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[Bug 1493997] Re: Resolution max at 640x440


I just found some interresting variant when pluggin a VGA screen to the
DB15 at the same time.

If you plug a screen of the DB15 external port and set option to
"modeset=0", you will get the full 1024x768 screen as mirror on both
LVDS and VGA screens (default screen with 1024x768 76.0 ).

A quick tests summary of all the additional tests I've done :

No kernel options  --> Black screen on LVDS but 1920x1080 on DB15
modeset=1  -->  1024x768 on LVDS black on DB15
modeset=1 video=inteldrmfb:mode=1024x768 --> Black screen on LVDS but 1920x1080 on DB15
"" (empty param) --> same result as previous test
modeset=0  (case described earlier)-> 1024x768 on both screens in mirror mode

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  Resolution max at 640x440

Status in linux package in Ubuntu:

Bug description:
  It is a follow up of bug 874694 (see it for history).

  On the i845 and derivated chipset enabled laptop the max resolution on
  the LVDS panel will be stuck to 640x480 (and not higher resolution as
  supported by both the chipset and the LVDS panel)

  In latest Ubuntu the "workaround" i915.modeset=0 that previously
  provide some alternative is no more working. This bug is clearly
  blocking usage on older machine using those chipset.

  Only known workaround left is to use an external monitor on the VGA
  port at the same time to get higher resolution on both output (mirror

  There maybe some issue at initialization time around computation for
  max resolution due to the fact it has : LVDS, VGA, S-VIDEO ...

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-26-generic 3.19.0-26.28
  ProcVersionSignature: Ubuntu 3.19.0-26.28-generic 3.19.8-ckt4
  Uname: Linux 3.19.0-26-generic i686
  ApportVersion: 2.17.2-0ubuntu1.3
  Architecture: i386
   /dev/snd/controlC0:  bjb        1429 F.... pulseaudio
  CurrentDesktop: XFCE
  Date: Wed Sep  9 22:22:05 2015
  HibernationDevice: RESUME=UUID=c4b15956-7e93-413b-8625-c260800d1916
   lo        no wireless extensions.
   eth0      no wireless extensions.
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: FUJITSU SIEMENS Amilo L Series
   Socket 0:
     no product info available
   Socket 0:
     no card
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-26-generic root=UUID=723e8f93-171f-4fb2-84ec-5efaa0aac4a1 ro splash quiet vt.handoff=7
   linux-restricted-modules-3.19.0-26-generic N/A
   linux-backports-modules-3.19.0-26-generic  N/A
   linux-firmware                             1.143.3
  SourcePackage: linux
  UdevLog: Error: [Errno 2] Aucun fichier ou dossier de ce type: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 06/18/2004
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1.07
  dmi.board.name: 755II5
  dmi.board.vendor: Uniwill
  dmi.chassis.type: 10
  dmi.chassis.vendor: FUJITSU SIEMENS
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.07:bd06/18/2004:svnFUJITSUSIEMENS:pnAmiloLSeries:pvr:rvnUniwill:rn755II5:rvr:cvnFUJITSUSIEMENS:ct10:cvr:
  dmi.product.name: Amilo L Series
  dmi.sys.vendor: FUJITSU SIEMENS

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