Re: port-arm/54342: Pinebook screen glitches/offsets on top and extreme right of the screen with modeset enabled

[Leonardo Taccari <leot%NetBSD.org@localhost>]

The following reply was made to PR port-arm/54342; it has been noted by GNATS.

From: Leonardo Taccari <leot%NetBSD.org@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: port-arm/54342: Pinebook screen glitches/offsets on top and extreme right of the screen with modeset enabled
Date: Fri, 05 Jul 2019 15:41:18 +0200

 Initial further analysis - thanks a lot to <jmcneill>!:
 
 Under X11, running xrandr(1):
 
  | % xrandr --verbose
  | Screen 0: minimum 320 x 200, current 1366 x 768, maximum 3840 x 2160
  | eDP-1 connected primary 1366x768+0+0 (0x43) normal (normal left inverted right x axis y axis) 309mm x 173mm
  | 	Identifier: 0x41
  | 	Timestamp:  463306
  | 	Subpixel:   unknown
  | 	Gamma:      1.0:1.1:1.2
  | 	Brightness: 1.0
  | 	Clones:    
  | 	CRTC:       0
  | 	CRTCs:      0
  | 	Transform:  1.000000 0.000000 0.000000
  | 	            0.000000 1.000000 0.000000
  | 	            0.000000 0.000000 1.000000
  | 	           filter: 
  | 	EDID: 
  | 		00ffffffffffff0009e5f30500000000
  | 		01170104951f1178025820925b579629
  | 		19505400000001010101010101010101
  | 		010101010101641b5677500013303020
  | 		360035ad1000001a7017568c50003e30
  | 		3020360035ad1000001a000000fe0056
  | 		34385431804842313436303100000000
  | 		00004101940010000009010a202000cd
  | 	CONNECTOR_ID: 22 
  | 		supported: 22
  | 	non-desktop: 0 
  | 		supported: 0, 1
  |   1366x768 (0x43) 70.120MHz +HSync -VSync *current +preferred
  |         h: width  1366 start 1414 end 1446 total 1485 skew    0 clock  47.22KHz
  |         v: height  768 start  771 end  777 total  787           clock  60.00Hz
  |   1366x768 (0x44) 60.000MHz +HSync -VSync
  |         h: width  1366 start 1414 end 1446 total 1506 skew    0 clock  39.84KHz
  |         v: height  768 start  771 end  777 total  830           clock  48.00Hz
 
 We can see that there are two modes and if we select the second one
 with:
 
  | % xrandr --output eDP-1 --mode 1366x768 --refresh 48
 
 In X11 there are no more offset problem or screen glitches!
 (if we set it back to the first one via `xrandr --output eDP-1 --mode
 1366x768 --refresh 60' the offset problems and screen glitches come
 back).