Manager. Right click in the Start Menu button (The Wndows logo in the bottom left of the screen) and click Device Manager.
2 - Locate your Display Drivers on the list (Post a picture of this if my solution doesnt work)
3 - Right click in the Mobility driver.
4 - Select Update software
5 - Select bottom option to search on your PC
6 - Select bottom option again to select from a list
7 - Select the older driver. Windows update downloads a driver that works, you should be able to find it in this list, is a old versión with a very recent date, this driver versión should work.
8 - Click on next and wait while it updates, the screen will flicker for a while.
9 - Restart your PC after all he flickering is done.
10 - Try to detect a screen now.and change the resolution
Thank you for the reply. I tried as you suggested. It installs a driver from Windows update that works but it doesn't have any scaling options. That's what I need to eliminate the black border around the desktop when I output to the TV. It says the resolution on the TV screen is 1920x1080, however there is still the black border around it, which I don't want.
A scaling feature to stretch the image would solve this, but there is none available (I have used this before on other systems). Neither the AMD driver or the Windows driver has a scaling option. I think it might be because my GPU is too old and all features are not supported for it in the current OSes. I wonder if there is a third party program I can download to let me change the scaling?
I have the same problem like yours, with the black boarder around. AMD should really consider to officially release a drive to support those old cards, otherwise, people just leave.
I try the instruction the link below, and it works for me.
Follow this instruction, and step by step. AMD Radeon HD 4000 Series Overscan / Underscan fix on Windows 10
My card is AMD Radeon HD4200.
Unfortunately, the HD4xxx series of products does not meet the minimum Windows 10 hardware requirements.
More information on supported products is available here : FAQ: Windows® 10 Driver and AMD Graphics Product Compatibility
Then, what are we, laptop users, supposed to do?
Be outcasted to an old OS because AMD doesnt consider us important enough?
Or should we use Windows 10 with the unsupported hardware?
I for example have a discrete Radeon HD 6470M connected to an integrated Mobility 4250. If I use the drivers given by Windows Update, I cant select programs to use the discrete card only. Making it so only the integrated one works. Should I just disconnect the other card since it cant be used?
Thanks for the link. I tried the registry hack but now my desktop is bigger than the bounds of the screen. Not sure how to get it perfect using the registry and not an overscan control which is now not supported by the driver.