[Nouveau] [Bug 93932] New: Xorg/Nouveau crashes with Segmentation fault when setting i7-Skylake iGPU as primary grapics device in BIOS

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93932

            Bug ID: 93932
           Summary: Xorg/Nouveau crashes with Segmentation fault when
                    setting i7-Skylake iGPU as primary grapics device in
                    BIOS
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: m.prechtl97 at googlemail.com
        QA Contact: xorg-team at lists.x.org

Created attachment 121404
  --> https://bugs.freedesktop.org/attachment.cgi?id=121404&action=edit
Apport crash dump

Xorg/Nouveau crashes with Segmentation fault when setting i7-Skylake iGPU as
primary grapics device in BIOS

Hardware:
CPU: i7-6700k (Intel HD Graphics 530)
MB: Asus H110M2 D3
GPU: NVIDIA GeForce GTX 750ti

How to reproduce:
- Install fresh Ubuntu Gnome 15.10 (Side note, graphic issues with standard
drivers, goes away with NVIDIA drivers so no big problem there)
- Install Kernel 4.3.4
- Install Intel drivers / compile and install latest Intel drivers
- Reboot
- iGPU isn't recognized as VGA compatible card
- Reboot and set primary graphics device to 'CPU Graphics' in BIOS
--> iGPU now is recognized
--> Xorg lives for approx. 1-2 seconds and then crashes

Xorg Version: X.Org X Server 1.17.2

Excerpt from error log:

[     9.322] (EE) 
[     9.322] (EE) Backtrace:
[     9.322] (EE) 0: /usr/bin/X (xorg_backtrace+0x4e) [0x56165770c68e]
[     9.322] (EE) 1: /usr/bin/X (0x561657558000+0x1b89f9) [0x5616577109f9]
[     9.323] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7f40fc83e000+0x352f0)
[0x7f40fc8732f0]
[     9.323] (EE) 3: /usr/lib/xorg/modules/drivers/nouveau_drv.so
(0x7f40f87bd000+0xd74f) [0x7f40f87ca74f]
[     9.323] (EE) 4: /usr/bin/X (PixmapShareToSlave+0x8e) [0x5616575cc94e]
[     9.323] (EE) 5: /usr/bin/X (RRCrtcSet+0x670) [0x561657671870]
[     9.323] (EE) 6: /usr/bin/X (ProcRRSetCrtcConfig+0x38b) [0x56165767289b]
[     9.323] (EE) 7: /usr/bin/X (0x561657558000+0x5818f) [0x5616575b018f]
[     9.323] (EE) 8: /usr/bin/X (0x561657558000+0x5c34b) [0x5616575b434b]
[     9.323] (EE) 9: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf0)
[0x7f40fc85ea40]
[     9.323] (EE) 10: /usr/bin/X (_start+0x29) [0x56165759e6c9]
[     9.323] (EE) 
[     9.323] (EE) Segmentation fault at address 0x8
[     9.323] (EE) 
Fatal server error:
[     9.323] (EE) Caught signal 11 (Segmentation fault). Server aborting
[     9.323] (EE) 
[     9.323] (EE)

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