[Bug 93744] New: [byt dsi] Wrong PLL on HP Pro Tablet 408

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93744

            Bug ID: 93744
           Summary: [byt dsi] Wrong PLL on HP Pro Tablet 408
           Product: DRI
           Version: XOrg git
          Hardware: x86 (IA32)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: ettavolt at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 121091
  --> https://bugs.freedesktop.org/attachment.cgi?id=121091&action=edit
Log with drm.debug=14 on kernel command line.

I'm trying to configure Ubuntu 15.10 on HP Pro Tablet 408 G1 (P/N: L3S95AA#ACB
if anyone interested). It is based on Z3736F.
Currently I'm stuck with problem in i915. It can't determine PLL divider (?).
With nomodeset I can get to desktop and then xrandr reports this mode: 800 x
1280 (0x26e) 78.848MHz / 98.56kHz / 77 Hz.
In the dmesg.log you can see modified '[drm:vlv_get_dsi_pclk [i915]] *ERROR*
wrong m_seed programmed' message, because I thought I could get something
useful out of pll_div value. :) Obviously, this was wrong.
I've got picture on LCD connected to HDMI. 'Displays' applet showed both
screens active with native resolution set, but tablet's screen was black.
Will it help if I attach log for booting in such configuration? What debug
level should I set?

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