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Second monitor stopped working in correct resolution

Brief issue description:

Laptop stopped recognizing second monitor properly. Works in 1024x768 instead of 1680x1050 now. Higher resolutions miss from settings. NOT a new monitor, worked with this laptop just fine before. How to fix?

More details:

I have a Lenovo ThinkPad T400 laptop with Fedora 22 (KDE spin) and kernel-4.2.8-200 on board with dual monitors. One is its own LCD (1440x900), the other one is Samsung SyncMaster 2043NW (1680x1050), hooked up to a VGA port. It all has operated just fine until earlier today.

I was using it dual monitor this morning, then detached the second monitor and took the laptop with me to surf the web on couch for a couple hours (and that's exactly what I consequently did, I didn't install or remove anything), then I reattached it, and boom! No more 16:10 second display, its video output is 4:3 now, 1024x768, vertically stretched, with black stripes on the sides. I can't set it to any resolution higher than that. Any ideas how to make it work in 1680x1050 again?

What I've already done:

  1. Rebooted several times, detaching the monitor and reattaching it before, during and after the reboot. No luck.
  2. Tried every possible combination of settings in Display Configuration (not like there were a lot of, though). No luck.
  3. Updated the system (as that sometimes solved the minor issues, priorly appearing out of nowhere). No luck.
  4. Tried to Google. No luck: machine of literally every other similar thread's OP fails to recognize his second monitor right from the start, while mine did it just fine not half a day ago!
  5. Performed several tests, results are in the section below.

Additional facts to help with diagnosing the issue:

  • The second monitor fell off the platform it stands on a day ago, detaching from the power cord, but not from the VGA. But when I plugged the power back in, it continued to work properly. The moment when the laptop stopped recognizing it may be the first time I detached it ever since. I don't exactly remember.
  • In System Settings —> Display and Monitor —> Display Configuration it used to show up as Samsung SyncMaster, or something of a kind. Now it shows up as VGA1.
  • Live versions of Fedora 22-3, OpenSUSE Leap 42.1, Ubuntu 14.0.3 LTS and Arch Linux 2016.01.01 now all recognize my second monitor the same way (1024x768, don't detect the model). May not be the clue as I don't remember running any Live versions dual monitor ever before, so I don't know, how should they behave on this H/W.
  • Windows 8.1 recognizes it properly as a secondary monitor right away (tested with my GF's laptop).
  • As a primary one, though, Windows 8.1 at first failed to recognize it, but then I restored factory settings of the monitor and it started being recognized properly (tested with my desktop PC with nVidia GTX 550 Ti on board).
  • After restoring monitor's factory settings I reattached it back to the laptop. The image is stretched to the full width now, but the laptop still thinks it's 1024x768, so the elements are too big, blurry, and the aspect ratio is wrong.
  • Haven't yet tested it with Mac OS X, as my Mid 2008 MBP only has DVI, so I need a VGA to DVI adapter to test it, which I cannot get right now as it's 3 A.M. where I live. But I can get it the next morning, if needed.
  • Here's what xrandr tells me:

    Screen 0: minimum 8 x 8, current 1440 x 1668, maximum 32767 x 32767 LVDS1 connected primary 1440x900+0+768 (normal left inverted right x axis y axis) 303mm x 190mm 1440x900 60.00+ 50.00
    1280x800 60.00
    1024x768 60.00
    800x600 60.32 56.25
    720x450 60.00
    640x480 59.94
    DP1 disconnected (normal left inverted right x axis y axis) DP2 disconnected (normal left inverted right x axis y axis) DP3 disconnected (normal left inverted right x axis y axis) HDMI1 disconnected (normal left inverted right x axis y axis) HDMI2 disconnected (normal left inverted right x axis y axis) VGA1 connected 1024x768+208+0 (normal left inverted right x axis y axis) 0mm x 0mm 1024x768 60.00
    800x600 60.32 56.25
    848x480 60.00
    640x480 59.94
    VIRTUAL1 disconnected (normal left inverted right x axis y axis)

Second monitor stopped working in correct resolution

Brief issue description:

Laptop stopped recognizing second monitor properly. Works in 1024x768 instead of 1680x1050 now. Higher resolutions miss from settings. NOT a new monitor, worked with this laptop just fine before. How to fix?

More details:

I have a Lenovo ThinkPad T400 laptop with Fedora 22 (KDE spin) and kernel-4.2.8-200 on board with dual monitors. One is its own LCD (1440x900), the other one is Samsung SyncMaster 2043NW (1680x1050), hooked up to a VGA port. It all has operated just fine until earlier today.

I was using it dual monitor this morning, then detached the second monitor and took the laptop with me to surf the web on couch for a couple hours (and that's exactly what I consequently did, I didn't install or remove anything), then I reattached it, and boom! No more 16:10 second display, its video output is 4:3 now, 1024x768, vertically stretched, with black stripes on the sides. I can't set it to any resolution higher than that. Any ideas how to make it work in 1680x1050 again?

What I've already done:

  1. Rebooted several times, detaching the monitor and reattaching it before, during and after the reboot. No luck.
  2. Tried every possible combination of settings in Display Configuration (not like there were a lot of, though). No luck.
  3. Updated the system (as that sometimes solved the minor issues, priorly appearing out of nowhere). No luck.
  4. Tried to Google. No luck: machine of literally every other similar thread's OP fails to recognize his second monitor right from the start, while mine did it just fine not half a day ago!
  5. Performed several tests, results are in the section below.

Additional facts to help with diagnosing the issue:

  • The second monitor fell off the platform it stands on a day ago, detaching from the power cord, but not from the VGA. But when I plugged the power back in, it continued to work properly. The moment when the laptop stopped recognizing it may be the first time I detached it ever since. I don't exactly remember.
  • In System Settings —> Display and Monitor —> Display Configuration it used to show up as Samsung SyncMaster, or something of a kind. Now it shows up as VGA1.
  • Live versions of Fedora 22-3, OpenSUSE Leap 42.1, Ubuntu 14.0.3 LTS and Arch Linux 2016.01.01 now all recognize my second monitor the same way (1024x768, don't detect the model). May not be the clue as I don't remember running any Live versions dual monitor ever before, so I don't know, how should they behave on this H/W.
  • Windows 8.1 recognizes it properly as a secondary monitor right away (tested with my GF's laptop).
  • As a primary one, though, Windows 8.1 at first failed to recognize it, but then I restored factory settings of the monitor and it started being recognized properly (tested with my desktop PC with nVidia GTX 550 Ti on board).
  • After restoring monitor's factory settings I reattached it back to the laptop. The image is stretched to the full width now, but the laptop still thinks it's 1024x768, so the elements are too big, blurry, and the aspect ratio is wrong.
  • Haven't yet tested it with Mac OS X, as my Mid 2008 MBP only has DVI, so I need a VGA to DVI adapter to test it, which I cannot get right now as it's 3 A.M. where I live. But I can get it the next morning, if needed.
  • Here's what xrandr tells me:

    Screen 0: minimum 8 x 8, current 1440 x 1668, maximum 32767 x 32767 LVDS1 connected primary 1440x900+0+768 (normal left inverted right x axis y axis) 303mm x 190mm 1440x900 60.00+ 50.00
    1280x800 60.00
    1024x768 60.00
    800x600 60.32 56.25
    720x450 60.00
    640x480 59.94
    DP1 disconnected (normal left inverted right x axis y axis) DP2 disconnected (normal left inverted right x axis y axis) DP3 disconnected (normal left inverted right x axis y axis) HDMI1 disconnected (normal left inverted right x axis y axis) HDMI2 disconnected (normal left inverted right x axis y axis) VGA1 connected 1024x768+208+0 (normal left inverted right x axis y axis) 0mm x 0mm 1024x768 60.00
    800x600 60.32 56.25
    848x480 60.00
    640x480 59.94
    VIRTUAL1 disconnected (normal left inverted right x axis y axis)