Ubuntu
xserver-xorg-video-ati package

Screen with 4:3 ratio incorrectly detected as having 16:9 ratio

Bug #641525 reported by Bruno Girin on 2010-09-17

This bug affects 6 people

Affects		Status	Importance	Assigned to	Milestone
	xserver-xorg-video-ati (Ubuntu)	Expired	Undecided	Unassigned

Bug Description

Binary package hint: xorg

Following an update a few days ago, my laptop's screen is detected as having a 16:9 ratio rather than a 4:3 ratio and the display is set to 1360x768 pixels rather than 1024x768. As a result, the GDM login box is shifted to the right and, once logged in, the screen extends to the right making some elements of the desktop displayed outside the physical screen area. This can be corrected on a per-user basis by setting the resolution manually in System → Preferences → Monitors but doesn't correct the login screen. See the attached photograph for an illustration.

Steps to reproduce:
1. Boot Ubuntu 10.10 on a computer with a screen that has a physical 4:3 ratio (1024x768 in my case).
2. The boot screen is displayed with a 4:3 ratio
3. The login screen appears and is displayed with a resolution of 1360x768 pixels (16:9 ratio, login box shifted to the right)
4. Log-in
5. The desktop is displayed with a resolution of 1360x768 pixels resulting in 336 pixels (1360-1024) worth of screen real estate displayed outside the screen boundary to the right

Expected behaviour:
In steps 3 and 5, the login screen and the desktop should be displayed with resolution that has a 4:3 ratio, as per the physical ratio of the screen.

Workaround:
Once logged in, go to System → Preferences → Monitors and select a resolution that fits the physical screen. However, this needs to be done for every user on the system.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: xorg 1:7.5+6ubuntu3
ProcVersionSignature: Ubuntu 2.6.35-22.32-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic i686
Architecture: i386
DRM.card0.DVI.D.1:
status: disconnected
enabled: disabled
dpms: Off
modes:
edid-base64:
DRM.card0.LVDS.1:
status: connected
enabled: enabled
dpms: On
modes: 1024x768 800x600 848x480 720x480 640x480
edid-base64:
DRM.card0.VGA.1:
status: disconnected
enabled: disabled
dpms: Off
modes:
edid-base64:
Date: Fri Sep 17 19:01:11 2010
DkmsStatus:
virtualbox-ose, 3.2.8, 2.6.35-22-generic, i686: installed
virtualbox-ose, 3.2.8, 2.6.35-21-generic, i686: installed
virtualbox-ose, 3.2.8, 2.6.35-20-generic, i686: installed
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Beta i386 (20100406.1)
Lsusb:
Bus 004 Device 002: ID 0483:2016 SGS Thomson Microelectronics Fingerprint Reader
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
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: IBM 2373F2G
PccardctlIdent:
Socket 0:
   no product info available
Socket 1:
   no product info available
PccardctlStatus:
Socket 0:
   no card
Socket 1:
   no card
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-22-generic root=UUID=c86343a6-8c93-482f-8875-d61d789d323e ro quiet splash
ProcEnviron:
PATH=(custom, user)
LANG=en_GB.utf8
SHELL=/bin/bash
SourcePackage: xorg
dmi.bios.date: 06/18/2007
dmi.bios.vendor: IBM
dmi.bios.version: 1RETDRWW (3.23 )
dmi.board.name: 2373F2G
dmi.board.vendor: IBM
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: IBM
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnIBM:bvr1RETDRWW(3.23):bd06/18/2007:svnIBM:pn2373F2G:pvrThinkPadT42:rvnIBM:rn2373F2G:rvrNotAvailable:cvnIBM:ct10:cvrNotAvailable:
dmi.product.name: 2373F2G
dmi.product.version: ThinkPad T42
dmi.sys.vendor: IBM
glxinfo: Error: [Errno 2] No such file or directory
system:
distro: Ubuntu
codename: maverick
architecture: i686
kernel: 2.6.35-22-generic

Tags:

Revision history for this message

Bruno Girin (brunogirin) wrote on 2010-09-17:

BootDmesg.txt Edit (49.5 KiB, text/plain; charset="utf-8")
CurrentDmesg.txt Edit (2.8 KiB, text/plain; charset="utf-8")
DRM.card0.SVIDEO.1.txt Edit (108 bytes, text/plain; charset="utf-8")
Dependencies.txt Edit (5.2 KiB, text/plain; charset="utf-8")
GdmLog.txt Edit (33.0 KiB, text/plain; charset="utf-8")
GdmLog1.txt Edit (33.9 KiB, text/plain; charset="utf-8")
GdmLog2.txt Edit (33.1 KiB, text/plain; charset="utf-8")
Lspci.txt Edit (10.8 KiB, text/plain; charset="utf-8")
PciDisplay.txt Edit (822 bytes, text/plain; charset="utf-8")
ProcCpuinfo.txt Edit (529 bytes, text/plain; charset="utf-8")
ProcInterrupts.txt Edit (1.2 KiB, text/plain; charset="utf-8")
ProcModules.txt Edit (2.5 KiB, text/plain; charset="utf-8")
RelatedPackageVersions.txt Edit (242 bytes, text/plain; charset="utf-8")
UdevDb.txt Edit (89.6 KiB, text/plain; charset="utf-8")
UdevLog.txt Edit (216.4 KiB, text/plain; charset="utf-8")
XorgLog.txt Edit (42.7 KiB, text/plain; charset="utf-8")
XorgLogOld.txt Edit (44.1 KiB, text/plain; charset="utf-8")
Xrandr.txt Edit (3.4 KiB, text/plain; charset="utf-8")
monitors.xml.txt Edit (1.3 KiB, text/plain; charset="utf-8")
peripherals.txt Edit (1.6 KiB, text/plain; charset="utf-8")
setxkbmap.txt Edit (306 bytes, text/plain; charset="utf-8")
xdpyinfo.txt Edit (17.3 KiB, text/plain; charset="utf-8")
xkbcomp.txt Edit (64.9 KiB, text/plain; charset="utf-8")

Revision history for this message

Bruno Girin (brunogirin) wrote on 2010-09-17:

ubuntu-screen-ratio-bug.JPG Edit (114.7 KiB, image/jpeg)

Photograph of login screen demonstrating the bug.

Bryce Harrington (bryce) on 2010-09-18

affects:

xorg (Ubuntu) → xserver-xorg-video-ati (Ubuntu)

Revision history for this message

Alvaro Pintos Pena (alvarop) wrote on 2010-09-21:

I have a nvidia card with nouveau driver and I have this problem too

Revision history for this message

sh4wn (sh4wn) wrote on 2010-09-22:

The same for me with nvidia proprietary driver, with the only difference that everything is shifted to the left.

Revision history for this message

Sebastian Łuczak (sebastian-m-luczak) wrote on 2010-09-23:

xrandr log Edit (623 bytes, text/plain)

Same bug here. IBM T40 with ATI RADEON MOBILITY 7500 using radeon driver. Screen looks garbled and unusable in GDM, workaround with manual setting of resolution to 1024x768 in Gnome solves the problem for user (not for global GDM settings). Disabling modesetting with "options radeon modeset=1" in /etc/modprobe.d/radeon-kms.conf solves the problem, but performance drops to unusable level. Changes to xorg.conf forcing modelines doesn't solve problem, Ubuntu still recognizes screen as 16:9.

Revision history for this message

Alvaro Pintos Pena (alvarop) wrote on 2010-09-23:

This is the solution:

http://ubuntuforums.org/showpost.php?p=9878880&postcount=5

Illogic_Gate (illogicgate) on 2010-09-30

Changed in xserver-xorg-video-ati (Ubuntu):
status:	New → Confirmed

Revision history for this message

Illogic_Gate (illogicgate) wrote on 2010-09-30:

Alvaro, your solution does solve the symptoms (thanks!!), but a peek at my xrandr output leads me to believe that the underlying problem may not be gone.

$ xrandr
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 4096 x 4096
VGA-0 disconnected (normal left inverted right x axis y axis)
DVI-0 disconnected (normal left inverted right x axis y axis)
LVDS connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1024x768 60.0*+ 60.0
   1360x768 59.8
   800x600 60.3 59.9
   848x480 59.7
   720x480 59.7
   640x480 59.9 59.4
S-video disconnected (normal left inverted right x axis y axis)

It's still detecting my 1024x768 laptop display as 1360x768 CAPABLE which is quite incorrect. I'm using a T42 Thinkpad with the M7 (Radeon Mobility 7500)

Thanks for your solution and any additional consideration to this issue!

Revision history for this message

Tormod Volden (tormodvolden) wrote on 2010-10-02:

This is related to bug 640807, which explains why it showed up a few days ago. Also, the DRM.card0.LVDS.1 modes list in the apport-collected summary does not list the faulty 1360x768 mode, but it shows up in the xrandr output. I suspected g-s-d for this in another report, but since the mode can be seen listed in Xorg.0.log in early initialization this must be an xorg bug.

g-s-d will be fixed so it does not overrule the X server mode selection, so the reported problem will go away. However the bug in xorg which generates the faulty mode should also be fixed to avoid other problems.

Revision history for this message

bugbot (bugbot) wrote on 2011-02-19:

Hey Bruno,

Thanks for testing maverick during its development period. Unfortunately it looks like this bug report didn't get attention during the maverick development period. But I see there's not been more comments on the bug since the release, which makes me wonder if this is still an issue for you?

If you've not seen this issue since maverick's release yourself, it may have been solved by kernel or X or other updates that occurred late in the release; if so, would you mind please closing the bug for us? Go to the URL mentioned in this bug report, click the yellow icon(s) in the status column and set to 'Fix Released'.

If you no longer have the hardware needed to reproduce the problem, or otherwise feel the bug no longer needs tracked in Launchpad, you can set the status to 'Invalid'.

If you are the original reporter and still have this issue, just reply to this email saying so. (Or set the bug status to Confirmed.) If you are able to re-test this against 11.04 Natty Narwhal (our current development focus) and find the issue still affects Natty, please also run 'apport-collect <bug-number>' while running natty, which will add fresh logs and debug data, and flag it for the Ubuntu-X development team to look at.

Changed in xserver-xorg-video-ati (Ubuntu):
status:	Confirmed → Incomplete

Revision history for this message

bugbot (bugbot) wrote on 2011-03-11:

#10

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.

Changed in xserver-xorg-video-ati (Ubuntu):
status:	Incomplete → Expired

Revision history for this message

Tormod Volden (tormodvolden) wrote on 2011-03-31:

#11

MrMacman2u, can you please file a new bug for the issue in comment 7?

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Ubuntuxserver-xorg-video-ati package

Screen with 4:3 ratio incorrectly detected as having 16:9 ratio

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Ubuntu
xserver-xorg-video-ati package