[i915gm] max external monitor resolution 800x600 instead of 1024x768

[emmanuel_vivaldi]

Binary package hint: xorg

my video card is
"Intel Corporation Mobile 915GM/GMS/910GML Express Graphics"

my external monitor is
Acer V551

In Screen Preferences my monitor is "ACER AMERICA 13" with lower resolution than 800x600

ProblemType: Bug
Architecture: i386
CheckboxCommand: resolution_test
CheckboxDescription:
 Esta pantalla está usando la siguiente resolución:

 $output

 ¿Es aceptable para su pantalla?
CheckboxSubmission: 460a23ed28d4198650175d5a0ccaf4fe
CheckboxSystem: 5e619508ecb646cb38ed0a88ca1e5a92
CheckboxTest: resolution
Date: Wed Nov 11 11:58:28 2009
DistroRelease: Ubuntu 9.10
MachineType: TOSHIBA Satellite M55
Package: xorg 1:7.4+3ubuntu7
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcCmdLine: root=UUID=f86d1186-c454-4e2d-a47b-d3f70a1f59cd ro splash vga=792 quiet
ProcEnviron:
 SHELL=/bin/bash
 LANG=es_MX.UTF-8
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
RelatedPackageVersions:
 xserver-xorg 1:7.4+3ubuntu7
 libgl1-mesa-glx 7.6.0-1ubuntu4
 libdrm2 2.4.14-1ubuntu1
 xserver-xorg-video-intel 2:2.9.0-1ubuntu2
 xserver-xorg-video-ati 1:6.12.99+git20090929.7968e1fb-0ubuntu1
SourcePackage: xorg
Tags: checkbox-bug
Uname: Linux 2.6.31-14-generic i686
dmi.bios.date: 06/07/2005
dmi.bios.vendor: TOSHIBA
dmi.bios.version: V1.20
dmi.board.name: ECU00
dmi.board.vendor: TOSHIBA
dmi.board.version: Null
dmi.chassis.asset.tag: *
dmi.chassis.type: 10
dmi.chassis.vendor: TOSHIBA
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnTOSHIBA:bvrV1.20:bd06/07/2005:svnTOSHIBA:pnSatelliteM55:pvrPSM50U-021015:rvnTOSHIBA:rnECU00:rvrNull:cvnTOSHIBA:ct10:cvrN/A:
dmi.product.name: Satellite M55
dmi.product.version: PSM50U-021015
dmi.sys.vendor: TOSHIBA
fglrx: Not loaded
system:
 distro: Ubuntu
 architecture: i686kernel: 2.6.31-14-generic

[lspci]
00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller [8086:2592] (rev 03)
     Subsystem: Toshiba America Info Systems Device [1179:ff03]

[Geir Ove Myhr (gomyhr)]

It seems that the reason the 1024x768 mode is not available is that there is something wrong with the EDID information. From XorgLog.txt:

(II) intel(0): Not using mode "1024x768" (bad mode clock/interlace/doublescan)

There have been a lot of resolution quirks in newer kernels. It is possible that this has already be fixed in Lucid. Could you give Lucid a try? You can download a LiveCD daily image from http://cdimage.ubuntu.com/daily-live/ and the latest milestone from http://cdimage.ubuntu.com/releases/10.04/ . You may also test the latest kernels from http://kernel.ubuntu.com/~kernel-ppa/mainline/ (see also https://wiki.ubuntu.com/KernelTeam/MainlineBuilds). If this has been fixed upstream at all, it should work with the latest drm-intel-next kernel.

[Vikram Dhillon (dhillon-v10)]

This issue was reported against karmic, so can you confirm if this issue exists with the most recent Lucid Lynx 10.04 Alpha release? ISO CD images are available at http://cdimage.ubuntu.com/releases/lucid/ . Thanks in advance.

[Bryce Harrington (bryce)]

We're closing this bug since it is has been some time with no response from the original reporter. However, if the issue still exists please feel free to reopen with the requested information. Also, if you could, please test against the latest development version of Ubuntu, since this confirms the bug is one we may be able to pass upstream for help.