| Summary: | blank screen at 4k@60Hz DP 1.2 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Product: | DRI | Reporter: | Alin M Elena <alinm.elena> | ||||||||
| Component: | DRM/Intel | Assignee: | Intel GFX Bugs mailing list <intel-gfx-bugs> | ||||||||
| Status: | CLOSED DUPLICATE | QA Contact: | Intel GFX Bugs mailing list <intel-gfx-bugs> | ||||||||
| Severity: | normal | ||||||||||
| Priority: | medium | CC: | davidesousa, intel-gfx-bugs, q3aiml, timur.alperovich | ||||||||
| Version: | XOrg git | ||||||||||
| Hardware: | Other | ||||||||||
| OS: | All | ||||||||||
| Whiteboard: | |||||||||||
| i915 platform: | SKL | i915 features: | display/DP | ||||||||
| Attachments: |
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Description
Alin M Elena
2016-02-03 10:00:00 UTC
there is no content in the error file when happens. Also the screen claims no video input. Alin Please add drm.debug=14 module parameter, and attach dmesg from boot to the problem. I presume DP MST. Created attachment 121489 [details]
log when live changing from dp1.1 to 1.2 and from 30Hz to60Hz
(In reply to Alin M Elena from comment #3) > Created attachment 121489 [details] > log when live changing from dp1.1 to 1.2 and from 30Hz to60Hz Your log starts 60 seconds after boot which means it lacks all the interesting bits from when the driver was loaded. You may need to increase the kernel log_buf_len= knob to catch it all. Anyways, there's an underrun after the modeset, and the clock is rather high, so I suspect this is due to cdclk being set too low. This can also be confirmed by: cat /sys/kernel/debug/dri/0/i915_frequency_info Created attachment 121504 [details]
attachment-9130-0.html
Sorry for that I will try to find the log in journalctl if not try again
tomorrow.
the cat output is here.
PM IER=0x00000070 IMR=0xffffff8f ISR=0x00000000 IIR=0x00000000,
MASK=0x00003fde
GT_PERF_STATUS: 0x00000000
Render p-state ratio: 0
Render p-state VID: 0
Render p-state limit: 255
RPSTAT1: 0x09008006
RPMODECTL: 0x00000d92
RPINCLIMIT: 0x00002c88
RPDECLIMIT: 0x00004fb0
RPNSWREQ: 300MHz
CAGF: 300MHz
RP CUR UP EI: 215us
RP CUR UP: 73us
RP PREV UP: 0us
Up threshold: 95%
RP CUR DOWN EI: 12613us
RP CUR DOWN: 74us
RP PREV DOWN: 0us
Down threshold: 85%
Lowest (RPN) frequency: 300MHz
Nominal (RP1) frequency: 300MHz
Max non-overclocked (RP0) frequency: 1050MHz
Max overclocked frequency: 1050MHz
Current freq: 300 MHz
Actual freq: 300 MHz
Idle freq: 300 MHz
Min freq: 300 MHz
Max freq: 1050 MHz
efficient (RPe) frequency: 300 MHz
Current CD clock frequency: 450000 kHz
Max CD clock frequency: 675000 kHz
Max pixel clock frequency: 675000 kHz
(In reply to Alin M Elena from comment #5) > Current CD clock frequency: 450000 kHz Yep, that's too low for you 4k@60 mode. We'd need to bump to 540 MHz at least. Unfortunately we don't support dynamic cdclk change on SKL yet. There are some patches in flight somewhere to get it done, but last time I looked it still needed more work. In the meantime we should really change things to report the current cdclk as the max cdclk when we don't actually support changing the cdclk, and we need to merge these [1] patches to filter out modes we can't drive. [1] http://patchwork.freedesktop.org/series/3009/ Created attachment 121527 [details] signature.asc Thanks for the update! So for the moment I shall keep and eye open. Alin On Thursday, 4 February 2016 17:13:53 GMT you wrote: > https://bugs.freedesktop.org/show_bug.cgi?id=93980 > > --- Comment #6 from Ville Syrjala <ville.syrjala@linux.intel.com> --- > (In reply to Alin M Elena from comment #5) > > > Current CD clock frequency: 450000 kHz > > Yep, that's too low for you 4k@60 mode. We'd need to bump to 540 MHz at > least. Unfortunately we don't support dynamic cdclk change on SKL yet. > There are some patches in flight somewhere to get it done, but last time I > looked it still needed more work. In the meantime we should really change > things to report the current cdclk as the max cdclk when we don't actually > support changing the cdclk, and we need to merge these [1] patches to > filter out modes we can't drive. > > [1] http://patchwork.freedesktop.org/series/3009/ Hello, I'm having the same issues also with a Dell 9350, so let me know if I can be of some help Please reopen if the problem persists with current drm-intel-nightly. *** This bug has been marked as a duplicate of bug 89055 *** I can confirm it's working at least in my hardware (Dell XPS 9350) Thanks for the follow-up. tested on two screens works with nightly from last night. Alin |
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