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Thread: UIbunut 10.4 with ATi in a Lenovo T60

  1. #1
    Join Date
    Nov 2007
    Beans
    75

    UIbunut 10.4 with ATi in a Lenovo T60

    Hello, I've looked for this problem all over the forum and google. I have yet to find a solution or anyone else with this problem.

    I was running 9.10 and my dual monitors worked find. After upgrading (fresh install) my second monitor now flickers. I can see what is on the screen but after some time have to look away due to the flickering. I've changed the "Refresh rate" and still no luck. Looks like I'll have to stay on 9.10...

    please help

  2. #2
    Join Date
    Mar 2006
    Beans
    81

    Re: UIbunut 10.4 with ATi in a Lenovo T60

    boot your 9.10, open a terminal with active second monitor and excute:
    xrandr

    it shows the current mode setting for the second monitor with a "*" behind. Is this mode setting available with xrandr on 10.4 install? Then use it with eg.
    xrandr --output DVI-0 --mode 800x600 --auto

    Or is the old mode not available? Error messages?

  3. #3
    Join Date
    May 2010
    Beans
    2

    Re: Ubuntu 10.4 with ATi in a Lenovo T60

    Same problem here

    External monitor "shivers" and complains about bad input "Try 1600x1200 60Hz" which is exactly what System->Preferences->Monitor shows.

    Have to turn off the external screen to be able to use the laptop at all. If it's on then after a couple of minutes both screens start blinking and I have to reboot.

    Saw something about a fix here: http://git.kernel.org/?p=linux/kerne...0f769b22f46105 so I tried using "pre-released updates" (lucid-proposed) to see if the update was there and made any difference. No luck.

    Feel like an utter idiot for upgrading, everything was perfect on 9.10.

    Code:
    $lspci | grep VGA
    01:00.0 VGA compatible controller: ATI Technologies Inc Radeon Mobility X1400
    
    $ xrandr
    Screen 0: minimum 320 x 200, current 3000 x 1200, maximum 8192 x 8192
    VGA-0 connected 1600x1200+1400+0 (normal left inverted right x axis y axis) 408mm x 306mm
       1600x1200      60.0*+
       1280x1024      75.0     60.0  
       1280x960       60.0  
       1152x864       75.0  
       1024x768       75.1     70.1     60.0  
       832x624        74.6  
       800x600        72.2     75.0     60.3     56.2  
       640x480        72.8     75.0     66.7     60.0  
       720x400        70.1  
    LVDS connected 1400x1050+0+0 (normal left inverted right x axis y axis) 286mm x 214mm
       1400x1050      60.0*+   50.0  
       1280x1024      59.9     60.0  
       1280x960       59.9  
       1280x854       59.9  
       1280x800       59.8  
       1280x720       59.9  
       1152x768       59.8  
       1024x768       60.0     59.9  
       800x600        60.3     59.9  
       848x480        59.7  
       720x480        59.7  
       640x480        60.0     59.4  
    DVI-0 disconnected (normal left inverted right x axis y axis)
    Let's go guys!
    Last edited by atlithorn; May 3rd, 2010 at 04:43 PM. Reason: clarity

  4. #4
    Join Date
    Mar 2006
    Beans
    81

    Re: Ubuntu 10.4 with ATi in a Lenovo T60

    seems a kms bug. you could use the old user mode setting with "nomodeset" or "radeon.modeset=0" as kernel parameter. powermanagment works also with ums. or use mainline-ppa kernel 2.6.34-rc6 (which has the fix)
    http://kernel.ubuntu.com/~kernel-ppa/mainline/

  5. #5
    Join Date
    May 2010
    Beans
    2

    Re: UIbunut 10.4 with ATi in a Lenovo T60

    Thanks antiram, that did the trick.

    In case you don't understand his suggestion:

    You need to edit your kernel parameters.

    Code:
    $sudo nano /boot/grub/menu.lst
    Find the default boot option (most likely the top option)
    edit the kernel line to read:


    Code:
    kernel        /boot/vmlinuz-2.6.32-22-generic root=UUID=b7d1fda9-dc35-4e0e-b0fb-e287929151c6 ro  radeon.modeset=0 quiet splash
    Notice radeon.modeset=0, that's the trick.

    Reboot and enjoy,
    Thanks again antiram.

  6. #6
    Join Date
    Mar 2007
    Location
    Beijing, China
    Beans
    6
    Distro
    Ubuntu Karmic Koala (testing)

    Re: UIbunut 10.4 with ATi in a Lenovo T60

    For those using the default Grub2 present in Ubuntu since 2 releases ago (IIRC) the file to edit is /etc/default/grub and you need to add the kernel parameter to the GRUB_CMDLINE_LINUX_DEFAULT="quiet splash".

    Then just sudo update-grub and restart for the changes to take effect.

  7. #7
    Join Date
    Jan 2008
    Location
    indonesia
    Beans
    5
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: UIbunut 10.4 with ATi in a Lenovo T60

    Quote Originally Posted by atlithorn View Post
    Thanks antiram, that did the trick.

    In case you don't understand his suggestion:

    You need to edit your kernel parameters.

    Code:
    $sudo nano /boot/grub/menu.lst
    Find the default boot option (most likely the top option)
    edit the kernel line to read:


    Code:
    kernel        /boot/vmlinuz-2.6.32-22-generic root=UUID=b7d1fda9-dc35-4e0e-b0fb-e287929151c6 ro  radeon.modeset=0 quiet splash
    Notice radeon.modeset=0, that's the trick.

    Reboot and enjoy,
    Thanks again antiram.
    is it possible for Intel Mobile 945GM ??

  8. #8
    Join Date
    Mar 2008
    Beans
    23
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: UIbunut 10.4 with ATi in a Lenovo T60

    Thank you antiram, atlithorn and Haitao!

    Your posts helped me with a flickering dual-monitor on an LG E300 laptop with an ATI Radeon Xpress 1250 graphic card running Ubuntu 10.4 Lucid Lynx.

    Thanks again,
    dror

  9. #9
    Join Date
    Jun 2008
    Location
    Ottawa, Canada
    Beans
    76
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: UIbunut 10.4 with ATi in a Lenovo T60

    Yes!!
    To clarify for non-hackers,
    GRUB_CMDLINE_LINUX_DEFAULT="radeon.modeset=0 quiet splash"
    Last edited by ecowan; September 21st, 2010 at 02:41 AM.

  10. #10
    Join Date
    Jun 2009
    Beans
    7

    Re: UIbunut 10.4 with ATi in a Lenovo T60

    solved
    Last edited by Charbax; October 11th, 2010 at 02:09 PM.

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