Bug 43236

Summary:	A8-3870K graphics is broken
Product:	Drivers	Reporter:	Artyom Kunyov (artkun)
Component:	Video(DRI - non Intel)	Assignee:	drivers_video-dri
Status:	RESOLVED INVALID
Severity:	high	CC:	alexdeucher, artkun
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	3.2; 3.3.0	Subsystem:
Regression:	Yes	Bisected commit-id:
Attachments:	/var/log/messages

Description Artyom Kunyov 2012-05-12 13:15:47 UTC

I've tested Ubuntu 12.04 and latest F17 nightly build. After selecting kernel in GRUB, the monitor simply turns off because there is no signal. I've tried with both D-Sub and HDMI outputs. I can attach any logs you need.

Comment 1 Michel Dänzer 2012-05-12 13:19:26 UTC

So, does 'Kernel Version: >3.2' and 'Regression: Yes' mean this worked with 3.2 kernels but is broken with newer ones? If so, can you bisect?

Please attach the dmesg output corresponding to the problem.

Comment 2 Artyom Kunyov 2012-05-12 13:34:46 UTC

Sorry, my mistake, I meant >=3.2
I wrote "3.2" because 12.04 has 3.2 kernel. There is one confusing thing: the driver works well now in Fedora 16 with the latest 3.3.4 kernel.

Comment 3 Artyom Kunyov 2012-05-12 20:30:18 UTC

Okay, I finally discovered what is going on here.
First of all, now this bug seems to be reproducible only with D-Sub output. My motherboard is ASRock A75M, monitor is LG E2360. Everything works very well (and with a good hardware acceleration) on all kernel versions if I connect my monitor with an HDMI cable.

If I connect it with D-Sub cable:
Bug is reproducible with: default 12.04 LTS kernel, and with 3.3.0; 
it is NOT reproducible on the latest 3.3.4.

So, with the latest 3.3.4 kernel I have a good hardware acceleration without having to boot with nomodeset.

Though this problem seems to be solved in latest stable kernel, I attach the /var/log/messages file I copied from hard drive with F17 with 3.3.0 kernel, just after encountering this bug.

Sorry for my English.

Comment 4 Artyom Kunyov 2012-05-12 20:31:18 UTC

Created attachment 73264 [details]
/var/log/messages

Comment 5 Alex Deucher 2012-05-13 13:39:23 UTC

You need this kernel patch to get VGA ports with DP bridges working:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=700698e7c303f5095107c62a81872c2c3dad1702