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# xtrace xrand
000:<:0023: 4: Request(36): GrabServer
000:<:0024: 20: RANDR-Request(140,7): SetScreenSize window=0x00000228 width=5760 height=2160 width[mm]=1525 height[mm]=572
000:<:0025: 56: RANDR-Request(140,26): SetCrtcTransform crtc=0x0000003f transform={matrix=0.500000,0.000000,0.000000,0.000000,0.500000,0.000000,0.000000,0.000000,1.000000;}; filter name='bilinear' filter params=;
000:<:0026: 32: RANDR-Request(140,21): SetCrtcConfig crtc=0x0000003f timestamp=0x00000000 config timestamp=0x0003921a x=0 y=0 mode=0x00000048 rr=Rotate_0 outputs=0x00000042;
000:>:0025:Error 2=Value: major=140, minor=26, bad=63
000:>:0026:32: Reply to SetCrtcConfig: status=Success(0x00)
X Error of failed request: BadValue (integer parameter out of range for operation)
Major opcode of failed request: 140 (RANDR)
Minor opcode of failed request: 26 (RRSetCrtcTransform)
Value in failed request: 0x3f
Serial number of failed request: 37
Current serial number in output stream: 38
#grep nvidia /var/log/Xorg.0.log
[ 234.010] (**) |-->Screen "nvidia" (0)
[ 234.011] (**) | |-->Device "nvidia"
[ 234.011] (**) | |-->GPUDevice "nvidia"
[ 234.011] (==) No monitor specified for screen "nvidia".
[ 234.121] (II) LoadModule: "nvidia"
[ 234.121] (II) Loading /usr/lib/x86_64-linux-gnu/xorg/extra-modules/
[ 234.121] (II) Module nvidia: vendor="NVIDIA Corporation"
"nvidia" for depth/fbbpp 24/32
[ 235.166] (II) NVIDIA(0): [DRI2] VDPAU driver: nvidia
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