[Bug 93017] complete system stalls while changing displays resolutions on a hybrid (intel/radeon) system

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changed bug 93017
What Removed Added
CC   debian@onerussian.com

Comment # 6 on bug 93017 from
Created attachment 119998 [details]
cut/paste terminal output for the 2nd crash: BUG: unable to handle kernel NULL
pointer dereference at 0000000000000042

The beast crashed again... I don't remember if I had those before -- just that
screen went off due to inactivity (may be it was also locked -- I was away from
the laptop) and when I came back -- it was stalled.  I had ssh session opened
at  another box watching journalctl -f (nothing in the logs on the drive after
reboot).  The last messages 

Nov 20 12:20:04 hopa kernel: [drm:drm_crtc_helper_set_config] attempting to set
mode from userspace
Nov 20 12:20:04 hopa kernel: [drm:drm_mode_debug_printmodeline] Modeline 57:""
0 296400 3840 3888 3920 4000 1200 1203 1209 1235 0x0 0x5
Nov 20 12:20:04 hopa kernel: [drm:radeon_encoder_set_active_device] setting
active device to 00000008 from 00000008 00000008 for encoder 2
Nov 20 12:20:04 hopa kernel: [drm:drm_crtc_helper_set_mode] [CRTC:29]
Nov 20 12:20:04 hopa kernel: [drm:radeon_atom_encoder_dpms] encoder dpms 30 to
mode 3, devices 00000080, active_devices 00000000
Nov 20 12:20:04 hopa kernel: BUG: unable to handle kernel NULL pointer
dereference at 0000000000000042


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