[Bug 110891] New: Wrong PLL on HP Pro Tablet 408

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=110891

            Bug ID: 110891
           Summary: Wrong PLL on HP Pro Tablet 408
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.2.0-24-generic #28~15.10-Ubuntu
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: ettavolt at gmail.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

Created attachment 199791
  --> https://bugzilla.kernel.org/attachment.cgi?id=199791&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.

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