Thank you for your quick response! This regression / bug was found out almost 2 YEARS ago: https://bbs.archlinux.org/viewtopic.php?id=225215 and a patch was sent to upstream (see post #2), but apparently it was never pulled.
Regarding hex vs dec, the file in master they seem to be mixing both: https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/drm_edid.c The product id number for a specific panel is found in Xorg.log: fgrep EDID /var/log/Xorg.0.log [ 751.496] (II) modeset(0): EDID vendor "SDC", prod id 18514 Anyway, I am hoping that Ubuntu, which has the biggest base of desktop Linux users (and in particular of people who may have bought laptops without pre-installed Windows, like Lenovo G50-80 and G50-70), would choose to fix this regression for Ubuntu users. ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- 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: Confirmed 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 : 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 : 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:  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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1819968/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : email@example.com Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp