[Bug 89704] [byt dsi] No image on WinBook TW700 tablet's DSI display after DRM initializes

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89704

--- Comment #11 from Adam Honse <calcprogrammer1 at gmail.com> ---
I've been reading through this older bug report that documents a similar issue:

https://bugzilla.kernel.org/show_bug.cgi?id=68451

I installed the Ubuntu PPA 3.13 kernel and started with video=VGA-1:800x1280e. 
With this, the Intel framebuffer does display and I can launch an X server with
xinit.  Once the X server starts however, the display becomes mangled.  I can
see that it is rendering (if I run glxgears) but only because random pixels are
changing.

If I switch VT back to another terminal the screen is readable again.  It
appears that xinit is setting the mode to 1024x768 for some reason.  I then did
the following to set an 800x1280 mode manually:

adam at Adam-WinBook:~$ xrandr --display :0
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
   1024x768      60.00* 
   800x600       60.32    56.25  
   848x480       60.00  
   640x480       59.94  
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)

adam at Adam-WinBook:~$ xrandr --display :0 --newmode "800x1280" 100.56 800 832
1208 1240 1280 1306 1319 1345

adam at Adam-WinBook:~$ xrandr --display :0 --addmode VGA1 800x1280

adam at Adam-WinBook:~$ xrandr --display :0 --output VGA1 --mode 800x1280

Now the display is correct and I can run "glxinfo | grep renderer" and see Bay
Trail and run glxgears.  Is there any information I can gather about the panel
from this setup that would help in determining the issues it has on the newer
kernels?  I'll post a dmesg and Xorg.0.log for this as well.

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