Launchpad has imported 2 comments from the remote bug at https://bugs.freedesktop.org/show_bug.cgi?id=84203.
If you reply to an imported comment from within Launchpad, your comment will be sent to the remote bug automatically. Read more about Launchpad's inter-bugtracker facilities at https://help.launchpad.net/InterBugTracking. ------------------------------------------------------------------------ On 2014-09-22T22:40:48+00:00 Jean-Louis Dupond wrote: This week I tried HDMI again on my system, and noticed it was completely broken. Got just no signal on my screen. I knew it was working some months (and upgrades) ago. After testing I found out the issue was introduced between kernel v3.14 and v3.15. Situation: Insert HDMI cable into my laptop, and no signal on the external display. The dmesg fills with errors also: [ 186.210622] nouveau E[ PDISP][0000:01:00.0] INVALID_STATE [UNK08] chid 0 mthd 0x0080 data 0x00000000 [ 186.210627] nouveau E[ PDISP][0000:01:00.0] Core: [ 186.210634] nouveau E[ PDISP][0000:01:00.0] 0x0084: 0x5dc34da1 -> 0x80000000 [ 186.210640] nouveau E[ PDISP][0000:01:00.0] 0x0088: 0x00000000 etc. After some git bisect playtime, I found out the following commit caused the issue: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/gpu/drm/nouveau?id=05c63c2ff23a80b654d6c088ac3ba21628db0173 So I went back to stable 3.16 (Ubuntu Utopic version), and did a git revert for that commit. And yep, HDMI output was working again, and no more nouveau errors in dmesg. My device: [ 30.823267] nouveau [ DEVICE][0000:01:00.0] BOOT0 : 0x0c1a00a1 [ 30.823269] nouveau [ DEVICE][0000:01:00.0] Chipset: GF108 (NVC1) [ 30.823270] nouveau [ DEVICE][0000:01:00.0] Family : NVC0 Laptop dell xps 15 l502x Reply at: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1374607/comments/0 ------------------------------------------------------------------------ On 2014-09-22T22:46:52+00:00 Jean-Louis Dupond wrote: Created attachment 106697 full dmesg Attached a full dmesg. The last lines are when I stop lightdm, and runpm stops the nvidia card. This also causes shutdown to hang. Reply at: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1374607/comments/1 ** Changed in: linux Status: Unknown => Confirmed ** Changed in: linux Importance: Unknown => Medium -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1374607 Title: nouveau - HDMI gives no more signal since 3.15 (optimus) To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1374607/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
