Ubuntu can't identify correct resolution

Asked by KushalSharma on 2012-04-02

I had a Dell monitor and now I have an AOC monitor. The last time these worked without any Xrandr tweaking were with Ubuntu 10.10. Since 11.04, the max resolution that I can use on these is 1024x768.

The correct resolution on this monitor should be 1360x768. Even with Precise beta 2, this problem persists. I know I can fix it using Xrandr, but I want to understand how to get Ubuntu to identify the correct possible resolutions on its own the way it did two years ago. Can someone help me?

Thanks in advance for all your help.

Can you give the output of:

sudo lshw -C display

thanks

KushalSharma (kushalsharma83) said : #2

Thanks for the quick reply. Here's the output of that command:

  *-display:0
       description: VGA compatible controller
       product: Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 03
       width: 32 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:16 memory:d0200000-d027ffff ioport:1800(size=8) memory:c0000000-cfffffff memory:d0300000-d033ffff
  *-display:1 UNCLAIMED
       description: Display controller
       product: Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2.1
       bus info: pci@0000:00:02.1
       version: 03
       width: 32 bits
       clock: 33MHz
       capabilities: pm bus_master cap_list
       configuration: latency=0
       resources: memory:d0280000-d02fffff

KushalSharma (kushalsharma83) said : #3

Thanks for the quick reply. Here's the output of that command:

   *-display:0
        description: VGA compatible controller
        product: Mobile 945GM/GMS, 943/940GML Express Integrated
Graphics Controller
        vendor: Intel Corporation
        physical id: 2
        bus info: pci@0000:00:02.0
        version: 03
        width: 32 bits
        clock: 33MHz
        capabilities: msi pm vga_controller bus_master cap_list rom
        configuration: driver=i915 latency=0
        resources: irq:16 memory:d0200000-d027ffff ioport:1800(size=8)
memory:c0000000-cfffffff memory:d0300000-d033ffff
   *-display:1 UNCLAIMED
        description: Display controller
        product: Mobile 945GM/GMS/GME, 943/940GML Express Integrated
Graphics Controller
        vendor: Intel Corporation
        physical id: 2.1
        bus info: pci@0000:00:02.1
        version: 03
        width: 32 bits
        clock: 33MHz
        capabilities: pm bus_master cap_list
        configuration: latency=0
        resources: memory:d0280000-d02fffff

On 12-04-02 02:35 AM, actionparsnip wrote:
> Your question #192380 on Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+question/192380
>
> Status: Open => Needs information
>
> actionparsnip requested more information:
> Can you give the output of:
>
> sudo lshw -C display
>
> thanks
>

KushalSharma (kushalsharma83) said : #4

Just FYI: I had the AOC monitor hooked up to the laptop when running that command.

Thanks again

ok and the output of:

lsb_release -a; uname -a

Thanks

KushalSharma (kushalsharma83) said : #6

Thanks again for your reply.

Here is the output of the commands:

kushal@kushal-3000-N100-laptop:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu precise (development branch)
Release: 12.04
Codename: precise
kushal@kushal-3000-N100-laptop:~$ uname -a
Linux kushal-3000-N100-laptop 3.2.0-21-generic-pae #34-Ubuntu SMP Thu
Mar 29 22:33:16 UTC 2012 i686 i686 i386 GNU/Linux

On 12-04-02 03:41 AM, actionparsnip wrote:
> Your question #192380 on Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+question/192380
>
> Status: Open => Needs information
>
> actionparsnip requested more information:
> ok and the output of:
>
> lsb_release -a; uname -a
>
> Thanks
>

I suggest you report a bug then

José Antonio Rey (jose) said : #8

I think this is a common problem with Intel Chipsets. I suggest you check this FAQ:
FAQ #1901: “Intel Chipsets Screen Resolution Problem”.

KushalSharma (kushalsharma83) said : #9

Thanks a lot for pointing me to this solution.

The first step says: 1.- Search the values of HorizSync and VertRefresh of your monitor.

How do I do that?

Furthermore, do I have to follow this step every time I connect a new monitor (a different one from what I have at home)?

If so, what do I do to get this bug filed correctly, so that with the next update or in future versions, this issue with Intel chipsets gets resolved.

Mancy (mancy) said : #10

I also have the same bug with same log as KushalSharma, eveything works correctly on Ubuntu 2D session but not in Ubuntu 3D or what so called.

Mancy (mancy) said : #11

i tried to fix it manually using xrandr but when i set the correct size/mode and rotation i see only white screen, only the task-bar does appear and if i clicked an item on the task-bar it refreshes very heavily , then i had to unplug the BraviaTV to get the screen restored.

setting the size/mode on Ubuntu 2D does work

Mancy (mancy) said : #12

the user Wannabegeek reported that in ubuntu 11.10 this issue doesn't occurs on the same hardware,
so the issue appears to be with the new driver in ubuntu 12.04

here is the link for his testing result
http://ubuntuforums.org/showthread.php?t=1879717

Can you help with this problem?

Provide an answer of your own, or ask KushalSharma for more information if necessary.

To post a message you must log in.