[Bug 31972] New: 2.6.38.1: radeon hd 6870: kms, hdmi, signal is correct only for 1-2 seconds
https://bugzilla.kernel.org/show_bug.cgi?id=31972
Summary: 2.6.38.1: radeon hd 6870: kms, hdmi, signal is correct only for 1-2 seconds Product: Drivers Version: 2.5 Platform: All OS/Version: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Video(DRI - non Intel) AssignedTo: drivers_video-dri@kernel-bugs.osdl.org ReportedBy: arekm@maven.pl Regression: No
Created an attachment (id=52182) --> (https://bugzilla.kernel.org/attachment.cgi?id=52182) dmesg with messages
I'm using 2.6.38.1 with radeon hd 6870 (http://www.gigabyte.com/products/product-page.aspx?pid=3615#ov) connected only to toshiba regza tv with HDMI connector. Nothing else is connected.
After modprobe radeon KMS kicks in, resolution is changed and everything looks fine for 1-2 seconds. Then signal is lost according to tv and there are tons of: "[drm:atom_dp_get_link_status] *ERROR* displayport link status failed", some kworker eats 90% of cpu and fans go up.
dmesg attached.
https://bugzilla.kernel.org/show_bug.cgi?id=31972
Alex Deucher alexdeucher@gmail.com changed:
What |Removed |Added ---------------------------------------------------------------------------- CC| |alexdeucher@gmail.com
--- Comment #1 from Alex Deucher alexdeucher@gmail.com 2011-03-27 20:38:53 --- Is this a regression? If so what version worked previously? It looks like one of the hotplug interrupt is firing repeatedly (maybe a loose/bad cable?). Can you attach the dmesg output with drm debug enabled (load drm.ko with debug=1)?
https://bugzilla.kernel.org/show_bug.cgi?id=31972
--- Comment #2 from Arkadiusz Miskiewicz arekm@maven.pl 2011-03-27 21:00:41 --- Created an attachment (id=52212) --> (https://bugzilla.kernel.org/attachment.cgi?id=52212) dmesg with drm debug=1
Not a regression since 2.6.37 didn't support this card at all.
Bad cable... I forgot to mention one important thing. Video card is not connected directly to toshiba tv but through pioneer vsx-920-k amplifier. I just did a test and connected directly to tv. The problem is gone.
So pioneer could be suspected for dirty games but there is no problem with windows working in the same setup (I use 1920x1080 in windows; some gpu hungry games like call of duty 4 etc work fine in this setup), so there is a chance for a radeon drm bug.
dmesg with debug attached.
https://bugzilla.kernel.org/show_bug.cgi?id=31972
--- Comment #3 from Arkadiusz Miskiewicz arekm@maven.pl 2011-03-27 21:04:12 --- gdm started nicely when connected directly to TV. Then I changed cable to go through pioneer and... gdm still works fine and no bad things in dmesg.
ps. GPU is becoming very hot when "displayport link status failed" happens.
https://bugzilla.kernel.org/show_bug.cgi?id=31972
Alan alan@lxorguk.ukuu.org.uk changed:
What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED CC| |alan@lxorguk.ukuu.org.uk Resolution| |OBSOLETE
--- Comment #4 from Alan alan@lxorguk.ukuu.org.uk 2012-08-20 15:18:17 --- If this is still seen with modern kernels please reopen/update thanks
dri-devel@lists.freedesktop.org
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