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Currently the problems are: 1. can only log in with recovery mode / nouveau, 2. poor screen resolution, and 3. screen display shows "built in display" only.

My graphics card is: 1024Mb ATi Radeon HD 5770 PCI-Express VGA Card. It was working fine before moving from 14.04 to 16.04 yesterday.

I have an Intel CPU and I believe I am using the open source radeon driver.

Please, could someone tell me how to get the graphics card working again?

When I run this command: dmesg | egrep 'drm|radeon'

I get this response: 

[    1.536906] [drm] Initialized drm 1.1.0 20060810
[    1.586158] [drm] VGACON disable radeon kernel modesetting.
[    1.586239] [drm:radeon_init [radeon]] *ERROR* No UMS support in radeon module!
[   44.543359] [drm] VGACON disable radeon kernel modesetting.
[   44.543388] [drm:radeon_init [radeon]] *ERROR* No UMS support in radeon module!

When I enter lshw -c video

I get: 

  *-display UNCLAIMED     
       description: VGA compatible controller
       product: Juniper XT [Radeon HD 5770]
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]
       physical id: 0
       bus info: pci@0000:01:00.0
       version: 00
       width: 64 bits
       clock: 33MHz
       capabilities: pm pciexpress msi vga_controller bus_master cap_list
       configuration: latency=0
       resources: memory:e0000000-efffffff memory:fbdc0000-fbddffff ioport:ee00(size=256) memory:fbd00000-fbd1ffff

The output of sudo cat /etc/default/grub can be seen here http://paste.ubuntu.com/22074912/

screenshot

Chris Poole
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1 Answers1

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To start with, let's make sure you have a AMD CPU. Run this in a terminal:

cat /proc/cpuinfo  | grep 'name'| uniq

If this shows AMD, then you need to correct the drivers.

To get the correct drivers, first, select "Do not use this device" option. Then, from a terminal, run:

sudo apt-get remove intel-microcode iucode-tool

Now, run:

sudo apt-get install amd64-microcode

Then, go again to the "Additional Drivers" tab, and select proprietary option.

NOTE: In case you are not aware, proprietary driver for AMD graphic cards (fglrx) are not longer supported in Ubuntu 16.04. Open-source drivers are then used by default. That is why you do not see any propeietary driver in that window, as you probably saw in your previous Ubuntu (14.04?). See here and here for more information.

Community
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  • Hi @luchonacho , thanks for your response!

    I have an intel CPU, here's the output of 'cat /proc/cpuinfo | grep 'name'| uniq':

    'Intel(R) Core(TM) i5 CPU 750 @ 2.67GHz'

    What should I do to ensure I have the correct drivers for my Radeon graphics card?

    Currently the problems are: 1. can only log in with recovery mode, 2. poor screen resolution, and 3. screen display shows "built in display" only.

     – Chris Poole Aug 03 '16 at 19:08
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    Aha! So then, there is nothing wrong with that additional drivers bit! You probably have the correct drivers already, by default. If this is true, you have a different problem. To confirm, please add the output of lshw -c video to your question. (To format as code, select text and press Ctrl+K) –  Aug 03 '16 at 19:29
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    Ok, drivers are fine. There is another problem. Look into your /etc/default/grub file, and look for the word nomodeset. Delete that. Then save, run sudo update-grub from a terminal, and restart. –  Aug 03 '16 at 19:49
  • Hi, I tried to do this. There was no mention of the word nomodeset in my /etc/default/grub file unfortunately. So I tried running sudo update-grub anyway, and restarting, but alas the exact same problem remains.

    What do you think the problem could be? Thanks.

     – Chris Poole Aug 03 '16 at 20:04
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    Mmm, can you add the output of sudo cat /etc/default/grub to your question? To avoid adding too much test, copy your text here and add the link only. –  Aug 03 '16 at 20:07
  • Hi @luchonacho , I've pasted the file contents. If I have the correct drivers, should I update the title of the question? Any suggestions for this? – Chris Poole Aug 03 '16 at 20:36