[Bug 196733] New: GM107 video card displays blank screen after 4.12 update with error EDID checksum

* [Bug 196733] New: GM107 video card displays blank screen after 4.12 update with error EDID checksum
@ 2017-08-22 23:39 bugzilla-daemon
  2017-08-22 23:45 ` [Bug 196733] " bugzilla-daemon
  2017-09-12 19:30 ` bugzilla-daemon
  0 siblings, 2 replies; 3+ messages in thread
From: bugzilla-daemon @ 2017-08-22 23:39 UTC (permalink / raw)
  To: dri-devel

https://bugzilla.kernel.org/show_bug.cgi?id=196733

            Bug ID: 196733
           Summary: GM107 video card displays blank screen after 4.12
                    update with error EDID checksum
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.12.8
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: mrlhwliberty@gmail.com
        Regression: No

Created attachment 258057
  --> https://bugzilla.kernel.org/attachment.cgi?id=258057&action=edit
dmesg

After upgrading from kernel 4.11 to 4.12, I cannot use discrete video card mode
for my Thinkpad P50 with GM107 GPU (Quandro M1000M). It will boot into blank
screen for the laptop screen. In the external screen, the console will display
some very weird font. Startx will result in blank screen again.

I tried dmesg and found error message. Full dmesg is attached.

[    2.897407] nouveau 0000:01:00.0: NVIDIA GM107 (117310a2)

[    3.242850] nouveau 0000:01:00.0: eDP-1: EDID is invalid:
[    3.242851]  [00] BAD  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[    3.242852]  [00] BAD  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[    3.242852]  [00] BAD  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[    3.242852]  [00] BAD  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[    3.242853]  [00] BAD  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[    3.242853]  [00] BAD  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[    3.242854]  [00] BAD  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[    3.242854]  [00] BAD  00 00 00 00 00 00 00 00 00 00 00 00 00 ff 00 ff
[    3.242855] nouveau 0000:01:00.0: DRM: DDC responded, but no EDID for eDP-1

Downgrading to kernel 4.11.5, the GPU in discrete mode works fine. It doesn't
have the EDID invalid error. 
The error persists even on the latest 4.12.8.
The hybrid mode GPU works fine for both kernels though.

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