bug? panel looks weird only when docked to left side

[Grant]

>> I had a simular problem with my intel graphics card. The default
>> acceleration mode was changed. Here is some information on this:
>> https://wiki.archlinux.org/index.php/Intel_Graphics#Choose_acceleration_method
>
> You aced it.  I switched intel from sna to uxa and the problem is
> gone.  I will file an intel bug.

Actually it looks like the problem exists for me in
xf86-video-intel-2.21.15 but not in 2.99.903.

- Grant


>>> My hidden panel looks great docked to the top, bottom, or right side
>>> of the screen, but if it's docked to the left side it looks weird when
>>> unhidden.  By weird I mean the background gray color has a darker gray
>>> pattern running through it.  I can attach a screenshot if necessary.
>>> Please let me know if I should file a bug.