[Bug 95401] New: [IVB bisected] assert_scanout:531 assertion 'width == info.width && height == info.height' failed

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95401

            Bug ID: 95401
           Summary: [IVB bisected] assert_scanout:531 assertion 'width ==
                    info.width && height == info.height' failed
           Product: xorg
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: chris.bainbridge at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

With normal compile, Xorg starts up but mouse and keyboard are unresponsive.
With enable-debug=full compile, Xorg fails to start up:

[  1632.814] (EE) 0: /usr/bin/X (xorg_backtrace+0x56) [0x55faada9ad46]
[  1632.814] (EE) 1: /usr/lib/xorg/modules/drivers/intel_drv.so
(0x7fe7834a2000+0xafd96) [0x7fe783551d96]
[  1632.814] (EE) 2: /usr/lib/xorg/modules/drivers/intel_drv.so
(0x7fe7834a2000+0xaffe4) [0x7fe783551fe4]
[  1632.814] (EE) 3: /usr/lib/xorg/modules/drivers/intel_drv.so
(0x7fe7834a2000+0xc9940) [0x7fe78356b940]
[  1632.814] (EE) 4: /usr/lib/xorg/modules/drivers/intel_drv.so
(0x7fe7834a2000+0xc826e) [0x7fe78356a26e]
[  1632.814] (EE) 5: /usr/lib/xorg/modules/drivers/intel_drv.so
(0x7fe7834a2000+0xcb2c6) [0x7fe78356d2c6]
[  1632.814] (EE) 6: /usr/lib/xorg/modules/drivers/intel_drv.so
(0x7fe7834a2000+0xce47c) [0x7fe78357047c]
[  1632.814] (EE) 7: /usr/bin/X (WakeupHandler+0xaa) [0x55faad94011a]
[  1632.815] (EE) 8: /usr/bin/X (WaitForSomething+0x1c3) [0x55faada97ff3]
[  1632.815] (EE) 9: /usr/bin/X (0x55faad8e4000+0x57211) [0x55faad93b211]
[  1632.815] (EE) 10: /usr/bin/X (0x55faad8e4000+0x5b596) [0x55faad93f596]
[  1632.815] (EE) 11: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf5)
[0x7fe787226b45]
[  1632.815] (EE) 12: /usr/bin/X (0x55faad8e4000+0x4590e) [0x55faad92990e]
[  1632.815] (EE) 
[  1632.815] (EE) 
Fatal server error:
[  1632.815] (EE) assert_scanout:531 assertion 'width == info.width && height
== info.height' failed


46caee86db0fb32b16213893c79d9c1a21ed0883 is the first bad commit
commit 46caee86db0fb32b16213893c79d9c1a21ed0883
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Wed Apr 20 21:37:35 2016 +0100

    sna: Fix reporting of errno after setcrtc failure

    As we now do more syscalls after the setcrtc, we cannot rely on errno
    storing the pertinent error code. Instead we have to save it immediately
    after the drmIoctl() and propagate that back.

    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

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