[Bug 84974] New: [i915 xrandr] Screen goes blank on rotate

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84974

            Bug ID: 84974
           Summary: [i915 xrandr] Screen goes blank on rotate
           Product: DRI
           Version: XOrg CVS
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: ws at xell.at
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Bug description:

When rotating the screen to the left or right using e.g. "xrandr -o left", it
goes blank.

I am no longer able to use Ctrl+Alt+F<n> for switching to a console, but the
machine is still reachable over network. It also does not switch back when
calling a shell command like "xrandr -o left; sleep 10; xrandr -o normal".
"xrandr -o inverted" works as expected, but calling "xrandr -o normal"
afterwards also causes the screen to go blank.

The monitor is connected through LVDS, I was not able to configure the machine
to deliver any output on DP/HDMI/DVI despite trying all BIOS options.

I use Debian Jessie, but quick check with some live cds revealed, that also
Fedora and Ubuntu are affected when the kernel version matches.

Bisect revealed that first commit which showed this behaviour is:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=77961eb984c7e5394bd29cc7be2ab0bf0cc7e7b1
It is still present in today's mainline kernel.

System environment:

-- chipset: i915 I guess (the one included in Intel Atom E3825)
-- system architecture: x86_64
package versions (all from debian jessie):
-- libdrm version: 2.4.56-1
-- xserver-xorg-video-intel (from debian jessie): 2:2.21.15-2+b2
-- xserver-xorg version: (from debian jessie): 1:7.7+7

-- Kernel version: Since 77961eb984c7e5394bd29cc7be2ab0bf0cc7e7b1 at least
until today's mainline (dfe2c6dcc8ca2cdc662d7c0473e9811b72ef3370)
-- Machine model: Can't tell details about the product, but it contains an
Intel Atom E3825 CPU and is quite standard apart from that. See attached
cpuinfo and lspci for the details.
-- Display connector: LVDS

Please let me know if you need any further information.

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