[Bug 82286] Can't set lower resolution for LVDS panel

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82286

--- Comment #9 from Long Bu <long.bu at intel.com> ---
1. boot with drm.debug=6, resolution is 1024x768 (panel's native resolution)
   pull dmesg as attached.

2. in terminal
    a)   run cvt 800 600 to get 800x600 parameters
    b)   run  xrandr --newmode "800x600_60.00" 38.25 800 832 912 1024 600 603
607 624 -hsync +vsync
    c)   run  xrandr  --addmode DP2 "800x600_60.00"
    d)  run xrandr to check new mode
         DP2 connected 1024x768+316+768 (normal left inverted right x axis y
axis) 518mm x 333mm
                1024x768 59.9*+ 85.0 
                848x480 60.0 
              800x600_60.00 (0x85) 38.2MHz
              h: width 800 start 832 end 912 total 1024 skew 0 clock 37.4KHz
              v: height 600 start 603 end 607 total 624 clock 59.9Hz
    e)   run xrandr to set new mode
         xrandr --output DP2 --mode 800x600_60.00

3. when set 800x600 fail, pull xlog and dmesg as attached.

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