$ xrandr --props
Screen 0: minimum 320 x 200, current 1366 x 768, maximum 32767 x 32767
VGA1 connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 
410mm x 230mm
        EDID:
                00ffffffffffff001e6d094c07230800
                071601036c291778ead025a258559c28
                0f5054a76a00314f454f614f81c00101
                010101010101662156aa51001e30468f
                33009ae61000001e000000fd00384b1e
                3d09000a202020202020000000fc0045
                313934320a20202020202020000000ff
                003230374e444e5546503235350a005e
   1366x768      59.79*+
   1280x720      59.97 +
   1024x768      75.08    75.03    60.00
   832x624       74.55
   800x600       75.00    60.32    56.25
   640x480       75.00    60.00
   720x400       70.08
HDMI1 disconnected (normal left inverted right x axis y axis)
        Broadcast RGB: Automatic
                supported: Automatic, Full, Limited 16:235
        audio: auto
                supported: force-dvi, off, auto, on
DP1 disconnected (normal left inverted right x axis y axis)
        Broadcast RGB: Automatic
                supported: Automatic, Full, Limited 16:235
        audio: auto
                supported: force-dvi, off, auto, on
VIRTUAL1 disconnected (normal left inverted right x axis y axis)


$ find /sys/devices/ |fgrep -i edid
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-1/edid
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/edid
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-2/edid
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-DP-1/edid

$ xxd /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-1/edid
$ xxd /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/edid
00000000: 00ff ffff ffff ff00 4c83 5248 0000 0000  ........L.RH....
00000010: 0018 0103 9522 1378 0a71 0593 5557 8f29  .....".x.q..UW.)
00000020: 2050 5400 0000 0101 0101 0101 0101 0101   PT.............
00000030: 0101 0101 0101 411c 56a0 5000 1630 3020  ......A.V.P..00
00000040: 2500 58c2 1000 0019 0000 000f 0000 0000  %.X.............
00000050: 0000 0000 0020 5203 1500 0000 00fe 0053  ..... R........S
00000060: 414d 5355 4e47 0a20 4c83 4154 0000 00fe  AMSUNG. L.AT....
00000070: 004c 544e 3135 3641 5433 374c 3032 00db  .LTN156AT37L02..
$ xxd /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-2/edid
$ xxd /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-DP-1/edid
$


** Description changed:

  Colour bandind is visible everywhere in the system. I believe it's not a
  hardware problem, since booting with 'nomodeset' works as expected and
  the previously installed Ubuntu 14.04 also worked.
  
  I tried installing kernel 4.18.0-16.17 from ppa:canonical-kernel-
  team/ppa but the problem remained.
  
  There were already similar bugs, https://bugs.launchpad.net/bugs/1749420
  , https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1794387 and
  https://bugs.launchpad.net/bugs/1788308, but the fixes provided for
  those bugs did not work for my specific monitor.
  
  cat /proc/version_signature
  Ubuntu 4.15.0-46.49-generic 4.15.18
  
  sudo lspci -vnvn
  00:00.0 Host bridge [0600]: Intel Corporation Haswell-ULT DRAM Controller 
[8086:0a04] (rev 0b)
-       Subsystem: Lenovo Haswell-ULT DRAM Controller [17aa:390b]
-       Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx-
-       Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort+ >SERR- <PERR- INTx-
-       Latency: 0
-       Capabilities: [e0] Vendor Specific Information: Len=0c <?>
-       Kernel driver in use: hsw_uncore
+  Subsystem: Lenovo Haswell-ULT DRAM Controller [17aa:390b]
+  Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx-
+  Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort+ >SERR- <PERR- INTx-
+  Latency: 0
+  Capabilities: [e0] Vendor Specific Information: Len=0c <?>
+  Kernel driver in use: hsw_uncore
  
  00:02.0 VGA compatible controller [0300]: Intel Corporation Haswell-ULT 
Integrated Graphics Controller [8086:0a16] (rev 0b) (prog-if 00 [VGA 
controller])
-       Subsystem: Lenovo Haswell-ULT Integrated Graphics Controller [17aa:390b]
-       Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx+
-       Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR- INTx-
-       Latency: 0
-       Interrupt: pin A routed to IRQ 46
-       Region 0: Memory at b0000000 (64-bit, non-prefetchable) [size=4M]
-       Region 2: Memory at a0000000 (64-bit, prefetchable) [size=256M]
-       Region 4: I/O ports at 4000 [size=64]
-       [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
-       Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
-               Address: fee02004  Data: 4023
-       Capabilities: [d0] Power Management version 2
-               Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA 
PME(D0-,D1-,D2-,D3hot-,D3cold-)
-               Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
-       Capabilities: [a4] PCI Advanced Features
-               AFCap: TP+ FLR+
-               AFCtrl: FLR-
-               AFStatus: TP-
-       Kernel driver in use: i915
-       Kernel modules: i915
+  Subsystem: Lenovo Haswell-ULT Integrated Graphics Controller [17aa:390b]
+  Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx+
+  Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR- INTx-
+  Latency: 0
+  Interrupt: pin A routed to IRQ 46
+  Region 0: Memory at b0000000 (64-bit, non-prefetchable) [size=4M]
+  Region 2: Memory at a0000000 (64-bit, prefetchable) [size=256M]
+  Region 4: I/O ports at 4000 [size=64]
+  [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
+  Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
+   Address: fee02004  Data: 4023
+  Capabilities: [d0] Power Management version 2
+   Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
+   Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
+  Capabilities: [a4] PCI Advanced Features
+   AFCap: TP+ FLR+
+   AFCtrl: FLR-
+   AFStatus: TP-
+  Kernel driver in use: i915
+  Kernel modules: i915

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1819968

Title:
  Colour banding in Lenovo G50-80 laptop display (i915)

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Colour bandind is visible everywhere in the system. I believe it's not
  a hardware problem, since booting with 'nomodeset' works as expected
  and the previously installed Ubuntu 14.04 also worked.

  I tried installing kernel 4.18.0-16.17 from ppa:canonical-kernel-
  team/ppa but the problem remained.

  There were already similar bugs,
  https://bugs.launchpad.net/bugs/1749420 ,
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1794387 and
  https://bugs.launchpad.net/bugs/1788308, but the fixes provided for
  those bugs did not work for my specific monitor.

  cat /proc/version_signature
  Ubuntu 4.15.0-46.49-generic 4.15.18

  sudo lspci -vnvn
  00:00.0 Host bridge [0600]: Intel Corporation Haswell-ULT DRAM Controller 
[8086:0a04] (rev 0b)
   Subsystem: Lenovo Haswell-ULT DRAM Controller [17aa:390b]
   Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx-
   Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort+ >SERR- <PERR- INTx-
   Latency: 0
   Capabilities: [e0] Vendor Specific Information: Len=0c <?>
   Kernel driver in use: hsw_uncore

  00:02.0 VGA compatible controller [0300]: Intel Corporation Haswell-ULT 
Integrated Graphics Controller [8086:0a16] (rev 0b) (prog-if 00 [VGA 
controller])
   Subsystem: Lenovo Haswell-ULT Integrated Graphics Controller [17aa:390b]
   Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx+
   Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR- INTx-
   Latency: 0
   Interrupt: pin A routed to IRQ 46
   Region 0: Memory at b0000000 (64-bit, non-prefetchable) [size=4M]
   Region 2: Memory at a0000000 (64-bit, prefetchable) [size=256M]
   Region 4: I/O ports at 4000 [size=64]
   [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
   Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
    Address: fee02004  Data: 4023
   Capabilities: [d0] Power Management version 2
    Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
    Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
   Capabilities: [a4] PCI Advanced Features
    AFCap: TP+ FLR+
    AFCtrl: FLR-
    AFStatus: TP-
   Kernel driver in use: i915
   Kernel modules: i915

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