[Bug 108279] [Ubuntu 18.10] eDP resolution 640x360 failed on WHLU and ICL-U/Y.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108279

--- Comment #10 from Mika Kahola <mika.kahola at intel.com> ---
My setup:
Platform: Intel Corporation Ice Lake Client Platform/IceLake Y LPDDR4x T4 RVP
TLC, BIOS ICLSFWR1.R00.2454.A00.1811082216 11/08/2018
Kernel: drm-tip 4.20.0-rc6
OS: Ubuntu 18.04 LTS
Display: eDP (native)
Command 
xrandr -s 640x360
works ok.

Command
xrandr -s 512x288
hangs up after couple of seconds (mouse cursor still works).


The X shows the following log when changing resolution 

[ 140.606] (II) modeset(0): EDID vendor "SHP", prod id 5225
[ 140.606] (II) modeset(0): Printing DDC gathered Modelines:
[ 140.606] (II) modeset(0): Modeline "3200x1800"x0.0 373.25 3200 3248 3280 3360
1800 1803 1808 1852 -hsync -vsync (111.1 kHz eP)
[ 140.894] (II) modeset(0): Allocate new frame buffer 512x288 stride
[ 141.826] (II) modeset(0): EDID vendor "SHP", prod id 5225
[ 141.826] (II) modeset(0): Printing DDC gathered Modelines:
[ 141.826] (II) modeset(0): Modeline "3200x1800"x0.0 373.25 3200 3248 3280 3360
1800 1803 1808 1852 -hsync -vsync (111.1 kHz eP)

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