$ %  root@g2-pc  /h/jelte  gdb /usr/bin/ddccontrol                                                                                                                                                                                                di okt 28 20:53:49 CET 2014
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Reading symbols from /usr/bin/ddccontrol...Reading symbols from /usr/lib64/debug/usr/bin/ddccontrol.debug...done.
done.
(gdb) set args=-pv
Argument must be preceded by space.
(gdb) set args -pv
(gdb) run
Starting program: /usr/bin/ddccontrol -pv
warning: Could not load shared library symbols for linux-vdso.so.1.
Do you need "set solib-search-path" or "set sysroot"?
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
ddccontrol version 0.4.2
Copyright 2004-2005 Oleg I. Vdovikin (oleg@cs.msu.su)
Copyright 2004-2006 Nicolas Boichat (nicolas@boichat.ch)
This program comes with ABSOLUTELY NO WARRANTY.
You may redistribute copies of this program under the terms of the GNU General Public License.

ddcpci initing...
Starting /usr/bin/ddcpci 1 -1006197615 &...
Probing for available monitors...
radeon_open: mmap failed: Invalid argument
Found PCI device (pci:01:05.0-0)
Found PCI device (pci:01:05.0-1)
Found PCI device (pci:01:05.0-2)
Found PCI device (pci:01:05.0-3)
Device: pci:01:05.0-0
Error while reading write message answer: Bad message
Reading EDID 0x50 failed.
ddcci_open returned -2
Device: pci:01:05.0-1
Error while reading write message answer: Bad message
Reading EDID 0x50 failed.
ddcci_open returned -2
Device: pci:01:05.0-2
Error while reading write message answer: Bad message
Reading EDID 0x50 failed.
ddcci_open returned -2
Device: pci:01:05.0-3
Error while reading write message answer: Bad message
Reading EDID 0x50 failed.
ddcci_open returned -2
Found ADL display (adl:0:11)

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff78aceef in __memmove_sse2 (dest=<optimized out>, src=<optimized out>, len=<optimized out>) at ../string/memmove.c:85
85	      BYTE_COPY_FWD (dstp, srcp, len);
(gdb) backtrace full
#0  0x00007ffff78aceef in __memmove_sse2 (dest=<optimized out>, src=<optimized out>, len=<optimized out>) at ../string/memmove.c:85
        __x = 160 '\240'
        __nbytes = <optimized out>
        dstp = 0
        srcp = 140737488337201
#1  0x00007ffff4957c8a in ?? () from /usr/lib64/libatiadlxx.so
No symbol table info available.
#2  0x00007ffff493a45d in ADL2_Display_DDCBlockAccess_Get () from /usr/lib64/libatiadlxx.so
No symbol table info available.
#3  0x00007ffff493a5cf in ADL_Display_DDCBlockAccess_Get () from /usr/lib64/libatiadlxx.so
No symbol table info available.
#4  0x00007ffff7bd7b7a in amd_adl_i2c_write (adapter=0, display=11, addr=addr@entry=80, buf=buf@entry=0x7fffffffbc60 "", len=len@entry=1) at amd_adl.c:153
        res = <optimized out>
        rlen = 0
        wbuf = 0x7fffffffb930 "\240"
#5  0x00007ffff7bd0273 in i2c_write (mon=mon@entry=0x7fffffffbfa0, addr=addr@entry=80, buf=buf@entry=0x7fffffffbc60 "", len=len@entry=1 '\001') at ddcci.c:335
No locals.
#6  0x00007ffff7bd134c in ddcci_read_edid (mon=mon@entry=0x7fffffffbfa0, addr=addr@entry=80) at ddcci.c:857
        buf = "\000\000\000\000\000\000\000\000\210\310\377\377\377\177\000\000\300\355e\000\000\000\000\000\261\241\336\367\377\177\000\000\001", '\000' <repeats 15 times>, "\070\000\000\000\000\000\000\000Xݼ\367\377\177\000\000\240\277\377\377\377\177\000\000\300\355e\000\000\000\000\000\001\000\000\000\000\000\000\000u\b\337\367\377\177\000\000\002\000\000\000\000\000\000\000 ", '\000' <repeats 15 times>, "\v\000\000\000\000\000\000"
#7  0x00007ffff7bd197c in ddcci_open_with_addr (mon=mon@entry=0x7fffffffbfa0, filename=<optimized out>, filename@entry=0x65edc0 "adl:0:11", addr=addr@entry=55, edid=edid@entry=80, probing=probing@entry=1) at ddcci.c:979
No locals.
#8  0x00007ffff7bd1b0e in ddcci_open (mon=mon@entry=0x7fffffffbfa0, filename=filename@entry=0x65edc0 "adl:0:11", probing=probing@entry=1) at ddcci.c:1030
No locals.
#9  0x00007ffff7bd1c55 in ddcci_probe_device (filename=filename@entry=0x65edc0 "adl:0:11", current=current@entry=0x7fffffffc880, last=last@entry=0x7fffffffc888) at ddcci.c:1086
        mon = {fd = 0, addr = 55, adl_adapter = 0, adl_display = 11, pnpid = "\000\000\000\000\000\000\000", digital = 0 '\000', last = {tv_sec = 0, tv_usec = 0}, db = 0x0, caps = {vcp = {0x0 <repeats 256 times>}, type = unk, raw_caps = 0x0}, profiles = 0x0, 
          type = type_adl, probing = 1, fallback = 0}
        ret = <optimized out>
#10 0x00007ffff7bd21c3 in ddcci_probe () at ddcci.c:1224
        adapter = 0
        display = 11
        filename = 0x65edc0 "adl:0:11"
        list = 0x0
        current = 0x0
        last = 0x7fffffffc878
        dirp = <optimized out>
        direntp = <optimized out>
        adl_disp = 0
#11 0x00000000004019d9 in main (argc=2, argv=0x7fffffffdd08) at main.c:302
        monlist = <optimized out>
        current = <optimized out>
        i = <optimized out>
        retry = <optimized out>
        ret = <optimized out>
        mon = {fd = -1231028224, addr = 4294967295, adl_adapter = 0, adl_display = 0, pnpid = "\000\032\374\367\377\177\000", digital = 16 '\020', last = {tv_sec = 140737299951431, tv_usec = -1507852288}, db = 0xffffefbd58fe0000, caps = {vcp = {0x5, 0x7ffff7fc3a30, 
              0x7fffffffd510, 0x7ffff6f66f83, 0xffffffffa6800000, 0xffffefbd58fe0000, 0x7fffffffd438, 0x7fffffffd43a, 0x7ffff7df512d <memmove+397>, 0x7ffff6f66f6a, 0x7ffff7fc00e8, 0x1, 0x7fffffffdb50, 0x9, 0x7ffff7de8ecf <_dl_map_object_deps+2127>, 0x1000100010000, 
              0x1000100010001, 0x1000100010001, 0x7ffff7de0001 <dl_main+10369>, 0x7fff00000001, 0x7ffff7fc1a00, 0x0, 0xffffffffa7a00000, 0xffffefbd58fe0000, 0x7ffff7de88a6 <_dl_map_object_deps+550>, 0x2245200000000001, 0x7ffff7fc14f0, 0x7fffffffd450, 0x508a000000000000, 
              0xc201040000080110, 0x7ffff7de88a6 <_dl_map_object_deps+550>, 0x8a008e00000001, 0x7ffff7fc1000, 0x7fffffffd480, 0x7fffffffdaf8, 0x7fffffffdb50, 0x7ffff7de88a6 <_dl_map_object_deps+550>, 0x7fff00000001, 0x7ffff7fc2a48, 0x7fffffffd4b0, 
              0x7ffff7de8672 <openaux+50>, 0x7ffff74b7da8, 0x7ffff7de88a6 <_dl_map_object_deps+550>, 0x7ffff7ffab40, 0x0, 0x7ffff7ffd998 <_rtld_global+2456>, 0x7ffff7fc1a00, 0x0, 0x7ffff7fc1a00, 0x7ffff7ffab40, 0x0, 0x7fffffffdae0, 0x7fffffffdae0, 0x7fffffffdad8, 
              0x7fffffffdad7, 0x7fffffffd554, 0x7ffff74b7da8, 0xffffffffb6a00000, 0x1, 0x7ffff7fc34e8, 0x7fffffffd6e0, 0x7ffff72b5907, 0xffffffffaa200000, 0xffffefbd58fe0000, 0x3, 0x7ffff7fc3018, 0x7fffffffd6e0, 0x7ffff74d095a, 0xffffffffaa800000, 0xffffefbd58fe0000, 
              0x2, 0x7ffff7fc3018, 0x7fffffffd6e0, 0x7ffff74d0950, 0xffffffffaae00000, 0xffffefbd58fe0000, 0x1, 0x7ffff7fc3018, 0x7fffffffd6e0, 0x7ffff74d0941, 0x7ffff74b7f48, 0x7fffffffdb50, 0x7ffff7de898e <_dl_map_object_deps+782>, 0x1, 0x7ffff7fc24d0, 0x7fffffffd4e0, 
              0x400488000110298, 0x9e08288340000012, 0x7ffff7de88a6 <_dl_map_object_deps+550>, 0x1, 0x7ffff7fc2000, 0x7fffffffd650, 0x1f00000000, 0x2000000000, 0x7ffff7de88a6 <_dl_map_object_deps+550>, 0x2400000001, 0x7ffff7fc3a30, 0x7fffffffd680, 0x0, 0x7ffff7ffab40, 
              0x7ffff7de88a6 <_dl_map_object_deps+550>, 0x7ffff7ffab40, 0x7ffff7ffd998 <_rtld_global+2456>, 0x0, 0x7ffff7fc24d0, 0x7ffff7ffab40, 0x0, 0x7fffffffdae0, 0x7fffffffdad8, 0x7fffffffdad7, 0x7ffff7de8640 <openaux>, 0x7fffffffdaf8, 0x0, 0x7fffffffdae0, 
              0x7fffffffdae0, 0x7fffffffdad8, 0x7ffff7de4dfc <check_match+316>, 0x7fffffffd744, 0x2, 0x7ffff7828d58, 0xd, 0x9f051bc8, 0x7ffff7de577f <do_lookup_x+2335>, 0x7ffff7ffb160, 0x7fffffffd7d0, 0x7ffff7827834, 0x7ffff782deb8, 0x7fffffffd8e0, 0x7fffffffd8d0, 0x8, 
              0x7ffff7ffb1c0, 0x0, 0x7ffff7fc0fd0, 0x7ffff7ffab40, 0x7ffff6a1c08a, 0x7ffff7835d90, 0x7ffff7de4dfc <check_match+316>, 0x100000000, 0x2, 0x7ffff7828d58, 0xd, 0x7c96f087, 0x7ffff7de577f <do_lookup_x+2335>, 0x7fffffffd998, 0x7fffffffd870, 0x7ffff7828d28, 
              0x7ffff7835c70, 0x7fffffffd980, 0x7fffffffd970, 0x7fff00000007, 0x7d, 0x0, 0x7ffff7fc0bc8, 0x7ffff7ffab40, 0x7ffff7ddc774, 0x7ffff7835d90, 0x7ffff7ddc460, 0x100000000, 0x1000008a1, 0x7fffffffd8e0, 0x7ffff7fc0bc8, 0x7fffffffda10, 0x7ffff7ffe4a0, 
              0x7fffffffdad0, 0x7ffff7ffd998 <_rtld_global+2456>, 0x1, 0x7ffff7de4dfc <check_match+316>, 0x0, 0x2, 0x7ffff7828d58, 0xd, 0xb12fe117, 0x7ffff7de577f <do_lookup_x+2335>, 0x7ffff7ffe148, 0x7fffffffd960, 0x7ffff7826d34, 0x7ffff7829cb8, 0x7fffffffda70, 
              0x7fffffffda60, 0x7fff00000017, 0x7fffffffd970, 0x0, 0x7ffff7fbf180, 0x7ffff7ffab40, 0x7ffff5173f86, 0x7ffff7835d90, 0x7ffff5172428, 0x100000000, 0x1000000a4, 0x7ffff6a1d278, 0x7ffff7fbf180, 0x7fffffffdb00, 0x7ffff7de4dfc <check_match+316>, 0x7fffffffdb28, 
              0x2, 0x7ffff7828d58, 0xd, 0x2b43e9ed, 0x7ffff7de577f <do_lookup_x+2335>, 0x9463a6b9...}, type = (unknown: 4294958368), raw_caps = 0x7ffff78351c0 "\037("}, profiles = 0x7ffff7ffab40, type = type_adl, probing = 0, fallback = -136404559}
        fn = 0x0
        datadir = 0x0
        pnpname = 0x0
        dump = 0
        ctrl = -1
        value = -1
        caps = 0
        save = 0
        force = 0
        verbosity = 1
        probe = 1