When booting without nomodeset the video starts to switch between normal video and black screen, and mouse moves slow. I can confirm that the display runs at 1920x1080. With some kernels I saw the mouse moving fine. Distros I have tested: OpenSUSE, Ubuntu, Sabayon, Fedora, ArchLinux, Linux Mint I couldn't find a distro that works ok. Those links describe the problem in detail: http://www.grputland.com/2011/12/ubuntu-1204-alpha-1-sandy-bridge.html http://www.debianuserforums.org/viewtopic.php?f=56&t=1586&start=20 This link is my main bug report on Landscape, where some log files can be found: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/912397 Is it a i915 problem? or is something else like the display turns off? Workarround: Must set nomodeset in kernel params for the computer to be usable. But I only get 1280x1024 not proportional res. If any other info is needed, let me know and I'll add it. Thanks.
Here is a link that describe exactly the same problem: https://bugs.freedesktop.org/show_bug.cgi?id=42278 Hope it helps.
It's working if I turn on the PC (I mean no reboot) and start with only "drm_kms_help.poll=0". If I reboot, the screen starts to turn on and off. I'll be doing more tests on next days.
Sorry: the param is "drm_kms_helper.poll=0"
To clarify: As soon as you reboot the problem appears, even if you add "drm_kms_helper.poll=0"? Also, please boot with drm.debug=0xe added to your kernel cmdline and attach the complete dmesg.
Another thing: Is there anything in dmesg when this problem happens?
Hi Daniel, If I reboot the problem appears again. I need to turn on from a completely shutdown. But, it's a little different: The screen goes blank keeps that way (or at least, this was I got with the one minute aprox I waited). Here is the working dmesg: http://pastebin.com/Cj3CeB9E And here is the blank screen dmesg: http://pastebin.com/guM4GP0i My grub: http://pastebin.com/8QjdSyDc (All will expire in 1 month) Please, have a read on http://www.grputland.com/2011/12/ubuntu-1204-alpha-1-sandy-bridge.html Gavin told me that for him is working ok even when reboots. My PC is a AIO Dell Inspiron 2320. Please if you need any other info let me know. If a video could help, I'm willing to do it as well. Regards. Gustavo.
Please attach the files to bugzilla report, that way they don't expire. Thanks.
And I don't see any drm debug messages in the dmesg files you've linked. Please add drm.debug=0xe to your kernel commandline and then grab the complete dmesg.
Created attachment 73294 [details] Working dmesg (turn on after shutdown) Working dmesg (turn on after shutdown)
Created attachment 73295 [details] Fail dmesg (turn on after reboot)
After getting the "fail dmesg" file, I shutdown the PC and started again, expecting normal start, and I got a blank screen after grub selection. This happened twice. On the 3rd start, it started ok (this session I'm using to write this comment). It's a very strange behaivor. Let me know if you need something else.
Can you please retest on latest 3.7-rc kernels? Those contain a fully redesigned modeset framework, which might help here. Otherwise this smells like hpd handling gone sour ...
Hi Daniel, I've upgraded to Ubuntu 12.10 which uses kernel 3.5 and it's working OK now, without needing the "drm_kms_helper.poll=0" param. Should I close the bug?
Yeah, closing since it seems to work now, thanks for reporting back.