Also, unfortunately the problem isn't fixed by the cheaper call to XRRGetScreenResourcesCurrent
Other Xrandr calls are expensive, such as the "XRRGetScreenSizeRange" one made in gnome-desktop's gnome-rr.c This Xserver backtrace shows the issue: #0 0xb809e430 in __kernel_vsyscall () #1 0xb7ce7700 in __nanosleep_nocancel () from /lib/tls/i686/cmov/libc.so.6 #2 0xb7d24ffc in usleep () from /lib/tls/i686/cmov/libc.so.6 #3 0xb7ab826e in i830WaitForVblank (pScreen=0xa197040) at ../../src/i830_display.c:379 #4 0xb7abaf80 in i830_crtc_mode_set (crtc=0xa199b80, mode=0xbfdb9ea0, adjusted_mode=0xa4d70e8, x=0, y=0) at ../../src/i830_display.c:1511 #5 0x080ed08d in xf86CrtcSetModeTransform (crtc=0xa199b80, mode=0xbfdb9ea0, rotation=1, transform=0x0, x=0, y=0) at ../../../../hw/xfree86/modes/xf86Crtc.c:366 #6 0x080ed6d6 in xf86CrtcSetMode (crtc=0xa199b80, mode=0xbfdb9ea0, rotation=8180, x=0, y=0) at ../../../../hw/xfree86/modes/xf86Crtc.c:413 #7 0xb7ab956d in i830GetLoadDetectPipe (output=0xa19b618, mode=0xbfdb9ea0, dpms_mode=0xbfdb9f78) at ../../src/i830_display.c:1811 #8 0xb7ad746d in i830_tv_detect (output=0xa19b618) at ../../src/i830_tv.c:1376 #9 0x080eda90 in xf86ProbeOutputModes (scrn=0xa197040, maxX=4096, maxY=4096) at ../../../../hw/xfree86/modes/xf86Crtc.c:1500 #10 0x080f56c0 in xf86RandR12GetInfo12 (pScreen=0xa19c460, rotations=0xbfdba16a) at ../../../../hw/xfree86/modes/xf86RandR12.c:1255 #11 0x08162e89 in RRGetInfo (pScreen=0xa19c460) at ../../randr/rrinfo.c:196 #12 0x08167084 in ProcRRGetScreenSizeRange (client=0xa3d2208) at ../../randr/rrscreen.c:227 #13 0x0815f305 in ProcRRDispatch (client=0x0) at ../../randr/randr.c:473 #14 0x0808cdbf in Dispatch () at ../../dix/dispatch.c:437 #15 0x08071aad in main (argc=10, argv=0xbfdba324, envp=Cannot access memory at address 0x8 ) at ../../dix/main.c:383 -- upgrade to 2:1.2.99.2-0ubuntu1 makes session utterly slow https://bugs.launchpad.net/bugs/307306 You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-desktop in ubuntu. -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs