Hi Linux-xorg-specialists,
Psychtoolbox works
with the second monitor visible with DISPLAY=:0.1 and a single monitor
visible for xrandr. So, it is no Psychtoolbox-bug itself.
But, as reported in thread
Scrambled text if Zaphodheads; was: [PSYCHTOOLBOX] Re: Cannot end BitsPlusIdentityClutTest(1, 1)
I am not able to get a readable desktop. All text (menue bars, window titles, web pages in browser window) gets partially scrambled as if some letters are written on top of each other, see attachment.
Reason is "Zaphodheads" in xorg.conf (as suggested by XOrgConfCreate) *and* the forced usage of glamor.
Recently with older system (2014), I was able to switch off glamor in xorg.conf's Device sections with
Option "AccelMethod" "exa" # thanks to a hint of Mario
This doesn't work anymore, since Xorg.0.log shows:
[234.971] (WW) RADEON(0): EXA not supported, using glamor
Also if skipped, or
Option "AccelMethod" "none"
glamor is switched on :-(
[235.400] (II) RADEON(0): Use GLAMOR acceleration.
[235.400] (II) RADEON(0): Acceleration enabled
[235.448] (II) RADEON(1): Use GLAMOR acceleration.
[235.448] (II) RADEON(1): Acceleration enabled
Whenever I use the default (combined Screen over two monitors (DP & DVI)), all fonts look normal.
But Psychtoolbox then cannot use the second monitor.
* Does anybody know, how to switch off glamor?
* Or how to circumvent the text-scrambling?
Thanks for hints!
Best regards,
Uli
System Hardware:
AMD TAHITI 7790 (Southern Islands)
according to https://www.x.org/wiki/RadeonFeature/ supported
2 Monitors: DVI-0 (Viewpixx 1920x1200), DisplayPort-0 (Eizo LCD 1920x1200)
System Linux
Debian 8.7.1 (vanilla, Feb 2017) -or-
Kubuntu 2016.04-LTS -same-
# inxi -G
Graphics: Card: Advanced Micro Devices [AMD/ATI] Tahiti XT
[Radeon HD 7970/8970 OEM / R9 280X]
Display Server: X.org 1.16.4 drivers: ati,radeon
tty size: 193x57 Advanced Data: N/A for root
# uname -a
Linux 3.16.0-4-amd64 #1 SMP Debian 3.16.39-1+deb8u2 (2017-03-07) x86_64 GNU/Linux
$ xrandr -q
Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 16384 x 16384
DisplayPort-0 connected primary 1920x1200+0+0 (normal left inverted right x axis y axis) 519mm x 324mm
1920x1200 59.95*+
$ DISPLAY=:0.1 xrandr -q
Screen 1: minimum 320 x 200, current 1920 x 1200, maximum 16384 x 16384
DVI-0 connected 1920x1200+0+0 (normal left inverted right x axis y axis) 484mm x 302mm
1920x1200 100.00*+ 120.00 84.93 74.93 59.95
$ glxgears -info (same with DISPLAY=:0.1)
GL_RENDERER = Gallium 0.4 on AMD TAHITI
GL_VERSION = 3.0 Mesa 10.3.2
GL_VENDOR = X.Org
more info helpfull?
xorg.conf:
# Auto generated xorg.conf - Created by Psychtoolbox XOrgConfCreator.
Section "ServerLayout"
Identifier "PTB-Hydra"
Screen 0 "Screen0" 0 0
Screen 1 "Screen1" RightOf "Screen0"
EndSection
Section "Monitor"
Identifier "DisplayPort-0"
EndSection
Section "Monitor"
Identifier "DVI-0"
EndSection
Section "Device"
Identifier "Card0"
Driver "ati"
Option "ZaphodHeads" "DisplayPort-0"
Option "Monitor-DisplayPort-0" "DisplayPort-0"
Screen 0
Option "AccelMethod" "none" # no more "EXA"
EndSection
Section "Device"
Identifier "Card1"
Driver "ati"
Option "ZaphodHeads" "DVI-0"
Option "Monitor-DVI-0" "DVI-0"
Screen 1
Option "AccelMethod" "none" # no more "EXA"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Card0"
Monitor "DisplayPort-0"
EndSection
Section "Screen"
Identifier "Screen1"
Device "Card1"
Monitor "DVI-0"
EndSection
grep -i glamor Xorg.0.log
[3.314] (WW) RADEON(0): EXA not supported, using glamor
[3.314] (II) Loading sub module "glamoregl"
[3.314] (II) LoadModule: "glamoregl"
[3.314] (II) Loading /usr/lib/xorg/modules/libglamoregl.so
[3.321] (II) Module glamoregl: vendor="X.Org Foundation"
[3.321] (II) glamor: OpenGL accelerated X.org driver based.
[3.438] (II) glamor: EGL version 1.4 (DRI2):
[3.460] (II) RADEON(0): glamor detected, initialising EGL layer.
[3.635] (WW) RADEON(1): EXA not supported, using glamor
[3.635] (II) Loading sub module "glamoregl"
[3.635] (II) LoadModule: "glamoregl"
[3.635] (II) Loading /usr/lib/xorg/modules/libglamoregl.so
[3.635] (II) Module glamoregl: vendor="X.Org Foundation"
[3.635] (II) glamor: OpenGL accelerated X.org driver based.
[3.636] (II) glamor: EGL version 1.4 (DRI2):
[3.648] (II) RADEON(1): glamor detected, initialising EGL layer.
[3.845] (II) RADEON(0): Use GLAMOR acceleration.
[3.847] (II) RADEON(0): Set up textured video (glamor)
[3.847] (II) RADEON(0): [XvMC] Associated with GLAMOR Textured Video.
[3.973] (II) RADEON(1): Use GLAMOR acceleration.
[3.975] (II) RADEON(1): Set up textured video (glamor)
[3.975] (II) RADEON(1): [XvMC] Associated with GLAMOR Textured Video.