# Black screen after login with wayland, GTX750i, through DisplayPort to a Dell P2715Q under fedora 27: unable to handle kernel NULL pointer dereference at 00000000000000c0

**URL:** <https://forums.developer.nvidia.com/t/black-screen-after-login-with-wayland-gtx750i-through-displayport-to-a-dell-p2715q-under-fedora-27-unable-to-handle-kernel-null-pointer-dereference-at-00000000000000c0/59693>\
**Category:** Linux\
**Created:** [March 30, 2018, 1:26pm UTC](https://forums.developer.nvidia.com/t/black-screen-after-login-with-wayland-gtx750i-through-displayport-to-a-dell-p2715q-under-fedora-27-unable-to-handle-kernel-null-pointer-dereference-at-00000000000000c0/59693 "2018-03-30T13:26:29Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Tor](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@Tor](https://forums.developer.nvidia.com/u/Tor)\
**Post date:** [March 30, 2018, 1:26pm UTC](https://forums.developer.nvidia.com/t/black-screen-after-login-with-wayland-gtx750i-through-displayport-to-a-dell-p2715q-under-fedora-27-unable-to-handle-kernel-null-pointer-dereference-at-00000000000000c0/59693/1 "2018-03-30T13:26:29Z")

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My screen goes black after login (assuming when wayland starts) with fedora 27 on a GTX750i. Am including my dmegs and ndivia-debugdump output.

I do see these errors in dmesg output. All the details in the attached files;

[28.126915] [drm:drm\_atomic\_helper\_wait\_for\_dependencies [drm\_kms\_helper]] _ERROR_ [CRTC:32:crtc-0] flip\_done timed out  
[38.366501] [drm:drm\_atomic\_helper\_wait\_for\_dependencies [drm\_kms\_helper]] _ERROR_ [PLANE:30:plane-0] flip\_done timed out  
[48.605912] [drm:drm\_atomic\_helper\_wait\_for\_dependencies [drm\_kms\_helper]] _ERROR_ [CRTC:35:crtc-1] flip\_done timed out  
[58.845519] [drm:drm\_atomic\_helper\_wait\_for\_dependencies [drm\_kms\_helper]] _ERROR_ [PLANE:33:plane-2] flip\_done timed out  
[70.876806] nvidia-modeset: ERROR: GPU:0: Display engine push buffer channel allocation failed: 0x65 (Call timed out [NV\_ERR\_TIMEOUT])  
[70.877043] nvidia-modeset: ERROR: GPU:0: Failed to allocate display engine core DMA push buffer  
[74.878809] BUG: unable to handle kernel NULL pointer dereference at 00000000000000c0  
[74.878843] IP: \_nv002066kms+0xe/0x110 [nvidia\_modeset]

[dump.zip](https://forums.developer.nvidia.com/uploads/short-url/kbNLVfP11nzkApnq8B505H0RoWo.zip) (24.7 KB)  
[dmesg.log](https://forums.developer.nvidia.com/uploads/short-url/utTlfMIf5xURWO3hgvTErKCyXP8.log) (92.5 KB)

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<div class="post-metadata">

**Author:** ![Tor](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@Tor](https://forums.developer.nvidia.com/u/Tor)\
**Post date:** [March 30, 2018, 1:34pm UTC](https://forums.developer.nvidia.com/t/black-screen-after-login-with-wayland-gtx750i-through-displayport-to-a-dell-p2715q-under-fedora-27-unable-to-handle-kernel-null-pointer-dereference-at-00000000000000c0/59693/2 "2018-03-30T13:34:27Z")

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[root@barracuda tmp]# uname -a  
Linux barracuda 4.15.12-301.fc27.x86\_64 #1 SMP Thu Mar 22 19:25:27 UTC 2018 x86\_64 x86\_64 x86\_64 GNU/Linux

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<div class="post-metadata">

**Author:** ![generix](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/generix/32/16024_2.png) [@generix](https://forums.developer.nvidia.com/u/generix)\
**Post date:** [March 30, 2018, 1:37pm UTC](https://forums.developer.nvidia.com/t/black-screen-after-login-with-wayland-gtx750i-through-displayport-to-a-dell-p2715q-under-fedora-27-unable-to-handle-kernel-null-pointer-dereference-at-00000000000000c0/59693/3 "2018-03-30T13:37:34Z")

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You’re using kernel 4.15 + modeset=1, please try with driver 390.48.