[Bug 101245] New: Haswell ULT max. resolution regression in KMS

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101245

            Bug ID: 101245
           Summary: Haswell ULT max. resolution regression in KMS
           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: gate03 at landcroft.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

With a 4.8.17 kernel or earlier, console graphics is set (as expected) to
2560x1600 with HDMI connected to a suitable monitor.

    # lspci|grep -i vga
    00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated
Graphics Controller (rev 09)

:With a 4.9.1 or later kernel, using a .config taken from a working
configuration, resolution is 1920x1200.  When it is so set, this sequence of
commands, within a terminal window in an X session, does not effect any
increase in resolution:

    # cvt 2560 1600
    # 2560x1600 59.99 Hz (CVT 4.10MA) hsync: 99.46 kHz; pclk: 348.50 MHz
    Modeline "2560x1600_60.00"  348.50  2560 2760 3032 3504  1600 1603 1609
1658 -hsync +vsync
    # xrandr --newmode "2560x1600_60.00"  348.50  2560 2760 3032 3504  1600
1603 1609 1658 -hsync +vsync
    # xrandr --addmode HDMI1 "2560x1600_60.00"
    # xrandr --output HDMI1 --mode 2560x1600_60.00 --verbose
    screen 0: 2560x1600 676x422 mm  96.15dpi
    crtc 0: 2560x1600_60.00  59.99 +0+0 "HDMI1"
    xrandr: Configure crtc 0 failed
    crtc 0: disable
    crtc 1: disable
    crtc 2: disable
    crtc 3: disable
    screen 0: revert
    crtc 0: revert
    crtc 1: revert
    crtc 2: revert
    crtc 3: revert
    #

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