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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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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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