[Bug 59785] New: Display shuts off when switching to discrete graphics card

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=59785

          Priority: medium
            Bug ID: 59785
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: Display shuts off when switching to discrete graphics
                    card
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: critical
    Classification: Unclassified
                OS: Linux (All)
          Reporter: dmallon83 at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 73549
  --> https://bugs.freedesktop.org/attachment.cgi?id=73549&action=edit
Git bisect log

I have an HP Envy 14 with a muxed intel/radeon graphics setup. After commit
"[ea9d758d6ddb9f4bb9639619100743e8f5fa85a0] drm/i915: push commit_output_state
past the crtc/encoder preparing" I now get a completely black (no backlight)
screen when switching from the intel to the radeon card. I bisected between
3.6.11 and 3.7-rc1 and found the above mentioned commit to be the culprit. I
attempted to revert the commit in the 3.7 tree, but too many other alterations
had been made on top of it to successfully revert.

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