[Bug 85346] New: Z97: Setting VGA to 1920x1200 at 60Hz causes "Configure crtc 0 failed" error

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85346

            Bug ID: 85346
           Summary: Z97: Setting VGA to 1920x1200 at 60Hz causes "Configure
                    crtc 0 failed" error
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: colin.e.uk at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 108259
  --> https://bugs.freedesktop.org/attachment.cgi?id=108259&action=edit
TGZ containing dmesg, xorg.conf (modified) and Xorg.0.log

System environment:
-- chipset: Intel Z97
-- system architecture: 64-bit
-- xf86-video-intel: ?
-- xserver: xorg-server 2:1.16.1-1
-- mesa: ?
-- libdrm: 2.4.58-2
-- kernel:3.16-2-amd64
-- Linux distribution: SMP Debian 3.16.3-2 (2014-09-20) x86_64 GNU/Linux
-- Machine or mobo model: MSI Z97M-G43
-- Display connector: VGA
-- Monitor: Dell 2405FPW (24" 1920x1200)

Reproducing steps:

System is not picking up correct monitor resolutions via EDID. The only choices
offered are: 1024x768, 800x600, 848x480, 640x480 (all at 60Hz)

get-edid reports: "The EDID data should not be trusted as the VBE call failed"

1) Generate a new modeline with gtf

$ gtf 1920 1200 60

  # 1920x1200 @ 60.00 Hz (GTF) hsync: 74.52 kHz; pclk: 193.16 MHz
  Modeline "1920x1200_60.00"  193.16  1920 2048 2256 2592  1200 1201 1204 1242 
-HSync +Vsync

2) Generate new Xorg.conf

Go to a new virtual terminal (as root).

$ service lightdm stop
$ Xorg -configure /etc/X11/xorg.conf.current
$ service lightdm start
$ cp /etc/X11//etc/X11/xorg.conf.current xorg.conf

3) Edit Xorg.conf to add new modeline (copy attached)
4) Restart Xorg again (as in step 2)

5) Attempt to set new mode

System sees newly defined mode-

$ xrandr --current
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 8192 x 8192
VGA1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x
0mm
   1920x1200_60  60.00  
   1024x768      60.00* 
   800x600       60.32    56.25  
   848x480       60.00  
   640x480       59.94  
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
HDMI3 disconnected (normal left inverted right x axis y axis)

Attempt to use new mode-

$ xrandr --output VGA1 --mode "1920x1200_60"
xrandr: Configure crtc 0 failed

Additional info:

Motherboard (MSI Z97M-G43) specifically states that the board supports up to
1920x1200 at 60Hz on the VGA port.

dmesg includes the following error-

[768761.630664] WARNING: CPU: 0 PID: 14759 at
/build/linux-P15SNz/linux-3.16.3/drivers/gpu/drm/i915/intel_display.c:9696
__intel_set_mode+0x131f/0x1560 [i915]()

(not sure if this is relevant)

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