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I'm using the latest development version of xenial. My graphics card is
AMD HD7950 and I use an mini-DP to DP converter to connect it to an Acer
XB240H monitor. The system works well in Windows 7.

While using the open source radeon driver, the system was only able to
detect resolution up to 1024x768:

$ xrandr
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 16384 x 16384
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1 connected primary 1024x768+0+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  
HDMI-0 disconnected (normal left inverted right x axis y axis)
DVI-0 disconnected (normal left inverted right x axis y axis)

$ dmesg | grep drm
[    0.615419] [drm] Initialized drm 1.1.0 20060810
[    0.630977] [drm] radeon kernel modesetting enabled.
[    0.633712] fb: switching to radeondrmfb from VESA VGA
[    0.633863] [drm] initializing kernel modesetting (TAHITI 0x1002:0x679A 0x1682:0x3221).
[    0.633870] [drm] register mmio base: 0xF7E00000
[    0.633870] [drm] register mmio size: 262144
[    0.633935] [drm] Changing default dispclk from 500Mhz to 600Mhz
[    0.633942] [drm] Detected VRAM RAM=3072M, BAR=256M
[    0.633943] [drm] RAM width 384bits DDR
[    0.633980] [drm] radeon: 3072M of VRAM memory ready
[    0.633980] [drm] radeon: 2048M of GTT memory ready.
[    0.633985] [drm] Loading tahiti Microcode
[    0.634037] [drm] Internal thermal controller with fan control
[    0.634064] [drm] probing gen 2 caps for device 8086:c01 = 261ad03/e
[    0.638427] [drm] radeon: dpm initialized
[    0.639773] [drm] Found VCE firmware/feedback version 50.0.1 / 17!
[    0.639776] [drm] GART: num cpu pages 524288, num gpu pages 524288
[    0.640486] [drm] probing gen 2 caps for device 8086:c01 = 261ad03/e
[    0.640489] [drm] PCIE gen 3 link speeds already enabled
[    0.655393] [drm] PCIE GART of 2048M enabled (table at 0x00000000002E8000).
[    0.675799] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    0.675800] [drm] Driver supports precise vblank timestamp query.
[    0.675874] [drm] radeon: irq initialized.
[    0.816685] [drm] ring test on 0 succeeded in 1 usecs
[    0.816689] [drm] ring test on 1 succeeded in 1 usecs
[    0.816692] [drm] ring test on 2 succeeded in 1 usecs
[    0.816697] [drm] ring test on 3 succeeded in 3 usecs
[    0.816701] [drm] ring test on 4 succeeded in 2 usecs
[    1.002289] [drm] ring test on 5 succeeded in 1 usecs
[    1.002294] [drm] UVD initialized successfully.
[    1.111494] [drm] ring test on 6 succeeded in 21 usecs
[    1.111505] [drm] ring test on 7 succeeded in 4 usecs
[    1.111505] [drm] VCE initialized successfully.
[    1.111627] [drm] ib test on ring 0 succeeded in 0 usecs
[    1.111648] [drm] ib test on ring 1 succeeded in 0 usecs
[    1.111673] [drm] ib test on ring 2 succeeded in 0 usecs
[    1.111688] [drm] ib test on ring 3 succeeded in 0 usecs
[    1.111702] [drm] ib test on ring 4 succeeded in 0 usecs
[    1.780603] [drm] ib test on ring 5 succeeded
[    2.280602] [drm] ib test on ring 6 succeeded
[    2.780592] [drm] ib test on ring 7 succeeded
[    2.781353] [drm] Radeon Display Connectors
[    2.781354] [drm] Connector 0:
[    2.781354] [drm]   DP-1
[    2.781355] [drm]   HPD5
[    2.781356] [drm]   DDC: 0x6530 0x6530 0x6534 0x6534 0x6538 0x6538 0x653c 0x653c
[    2.781357] [drm]   Encoders:
[    2.781357] [drm]     DFP1: INTERNAL_UNIPHY2
[    2.781358] [drm] Connector 1:
[    2.781358] [drm]   DP-2
[    2.781359] [drm]   HPD4
[    2.781360] [drm]   DDC: 0x6540 0x6540 0x6544 0x6544 0x6548 0x6548 0x654c 0x654c
[    2.781360] [drm]   Encoders:
[    2.781361] [drm]     DFP2: INTERNAL_UNIPHY2
[    2.781361] [drm] Connector 2:
[    2.781362] [drm]   HDMI-A-1
[    2.781362] [drm]   HPD1
[    2.781363] [drm]   DDC: 0x6550 0x6550 0x6554 0x6554 0x6558 0x6558 0x655c 0x655c
[    2.781363] [drm]   Encoders:
[    2.781364] [drm]     DFP3: INTERNAL_UNIPHY1
[    2.781364] [drm] Connector 3:
[    2.781365] [drm]   DVI-I-1
[    2.781365] [drm]   HPD3
[    2.781366] [drm]   DDC: 0x6580 0x6580 0x6584 0x6584 0x6588 0x6588 0x658c 0x658c
[    2.781367] [drm]   Encoders:
[    2.781367] [drm]     DFP4: INTERNAL_UNIPHY
[    2.781368] [drm]     CRT1: INTERNAL_KLDSCP_DAC1
[    2.821395] [drm] fb mappable at 0xE06EA000
[    2.821396] [drm] vram apper at 0xE0000000
[    2.821397] [drm] size 3145728
[    2.821397] [drm] fb depth is 24
[    2.821398] [drm]    pitch is 4096
[    2.821451] fbcon: radeondrmfb (fb0) is primary device
[    2.821497] radeon 0000:01:00.0: fb0: radeondrmfb frame buffer device
[    2.832610] [drm] Initialized radeon 2.43.0 20080528 for 0000:01:00.0 on minor 0
[    3.888602] [drm:radeon_dp_link_train [radeon]] *ERROR* channel eq failed: 5 tries
[    3.888612] [drm:radeon_dp_link_train [radeon]] *ERROR* channel eq failed

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Radeon driver only provides 1024x768 resolution
https://bugs.launchpad.net/bugs/1552693
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