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-...@kernel-bugs.osdl.org
Reporter: cerg2010cerg2...@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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