[Bug 102022] [HSW] i915: null pointer in intel_dp_max_link_rate+0x5/0x80

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102022

--- Comment #6 from sassmann at redhat.com ---
(In reply to Dhinakaran Pandiyan from comment #5)
> (In reply to sassmann from comment #0)
> > After switching display inputs on the monitor (Dell U3415W) the screen
> > wouldn't come back from standby. Reproduced this with drm-tip
> 
> Thanks for filing this bug.
> 
> Can you please describe this a bit more in detail?

Sure, same setup as in bug #90963.
Lenovo w541 docked in ThinkPad Dock with lid close (permanently).
Dell U3415W display connected via DP as the only display.

> What was the display input switch that caused this?

The Monitor has 2 DP inputs. Switching input from the DP1, the w541 is
connected to, to the other DP and back is sufficient to cause this problem.

> What was the DP mode in the monitor at that time?

Setting monitor to DP 1.1 and DP 1.2 both show the problem.

> How did you switch the display input?

Via monitor on-screen menu.

> Does this happen if you don't force the mode from cmdline?

That helps, I can switch DP inputs now without a crash! I had to force monitor
input at some point as otherwise the external monitor wouldn't get detected.
Now it seems to work better, so I probably can remove that quirk.

> Can you please try this hack?

Already tried the patch from bug #90963, didn't help with this.

-- 
You are receiving this mail because:
You are the assignee for the bug.
You are on the CC list for the bug.
You are the QA Contact for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20170811/ff1b4936/attachment.html>