[Bug 200045] New: i2c-algo-bit: black screen on 'radeon' module probing

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=200045

            Bug ID: 200045
           Summary: i2c-algo-bit: black screen on 'radeon' module probing
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.16
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: cerg2010cerg2010 at mail.ru
        Regression: No

Created attachment 276499
  --> https://bugzilla.kernel.org/attachment.cgi?id=276499&action=edit
lspci -v

Hi,

After updating to the 4.16 kernel I started to get a black screen on boot,
without something useful in log. This bug also happens in latest version
(4.17.1). I'm using HP Pavilion dv6-3090er laptop with an exotic ATI/AMD
switchable graphics (radeon 4250 integrated/5650 discrete).

I bisected the issue down to commit 3e5f06bed72fe72166a6778f630241a893f67799
("i2c: algo-bit: init the bus to a known state") and reverting this fixes the
problem. Also loading radeon module with hw_i2c=1 gives me working display with
full brightness, and attempt to change it results in reboot.

Thanks.

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