[Bug 94153] Unresponsive system on boot with radeon + HD 3870

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94153

            Bug ID: 94153
           Summary: Unresponsive system on boot with radeon + HD 3870
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: blocker
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: g47qk at ukr.net

Created attachment 121755
  --> https://bugs.freedesktop.org/attachment.cgi?id=121755&action=edit
dmesg.log saved via the serial port

I'm using a HD 3870 with Debian 9 Stretch x64 (Testing). When booting to a
command line, when drivers are loaded, the screen goes into power saving mode,
and the system becomes unresponsive.

Booting with `nomodeset' works OK. If I run "#modprobe radeon modeset=1", the
screen goes power saving mode, the system stops responding and the caps lock
key no longer works (kernel panic?).

I've also tested with a Fedora 23 Workstation Live-CD (64-bit), Ubuntu 15.10
Desktop (64-bit) Live-CD, SystemRescueCd-x86-4.7.0 with the same results
(unresponsive on driver load).

I've tested a ATI X1600 Pro in the same system, and everything works fine.

#lspci -nnn | grep VGA
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] RV670 [Radeon HD 3870] [1002:9501]

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