From: Daniel Vetter <daniel.vetter@ffwll.ch>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: intel-gfx <intel-gfx@lists.freedesktop.org>,
Kernel development list <linux-kernel@vger.kernel.org>
Subject: Re: Excessive WARN()s in Intel 915 driver
Date: Tue, 7 Jan 2014 21:12:16 +0100 [thread overview]
Message-ID: <CAKMK7uFEzOKYjojVop1ouRsJWyeK-rnKH-udBxZcc9fwKCOV6w@mail.gmail.com> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1401071341180.1296-100000@iolanthe.rowland.org>
On Tue, Jan 7, 2014 at 7:50 PM, Alan Stern <stern@rowland.harvard.edu> wrote:
> After all, it's not like there's anything I can do to fix the hardware,
> is there? And it doesn't look like the pipe state mismatch is going to
> go away by itself. Or is this a genuine, fixable, software bug?
These are genuine software bugs - every time one of these WARNs fires
our software tracking and the actual hardware state have diverged,
which eventually will lead to really subtle and hard to reproduce
bugs.
> In any case, wouldn't it be good enough for this message to be
> dev_warn() instead of WARN()?
I really want users to report these issues, and excessive WARNs seems
to be the only way to get those reports. Please boot with
drm.debug=0xe added to your kernel cmdline and reproduce this issues.
Also, which precise kernel are you running? Testing latest -rc is
always recommended, this state checker code is fairly new and gets
constantly extended and bugs fixed ...
Yours, Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
next prev parent reply other threads:[~2014-01-07 20:12 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-07 18:50 Excessive WARN()s in Intel 915 driver Alan Stern
2014-01-07 20:12 ` Daniel Vetter [this message]
2014-01-08 16:08 ` Alan Stern
2014-01-08 16:17 ` Daniel Vetter
2014-01-08 18:34 ` Alan Stern
2014-01-08 20:21 ` Daniel Vetter
2014-01-08 20:21 ` Daniel Vetter
2014-01-08 23:15 ` Alan Stern
2014-01-13 20:16 ` Alan Stern
2014-01-14 9:05 ` Daniel Vetter
2014-01-14 14:43 ` Alan Stern
2014-01-27 9:02 ` Daniel Vetter
2014-01-27 15:30 ` Alan Stern
2014-01-27 15:56 ` Daniel Vetter
2014-01-27 16:05 ` Alan Stern
2014-01-27 16:36 ` Daniel Vetter
2014-01-27 16:36 ` Daniel Vetter
2014-01-27 17:14 ` Alan Stern
2014-01-28 16:34 ` Alan Stern
2014-01-28 16:34 ` Alan Stern
2014-01-14 12:52 ` [Intel-gfx] " Jani Nikula
2014-01-08 18:43 ` Ville Syrjälä
2014-01-08 18:43 ` Ville Syrjälä
2014-01-28 17:17 ` [Intel-gfx] " Daniel Vetter
2014-01-28 17:17 ` Daniel Vetter
2014-01-28 19:42 ` [Intel-gfx] " Daniel Vetter
2014-01-28 19:42 ` Daniel Vetter
2014-01-30 14:53 ` [Intel-gfx] " Alan Stern
2014-01-30 14:53 ` Alan Stern
2014-01-30 15:22 ` [Intel-gfx] " Daniel Vetter
2014-01-30 15:22 ` Daniel Vetter
2014-01-30 15:52 ` [Intel-gfx] " Alan Stern
2014-01-30 15:52 ` Alan Stern
2014-06-25 18:06 ` Regression in i915 driver in 3.16-rc2 Alan Stern
2014-06-25 18:26 ` [Intel-gfx] " Ville Syrjälä
2014-06-25 18:26 ` Ville Syrjälä
2014-06-25 18:50 ` [Intel-gfx] " Alan Stern
2014-06-25 18:50 ` Alan Stern
2014-06-30 10:52 ` [Intel-gfx] " Jani Nikula
2014-06-30 10:52 ` Jani Nikula
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