[Bug 98751] New: radeon: multihead "no signal" on one of the monitors - regression

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=98751

            Bug ID: 98751
           Summary: radeon: multihead "no signal" on one of the monitors -
                    regression
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.0.3+
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: mikkeloscar at gmail.com
        Regression: No

Since this commit:
https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=d5c3b64
one of my two monitors doesn't get a signal (it just says "no signal").

The monitors are connected to a Radeon HD 6990 card. One is connected through
HDMI and one through DVI. I'm using the radeon driver.

Most of the time it is the monitor connected through HDMI which doesn't get a
signal, but I was able to switch it around somehow by messing around with
screen orientation in X (not quite sure how to replicate or if it's even
relevant).

I tried to revert the commit in kernel 4.0.4 (latest I tried) and that solves
the problem for me.

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