Bug 90122 - Not possible to change panels refresh rate
Summary: Not possible to change panels refresh rate
Status: CLOSED WONTFIX
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: unspecified
Hardware: Other All
: lowest enhancement
Assignee: Intel GFX Bugs mailing list
QA Contact: Intel GFX Bugs mailing list
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2015-04-21 06:03 UTC by dimon
Modified: 2017-07-24 22:47 UTC (History)
1 user (show)

See Also:
i915 platform: ALL
i915 features: display/eDP


Attachments

Description dimon 2015-04-21 06:03:38 UTC
> xrandr
Screen 0: minimum 8 x 8, current 1366 x 768, maximum 32767 x 32767
eDP1 connected 1366x768+0+0 (normal left inverted right x axis y axis) 293mm x 165mm
   1366x768      60.00 +  40.00* 
   1280x720      60.00  
   1024x768      60.00  
   1024x576      60.00  
   960x540       60.00  
   800x600       60.32    56.25  
   864x486       60.00  
   640x480       59.94  
   720x405       60.00  
   680x384       60.00  
   640x360       60.00  
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VGA1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

> vblank_mode=2 glxgears
Running synchronized to the vertical refresh.  The framerate should be
approximately the same as the monitor refresh rate.
301 frames in 5.0 seconds = 60.082 FPS
300 frames in 5.0 seconds = 60.000 FPS

1366x768 60/40 are native modes reported by the pannel.
Also adding a custom resolution with a custom refresh rate != 60HZ allways reports 60fps in glxgears
Comment 1 Ander Conselvan de Oliveira 2015-05-12 12:43:06 UTC
How do you attempt to change the refresh rate and what errors do you get?
Comment 2 dimon 2015-05-12 14:04:14 UTC
(In reply to Ander Conselvan de Oliveira from comment #1)
> How do you attempt to change the refresh rate and what errors do you get?

This is how I changed the refresh rate:
xrandr --output eDP1 --mode 1366x768 -r 40

I don't get any errors, but running glxgears with vblank_mode=2 reports a synchronized frame rate of 60 instead of 40.
Comment 3 Humberto Israel Perez Rodriguez 2015-08-11 16:35:16 UTC
Hi Ander Conselvan de Oliveira, could you please provide information to last comment.
Thanks
Comment 4 Jani Nikula 2015-08-18 14:50:29 UTC
Restricted to the panel preferred mode (fixed mode in code).
Comment 5 Jani Nikula 2016-04-21 12:51:19 UTC
I think it's fair to say we are not working on this. Sorry.


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