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  1. Joined : Aug 2015
    Posts : 28
    Windows 10
       08 Aug 2015 #1

    AMD Radeon HD7700 - Stuck at 640 x 480 Resolution


    I have a Dell 8500 that I recently upgraded from Microsoft Windows 8.1 Professional to Windows 10 Professional. The upgrade went smooth but after a few days the system would only boot with a resolution of 640x480. The AMD Radeon HD 7700 is connected via DisplayPort to a Dell U2312HM monitor.

    I tried every solution that I could find on the Web and still could not resolve the issue. I did a complete uninstall of the latest AMD Windows 10 Drivers. Since the resolution was stuck at 640x480 I was unable to re-install the drivers.

    Based on a suggestion from one Windows TenForums I was going to attempt to use another connections on the Dell U2312M monitor. This monitor has a DisplayPort, Mini Display Port and a DVI.

    I unplugged the DisplayPort Cable from the AMD Radeon HD 7700 to get a better look at the available connectors. The video card has a DVI, DDMI and DisplayPort. Since I did not have a long enough cable to go to the monitor I plugged the DisplayPort cable back in.

    When I re-started the computer the resolution was back to the 1920 x 1080.

    I checked with two other friends that were having similar issues with a Dell and HP computer stuck at 640 x 480 and removing an reinserting the DisplayPort Cable. I suspect I would have had the same results if I powered down both the computer and the monitor. In all case the monitors and computers had not been powered down at the same time.

    Hope this helps someone.
      My System SpecsSystem Spec


  2. Joined : Aug 2015
    Posts : 28
    Windows 10
       29 Aug 2015 #2

    The problem re-occurs about every two weeks. The only way to recover is to unplug the DisplayPort cable from the video plug. I am going to try replacing the cable to see if that makes a difference. Powering down the monitor and computer does not correct the issue.

    I have the latest AMD Radeon drivers installed and Windows 10 Pro has been updated with the latest patches.
      My System SpecsSystem Spec


  3. Joined : Oct 2014
    Posts : 461
    ,7,8.1 10TP 10upgrade,MINT
       31 Aug 2015 #3

    A DVI cable is cheap on ebay and would eliminate any worries over connection with the DP.
      My System SpecsSystem Spec


  4. Joined : Sep 2015
    Posts : 1
    Windows 10 64 bit
       12 Sep 2015 #4

    I had the exact same problem with Windows 10 with a AMD Radeon HD 7700 and a Dell Ultrasharp monitor on a display port connection, unplugging it fixed it. Thank you!

    I previously tried re-installing the latest AMD Catalyst drivers to fix the solution.
      My System SpecsSystem Spec


  5. Joined : Sep 2015
    Posts : 1
    Windows 10
       14 Sep 2015 #5

    Display port cable unplug fixes 640 by 480 problem


    PLCMAN58 said: View Post
    I have a Dell 8500 that I recently upgraded from Microsoft Windows 8.1 Professional to Windows 10 Professional. The upgrade went smooth but after a few days the system would only boot with a resolution of 640x480. The AMD Radeon HD 7700 is connected via DisplayPort to a Dell U2312HM monitor.

    I tried every solution that I could find on the Web and still could not resolve the issue. I did a complete uninstall of the latest AMD Windows 10 Drivers. Since the resolution was stuck at 640x480 I was unable to re-install the drivers.

    Based on a suggestion from one Windows TenForums I was going to attempt to use another connections on the Dell U2312M monitor. This monitor has a DisplayPort, Mini Display Port and a DVI.

    I unplugged the DisplayPort Cable from the AMD Radeon HD 7700 to get a better look at the available connectors. The video card has a DVI, DDMI and DisplayPort. Since I did not have a long enough cable to go to the monitor I plugged the DisplayPort cable back in.

    When I re-started the computer the resolution was back to the 1920 x 1080.

    I checked with two other friends that were having similar issues with a Dell and HP computer stuck at 640 x 480 and removing an reinserting the DisplayPort Cable. I suspect I would have had the same results if I powered down both the computer and the monitor. In all case the monitors and computers had not been powered down at the same time.

    Hope this helps someone.
    Thank you very much for posting this, I had the same problem with Nvidia GTX660 and restart, uninstall hardware, update driver etc etc had no effect, unplugging the cable immediately fixed the problem.

    I should add that the monitor is a Dell 2412M and it now appears that the problem lies with the monitor DisplayPort firmware.
      My System SpecsSystem Spec


  6. Joined : Aug 2015
    Posts : 28
    Windows 10
       16 Sep 2015 #6

    My computer keeps reverting back to 640x480 and I am getting tired to un-plugging and plugging in the DisplayPort cable to fix the issue. I am now connected via a DVI cable . The monitor is a Dell U2312HM.
      My System SpecsSystem Spec


  7. Joined : Nov 2015
    Posts : 5
    Windows 10
       12 Nov 2015 #7

    Same problem - root cause?


    Steerpike said: View Post
    Thank you very much for posting this, I had the same problem with Nvidia GTX660 and restart, uninstall hardware, update driver etc etc had no effect, unplugging the cable immediately fixed the problem.

    I should add that the monitor is a Dell 2412M and it now appears that the problem lies with the monitor DisplayPort firmware.
    Hi,

    I'm new to the forum and found this thread, as I have the same problem with my Dell PC and Dell U2312HM monitor connected via DP cable.

    How I ran into the problem: I recently switched from using a VGA cable to using a DP cable. This worked fine for some weeks. A few days ago suddenly the problem showed up when re-activating the computer from sleep mode.

    Reading through the thread I can confirm the problem goes away only by unplugging + replugging the DP cable or by unplugging the power cable from the monitor. But as soon as I send my system to sleep and wake it up again, the problem back

    UPDATE: I installed a new Intel graphics driver. It seems at the very moment the problem is gone. At least I had to reboot the system and tried some sleep-wakeup cycles to check, if the problem comes back.

    Still my question: Do I understand correctly that the root cause of the problem is with the Dell monitor firmware for displayport? Why would a graphics driver update then fix the problem?!? (I'm sceptical.)


    Thanks,
    barney
      My System SpecsSystem Spec


  8. Joined : Sep 2015
    Posts : 2,087
    Windows 10 Pro 64-bit 1607 (AE build 14393.693)
       12 Nov 2015 #8

    Probably the graphics card doesn't communicate with the monitor properly through the DisplayPort when trying to determine the native resolution. Assuming it has to do with a very basic monitor, it reverts to 640x480 for compatibility. Updating the drivers could eliminate any bugs and fix the problem. Also see if there is any firmware to update the monitor.
      My System SpecsSystem Spec


  9. Joined : Nov 2015
    Posts : 5
    Windows 10
       12 Nov 2015 #9

    Mhm, this could be an explaination. I was searching for a firmware update, but couldn't find anything in this regards. Let's see if just updating the graphics driver now works permanently or if the problem comes back.

    Thanks a lot for the additional advice.
      My System SpecsSystem Spec


  10. Joined : Nov 2015
    Posts : 2
    win 10
       18 Nov 2015 #10

    Spent some time trying to solve this. Did a lot of changing video drivers but it all solved after unplugging and rebooting.
    First time it happend to me.
    radeon 7830 and dell ultra sharp, vai display port.
      My System SpecsSystem Spec


 
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