[Bug 115291] New: system freeze on loading radeon module

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=115291

            Bug ID: 115291
           Summary: system freeze on loading radeon module
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.5
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: duemig at posteo.de
        Regression: No

Created attachment 210741
  --> https://bugzilla.kernel.org/attachment.cgi?id=210741&action=edit
kernel log captured via netconsole

system freezes when radeon module is loaded:
1. screen goes black
2. I can hear the harddrive spin down
3. no reaction on key presses like Ctrl+Alt+Del
4. the graphics card's fans halt immediately and do not start again until the
reset button is pressed
5. no kernel panic or error messages in kernel log captured via netconsole


$ lspci
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Curacao PRO [Radeon R7 370 / R9 270/370 OEM] (rev 81)

The graphics card works with VESA or fglrx drivers, as well as on windows, so
the hardware has to be alright.

Steps to freeze the system:
1. start system with radeon module blacklisted
2. stop graphical login manager
3. log into the console and manually load radeon module (# modprobe radeon)


I copy my bug report from the Arch Linux bugtracker [1] here, since I
encountered it on multiple distributions (Arch Linux, Ubuntu) and on the 4.5
vanilla sources as well.

[1] https://bugs.archlinux.org/task/48578

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