[Bugme-new] [Bug 33832] New: mt352_read_register throws readreg error on bt878 dvb-t card (Nebula DigiTV)

bugzilla-daemon at bugzilla.kernel.org bugzilla-daemon at bugzilla.kernel.org
Fri Apr 22 07:39:42 PDT 2011


https://bugzilla.kernel.org/show_bug.cgi?id=33832

           Summary: mt352_read_register throws readreg error on bt878
                    dvb-t card (Nebula DigiTV)
           Product: v4l-dvb
           Version: unspecified
    Kernel Version: 2.6.38.3
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: dvb-core
        AssignedTo: v4l-dvb_dvb-core at kernel-bugs.osdl.org
        ReportedBy: juho.rutila+kernelbugs at gmail.com
        Regression: No


mt352 driver crashes in certain situations.

Here is the setup
01:00.0 VGA compatible controller: ATI Technologies Inc RV505 CE [Radeon X1550
64-bit]
04:00.0 Multimedia video controller: Brooktree Corporation Bt878 Video Capture
(rev 11)
04:00.1 Multimedia controller: Brooktree Corporation Bt878 Audio Capture (rev
11)

DVB-T card uses dvb_bt8xx driver. The error messages are
Apr 22 16:37:50 laika kernel: [  687.777413] mt352_read_register: readreg error
(reg=0, ret==-6)
Apr 22 16:37:50 laika kernel: [  687.778010] mt352_read_register: readreg error
(reg=20, ret==-6)
Apr 22 16:37:50 laika kernel: [  687.778607] mt352_read_register: readreg error
(reg=21, ret==-6)
Apr 22 16:37:50 laika kernel: [  687.779204] mt352_read_register: readreg error
(reg=9, ret==-6)
Apr 22 16:37:50 laika kernel: [  687.779801] mt352_read_register: readreg error
(reg=13, ret==-6)
Apr 22 16:37:50 laika kernel: [  687.780406] mt352_read_register: readreg error
(reg=14, ret==-6)
Apr 22 16:37:50 laika kernel: [  687.781003] mt352_read_register: readreg error
(reg=15, ret==-6)
Apr 22 16:37:50 laika kernel: [  687.781600] mt352_read_register: readreg error
(reg=16, ret==-6)
Apr 22 16:37:50 laika kernel: [  687.782197] mt352_read_register: readreg error
(reg=17, ret==-6)

Driver works fine for some time. Then when I turn my monitor (attached with dvi
to the ATI video card) on, mt352 driver crashes and starts to produce those
errors.

This problem sounds like a hardware problem, but I am filing this bug if there
is something that can be done in the software side. I have tried to switch PCI
and PCIe slots to no avail.

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