Bug 110734

Summary: [drm:hsw_enable_pc8 [i915]] *ERROR* Switching to FCLK failed
Product: DRI Reporter: zhang rui <rui.zhang>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: RESOLVED WORKSFORME QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: medium CC: intel-gfx-bugs
Version: XOrg git   
Hardware: Other   
OS: All   
Whiteboard: Triaged
i915 platform: i915 features:
Attachments:
Description Flags
sleepgraph output with the error
none
[PATCH] drm/i915: Increase HSW/BDW FCLK<->LCPLL switch timeout none

Description zhang rui 2019-05-23 03:09:26 UTC 
[drm:hsw_enable_pc8 [i915]] *ERROR* Switching to FCLK failed

this error message is shown during suspend on a Lenovo broadwell laptop.

and it appears 416 times out of 2000 s2idle cycles. s2mem is broken on this laptop.
Comment 1 zhang rui 2019-05-23 03:10:12 UTC 
Created attachment 144327 [details]
sleepgraph output with the error
Comment 2 Ville Syrjala 2019-05-23 14:07:10 UTC 
Created attachment 144331 [details] [review]
[PATCH] drm/i915: Increase HSW/BDW FCLK<->LCPLL switch timeout

Might just be the hw is just a bit slow in responding. Increasing the timeout could avoid the error.
Comment 3 Lakshmi 2019-05-24 13:34:51 UTC 
Zhang, Can you verify the issue with the attached patch?
Comment 4 Lakshmi 2019-05-31 08:04:29 UTC 
Zhang, any updates here?
Comment 5 Lakshmi 2019-07-02 06:41:32 UTC 
No feedback for more than a month. Closing this bug as WORKSFORME. 

If the issue persists with the attached patch, please reopen the issue. Remember to attach dmesg from boot with kernel parameters drm.debug=0x1e log_buf_len=4M

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