On Wed, Feb 27, 2013 at 5:39 AM, Linus Torvalds torvalds@linux-foundation.org wrote:
On Mon, Feb 25, 2013 at 4:05 PM, Dave Airlie airlied@linux.ie wrote:
Highlights:
i915: all over the map, haswell power well enhancements, valleyview macro horrors cleaned up, killing lots of legacy GTT code,
Lowlight:
There's something wrong with i915 DP detection or whatever. I get stuff like this:
[ 5.710827] [drm:intel_dp_aux_wait_done] *ERROR* dp aux hw did not signal timeout (has irq: 1)! [ 5.720810] [drm:intel_dp_aux_wait_done] *ERROR* dp aux hw did not signal timeout (has irq: 1)! [ 5.730794] [drm:intel_dp_aux_wait_done] *ERROR* dp aux hw did not signal timeout (has irq: 1)! [ 5.740782] [drm:intel_dp_aux_wait_done] *ERROR* dp aux hw did not signal timeout (has irq: 1)! [ 5.750775] [drm:intel_dp_aux_wait_done] *ERROR* dp aux hw did not signal timeout (has irq: 1)! [ 5.750778] [drm:intel_dp_aux_ch] *ERROR* dp_aux_ch not done status 0xa145003f ..... [ 8.149931] [drm:intel_dp_aux_ch] *ERROR* dp_aux_ch not done status 0xa145003f
I have the same messages after upgrading up to b0af9cd9aab60ceb17d3ebabb9fdf4ff0a99cf50 But in my case when I reboot computer the second monitor, that plugged via HDMI, didn't works, end when I run `xrandr`, I have next messages in kern.log
Mar 3 18:09:15 home-spb kernel: [12321.758273] [drm:intel_dp_aux_ch] *ERROR* dp_aux_ch not done status 0xa143003f Mar 3 18:09:15 home-spb kernel: [12321.771715] [drm:intel_dp_aux_wait_done] *ERROR* dp aux hw did not signal timeout (has irq: 1)! Mar 3 18:09:15 home-spb kernel: [12321.782712] [drm:intel_dp_aux_wait_done] *ERROR* dp aux hw did not signal timeout (has irq: 1)! Mar 3 18:09:15 home-spb kernel: [12321.793715] [drm:intel_dp_aux_wait_done] *ERROR* dp aux hw did not signal timeout (has irq: 1)! Mar 3 18:09:15 home-spb kernel: [12321.804719] [drm:intel_dp_aux_wait_done] *ERROR* dp aux hw did not signal timeout (has irq: 1)! Mar 3 18:09:15 home-spb kernel: [12321.815725] [drm:intel_dp_aux_wait_done] *ERROR* dp aux hw did not signal timeout (has irq: 1)! Mar 3 18:09:15 home-spb kernel: [12321.817293] [drm:intel_dp_aux_ch] *ERROR* dp_aux_ch not done status 0xa143003f
# lspci | fgrep -i graph 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
I tested some commits, and here the results: - Breaked at v3.8-10206-gb0af9cd - Works normal v3.8-rc3-139-g34f2be4 - Works normal v3.8-rc3-188-g10aa17c - Works normal 6dc1c49
I've tested 0001-drm-i915-only-use-irq-for-dp-on-post-ilk.patch and it works for me. Thank, Dave.
and after that the screen ends up black.
It's happened twice now, but is not 100% repeatable. It looks like the message itself is new, but the black screen is also new and does seem to happen when I get the message, so...
The second time I touched the power button, and the machine came back. Apparently the suspend/resume cycle made it all magically work: the suspend caused the same errors, but then the resume made it all good again.
Some kind of missed initialization at bootup? It's not reliable enough to bisect, but I obviously suspect commit 9ee32fea5fe8 ("drm/i915: irq-drive the dp aux communication") since that is where the message was added..
Btw, looking at that commit, what do you think the semantics of the timeout in something like
done = wait_event_timeout(dev_priv->gmbus_wait_queue, C, 10);would be? What's that magic "10"? It's some totally random number.
Guys, it should be something meaningful. If you meant a tenth of a second, use HZ/10 or something. Because just the plain "10" is crazy. I happen to have CONFIG_HZ_1000=y, and you're apparently waiting for a hundreth of a second. Was that what you intended? Because if it was, it is still crap, since CONFIG_HZ might be 100, and then you're waiting for ten times longer.
IOW, passing in a random number like that is crazy. It cannot possibly be right.
I have no idea whether the timeout has anything to do with anything, but it reinforces my suspicion that there is something wrong with that commit.
Linus-- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
-- Respectfully Azat Khuzhin Primary email a3at.mail@gmail.com