[Bug 90469] [BYT dsi] WARNING: CPU: 3 PID: 265 at drivers/gpu/drm/drm_irq.c:1130 drm_wait_one_vblank+0x177/0x180()

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90469

--- Comment #38 from Christian Hartmann <cornogle at googlemail.com> ---
for all versions since 3.18/3.19  ( as fredlet started with an install image
for uefi32 bit systems) I can always see backlight. Its the only indication for
me to see that the system is running. 

It has no power led. It has only one microusb port for loading the battery or
to attach an usb hub for using a keyboard + mouse etc.

So, the question if I see backlight: yes I see always backlight.

On power on (pressing 3sec the power button), the device itself flickers to
indicate that it has been powered up. 

If I start with drm, yes the screen shows a little bit of initramfs (some lines
at the tp of the screen showing just some ioremap errors and switches or
flickers shortly ( I think it would be the starting plymouth).

If I start w/o drm I see also the ioremap errors mentioned above, but than it
goes on with the syslog from systemd printing all message (too fast to read it
by the way) until the splashscreen is seen. at gdm works but without drm as
said.

I have applied the last patch and the first two boots are black. 

I have now hardcoded the bus_number to 3 as said in your preprevoius comment,
the result of this change will be known at the next reboot
(this was build of kernel 4.2.0-83)

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