On my iris 6100 pro on a macbook pro, kernel 4.11.0 I get a lot of errors like those using 3 DP displays with daisy chaining: [drm:intel_mst_disable_dp [i915]] *ERROR* failed to update payload -22 [drm:intel_dp_start_link_train [i915]] *ERROR* failed to get link status [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe C FIFO underrun [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun
(In reply to Maël Lavault from comment #0) > On my iris 6100 pro on a macbook pro, kernel 4.11.0 I get a lot of errors > like those using 3 DP displays with daisy chaining: Is this a regression? Please add drm.debug=14 module parameter, and attach dmesg from boot to the problem.
I'm not sure if this is a regression or not, displayport with daisy chaining never worked flawlessly. I will try that, thanks !
Reporter, please provide data asked, thanks. If this is not valid anymore, please close.
The thing is, those errors do not happen on boot, they happen randomly while using the computer. I added the parameter and i'm waiting for it to happen.
(In reply to Maël Lavault from comment #4) > The thing is, those errors do not happen on boot, they happen randomly while > using the computer. I added the parameter and i'm waiting for it to happen. Changing priority since is very sporadic. Thanks.
Hello Maël, any luck reproducing this bug? Thank you.
Yes I get it multiple time a day and my gnome shell completely crash and sometimes restart to login screen, sometimes I have to reboot. I'm using kernel 4.12.8 currently.
(In reply to Maël Lavault from comment #7) > Yes I get it multiple time a day and my gnome shell completely crash and > sometimes restart to login screen, sometimes I have to reboot. I'm using > kernel 4.12.8 currently. Then have you been able to get a dmesg with the "drm.debug=14" parameter on it? As you mention problem doesn't occurs at boot, probably you'll need to increase dmesg size with "log_bug_len=4M" (or bigger than 4M).
Sorry for pestering. Any pattern identified or log collected so far? Thank you.
First of all. Sorry about spam. This is mass update for our bugs. Sorry if you feel this annoying but with this trying to understand if bug still valid or not. If bug investigation still in progress, please ignore this and I apologize! If you think this is not anymore valid, please comment to the bug that can be closed. If you haven't tested with our latest pre-upstream tree(drm-tip), can you do that also to see if issue is valid there still and if you cannot see issue there, please comment to the bug.
Closing, please re-open if still occurs.
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