[Bug 76286] New: Kernel v3.13 hang during boot now that dpm is enabled for radeon driver - Radeon HD4870

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76286

          Priority: medium
            Bug ID: 76286
          Assignee: dri-devel at lists.freedesktop.org
           Summary: Kernel v3.13 hang during boot now that dpm is enabled
                    for radeon driver - Radeon HD4870
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: OmegaPhil+FreeDesktop.BugTracker at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Radeon
           Product: DRI

Created attachment 95961
  --> https://bugs.freedesktop.org/attachment.cgi?id=95961&action=edit
Kernel log for session with manual radeon module loading with modesetting
enabled

Flagged as major as this prevents kernel boot if the user doesnt know how to
disable the functionality with the kernel boot parameters.

Originally reported in https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=741619
, Debian kernel v3.13 enables dpm by default - partway through the boot process
(when cryptsetup is opening encrypted disks), the kernel hangs (confirmed with
no response to ping).

The kernel boots fine with radeon.dpm=0.

Following instructions
(https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=741485#10) I booted with
radeon.modeset=0, made sure X wasn't running and radeon was unloaded, then
modprobe'd radeon modeset=1 - after a small delay everything hung.

I have attached kern.log (REISUB FTW this time it seems?), there is an X log
but that simply gave up after finding no modesetting support, before the point
where I reloaded radeon.

kern.log is verbose as I always boot with full debugging information, but in
this case its useless as nothing appears to be logged associated with the
radeon load (and I'm assuming the magic sync worked).

In terms of fighting the issue, I have C and C++ experience but no real kernel
debugging EXP and certainly nothing todo with the graphical stack.


===============================

uname -a: Linux omega1 3.13-1-amd64 #1 SMP Debian 3.13.5-1 (2014-03-04) x86_64
GNU/Linux
Debian Testing
X server: 1.15.0
Radeon: 7.3.0

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