[Intel-gfx] black screen if sna & TearFree

[Grant]

>> 'xset dpms force off; sleep 1; xset dpms force on' does indeed trigger
>> the error.  I've attached my Xorg.0.log.old which includes the
>> segfault backtrace.  I'm like a newborn baby when it comes to
>> compiling and Gentoo doesn't have a debug USE flag for
>> xf86-video-intel or xorg-server so I can't help there.  Is there a
>> different package I should check for a debug USE flag?
>
> In the Xorg.log, the first error appears to be a failed modeset after
> resume:
>
> [  5131.319] (II) AIGLX: Resuming AIGLX clients after VT switch
> [  5131.319] (II) intel(0): switch to mode 1366x768 on crtc 3 (pipe 0)
> [  5131.319] (EE) intel(0): failed to set mode: Invalid argument
> [  5131.319] (WW) intel(0): failed to restore desired modes on VT switch
>
> That is going to leave the screens blank. And the subsequent segfault
> suggests that I don't have sufficient safeguards to handle that failure.
> Can you please run 'addr2line -e
> /usr/lib64/xorg/modules/drivers/intel_drv.so 0xb9ed7 0x68517 0x5aa2e' ?

I reproduced the segfault on my other (identical) laptop and got:

[ 10865.673] 3: /usr/lib64/xorg/modules/drivers/intel_drv.so
(0x7f5cf32f5000+0x39ba5) [0x7f5cf332eba5]
[ 10865.673] 4: /usr/lib64/xorg/modules/drivers/intel_drv.so
(0x7f5cf32f5000+0x47015) [0x7f5cf333c015]
[ 10865.673] 5: /usr/lib64/xorg/modules/drivers/intel_drv.so
(0x7f5cf32f5000+0x4bc29) [0x7f5cf3340c29]
[ 10865.673] 6: /usr/lib64/xorg/modules/drivers/intel_drv.so
(0x7f5cf32f5000+0x57708) [0x7f5cf334c708]

so I changed the command:

# addr2line -e /usr/lib64/xorg/modules/drivers/intel_drv.so 0x39ba5
0x47015 0x4bc29 0x57708
??:0
??:0
??:0
??:0
#

> To solve what happened to prevent the modeswitch we need to have the
> dmesg, preferrably with drm.debug=6 (echo 6 >
> /sys/modules/drm/parameters/debug).

I've attached kern.log since the segfault.  It looks like there's some
good stuff in there.

> Compiling a debug driver is pretty straightforward.
> $ git clone git://anongit.freedesktop.org/xorg/driver/xf86-video-intel
> $ cd xf86-video-intel
> $ ./autogen.sh --prefix=/usr --enable-debug=full
> $ make && sudo make install
>
> This will overwrite the system driver and so not need any modification
> to config files. (It is possible to install into local and change
> /etc/X11/xorg.conf to load the driver from there.) So just reinstall
> your distro package to revert.
> -Chris

If it's still necessary for me to do so, please tell me how to install
into a folder (/usr/local ?) that I can delete later to completely
wipe out the install.

Thanks,
Grant
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