[Bug 60523] Radeon DPM not working with 2 monitors attached to Radeon HD5770 (Juniper)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=60523

Alex Belykh <albel727 at ngs.ru> changed:

           What    |Removed                     |Added
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                 CC|                            |albel727 at ngs.ru

--- Comment #46 from Alex Belykh <albel727 at ngs.ru> ---
Created attachment 124101
  --> https://bugzilla.kernel.org/attachment.cgi?id=124101&action=edit
output of lspci -vv

I experience similar issue with HD4730, although lockup is rather unavoidable
than "hard to trigger".

Booting with radeon.dpm=1 and two monitors attached results in periodic (every
15-45 sec) lockups (for ~7-15 sec), until one of them results in a reboot (most
of the time during bootup, before even X is started).

radeon.dpm=0 seems to boot up and work fine (although I think I had
unexplainable loud fan spinups after some time, need to test that further).

Bisecting kernel didn't yield anything useful. It just pointed me at
66229b200598a3b66b839d1759ff3f5b17ac5639 "drm/radeon/kms: add dpm support for
rv7xx (v4)".

Latest drm-next kernel (commit ef64cf9d06049e4e9df661f3be60b217e476bee1) didn't
help either.

The abovementioned patch for fixing arrays' size applied over 66229b2 didn't
alleviate the problem in the slightest (gcc 4.7.3 though).

Funnily enough, if I boot with either of monitors detached, it boots and works
fine, and if I then reattach the second monitor and connect it with xrandr,
everything keeps working fine. Disconnecting a monitor every time one needs to
reboot is a drag, though.

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