[Bug 97060] New: Screen goes blank after boot, kernel 4.7 vs 4.6

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97060

            Bug ID: 97060
           Summary: Screen goes blank after boot, kernel 4.7 vs 4.6
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: alexey.shumitsky at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 125278
  --> https://bugs.freedesktop.org/attachment.cgi?id=125278&action=edit
dmesg kernel 4.7-rc7

With kernel 4.7-rc7 (drm-intel-nightly) laptop screen (LVDS) goes blank after
inteldrmfb is loaded.


4.7.0-rc7+ #1 SMP Sat Jul 23 16:05:00 CEST 2016 x86_64 x86_64 x86_64 GNU/Linux

It appears to me the problem is with setting panel to wrong mode:

[    2.737896] [drm:parse_lfp_panel_data] Found panel mode in BIOS VBT tables:
[    2.737900] [drm:drm_mode_debug_printmodeline] Modeline 0:"1366x768" 0 76110
1366 1397 1462 1560 768 772 784 814 0x8 0xa
[    2.737902] [drm:parse_lfp_panel_data] VBT initial LVDS value 300


While with previous kernel, 4.6, there was:

[    4.684175] [drm:parse_lfp_panel_data] Found panel mode in BIOS VBT tables:
[    4.684177] [drm:drm_mode_debug_printmodeline] Modeline 0:"1920x1080" 0
144200 1920 1968 2040 2116 1080 1083 1088 1137 0x8 0xa
[    4.684178] [drm:parse_lfp_panel_data] VBT initial LVDS value 33c

My notebook uses fullhd panel, so resolution should be 1920x1080 clearly.

Full dmesg obtained with drm.debug=0xe is attached.

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