| Summary: | RV770 - screen flicker with radeon.dpm=1 | ||||||||||||||||||||
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| Product: | DRI | Reporter: | Vasco Almeida <vasquinhos13> | ||||||||||||||||||
| Component: | DRM/Radeon | Assignee: | Default DRI bug account <dri-devel> | ||||||||||||||||||
| Status: | RESOLVED FIXED | QA Contact: | |||||||||||||||||||
| Severity: | normal | ||||||||||||||||||||
| Priority: | medium | CC: | b.bellec | ||||||||||||||||||
| Version: | unspecified | ||||||||||||||||||||
| Hardware: | x86-64 (AMD64) | ||||||||||||||||||||
| OS: | Linux (All) | ||||||||||||||||||||
| Whiteboard: | |||||||||||||||||||||
| i915 platform: | i915 features: | ||||||||||||||||||||
| Attachments: |
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Description
Vasco Almeida
2013-12-27 13:31:42 UTC
Created attachment 91223 [details]
dmesg output
Created attachment 91224 [details]
glxinfo
Please attach your xorg log and the output of xrandr --verbose. Created attachment 91227 [details] [review] debugging patch Please attach your dmesg output with the attached patch applied to your kernel. Created attachment 91232 [details]
xrandr --verbose
Created attachment 91233 [details]
Xorg.log
Created attachment 91254 [details]
dmesg with patch
This is dmesg outpout with the patch attached above.
Created attachment 91611 [details] [review] add quirk Does the attached patch fix the issue? Yes, the attached patch fixed the flicker. Screen does not flick whichever value is power_dpm_state or power_dpm_force_performance_level. Before the patch, the flicker happened when switching from power level 2 sclk: 66500 mclk: 95000 vddc: 1082 to power level 1 sclk: 50000 mclk: 70000 vddc: 1046 In the way level 1 -> level 2 there is not screen flicker. (In reply to comment #9) > Yes, the attached patch fixed the flicker. Screen does not flick whichever > value is power_dpm_state or power_dpm_force_performance_level. > > Before the patch, the flicker happened when switching from > power level 2 sclk: 66500 mclk: 95000 vddc: 1082 > to > power level 1 sclk: 50000 mclk: 70000 vddc: 1046 > > In the way level 1 -> level 2 there is not screen flicker. The flicker is caused by the mclk transition. It some cases it seems to take longer than the vblank period which is why you are seeing the flicker. I found that my screen was flicking once in ~4 seconds because of conky. With conky off, flicks happen but happen a lot less, like 1 in ~20 - this period depends on what I'm doing. But testing with glxspheres, screen flicker happens each ~4 seconds again. Probably this isn't important. Can you give some hints about the solution? Do you think this can be fixed? Or this driver won't support mclk transition on this board? (In reply to comment #11) > I found that my screen was flicking once in ~4 seconds because of conky. > With conky off, flicks happen but happen a lot less, like 1 in ~20 - this > period depends on what I'm doing. But testing with glxspheres, screen > flicker happens each ~4 seconds again. Probably this isn't important. > It happens whenever there is an mclk transition based on GPU load. > Can you give some hints about the solution? Do you think this can be fixed? > Or this driver won't support mclk transition on this board? I'm not sure how reliable mclk switching was on rv770 boards in general. Most rv770 boards I've seen have the same mclk for all performance levels. You might try adjusting the value of CG_DISPLAY_GAP_CNTL in rv770_program_display_gap(). Maybe try R600_PM_DISPLAY_GAP_VBLANK_OR_WM or R600_PM_DISPLAY_GAP_WATERMARK rather than R600_PM_DISPLAY_GAP_VBLANK for DISP1_GAP_MCHG, but I don't think it will make a difference. Alex, I saw you disabled RV770 mclk switching to kernel 3.13.3 and 3.12.11. Thank you, it's now much more comfortable (tested with Fedora 19 kernel 3.12.11). Anyway, do you plan to add your patch to kernel 3.10 too? It's a long-term release and will be used by RHEL7. (In reply to comment #13) > Anyway, do you plan to add your patch to kernel 3.10 too? It's a long-term > release and will be used by RHEL7. Shame on me. DPM landed in kernel 3.11. |
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