[Bug 107324] Radeon driver fails to install with modprobe: ERROR: could not insert 'radeon': Invalid argument

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107324

            Bug ID: 107324
           Summary: Radeon driver fails to install with modprobe: ERROR:
                    could not insert 'radeon': Invalid argument
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: jamesstewartmiller at gmail.com

Hi, on the following:
Advanced Micro Devices, Inc. [AMD/ATI] RV770/M98L [Mobility Radeon HD 4850]
 on a 2009 imac running kubuntu 18.04 and kde 16.04 and kernel:
4.15.0-29-generic
I'm having no luck obtaining anything but the vesa driver.
The addition of nomodeset to the kernel parameters (booting from refind with no
grub) is necessary to get a graphical desktop.  If I leave modesetting on, the
screen blacks out as the mode is changed.  If I turn it off I get the vesa but
an error is reported that there is no ums available in the radeon module.
This has occurred on kde neon clean install and kubuntu.

Many thanks.

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